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Publisher: Springer-Verlag (Total: 2348 journals)

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Showing 1 - 200 of 2348 Journals sorted alphabetically
3D Printing in Medicine     Open Access   (Followers: 1)
3D Research     Hybrid Journal   (Followers: 21, SJR: 0.222, CiteScore: 1)
4OR: A Quarterly J. of Operations Research     Hybrid Journal   (Followers: 10, SJR: 0.825, CiteScore: 1)
AAPS J.     Hybrid Journal   (Followers: 22, SJR: 1.118, CiteScore: 4)
AAPS PharmSciTech     Hybrid Journal   (Followers: 7, SJR: 0.752, CiteScore: 3)
Abdominal Imaging     Hybrid Journal   (Followers: 15, SJR: 0.866, CiteScore: 2)
Abhandlungen aus dem Mathematischen Seminar der Universitat Hamburg     Hybrid Journal   (Followers: 4, SJR: 0.439, CiteScore: 0)
Academic Psychiatry     Full-text available via subscription   (Followers: 24, SJR: 0.53, CiteScore: 1)
Academic Questions     Hybrid Journal   (Followers: 8, SJR: 0.106, CiteScore: 0)
Accreditation and Quality Assurance: J. for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 26, SJR: 0.316, CiteScore: 1)
Acoustical Physics     Hybrid Journal   (Followers: 11, SJR: 0.359, CiteScore: 1)
Acoustics Australia     Hybrid Journal   (SJR: 0.232, CiteScore: 1)
Acta Analytica     Hybrid Journal   (Followers: 7, SJR: 0.367, CiteScore: 0)
Acta Applicandae Mathematicae     Hybrid Journal   (Followers: 1, SJR: 0.675, CiteScore: 1)
Acta Biotheoretica     Hybrid Journal   (Followers: 4, SJR: 0.284, CiteScore: 1)
Acta Diabetologica     Hybrid Journal   (Followers: 18, SJR: 1.587, CiteScore: 3)
Acta Endoscopica     Hybrid Journal   (Followers: 1)
acta ethologica     Hybrid Journal   (Followers: 4, SJR: 0.769, CiteScore: 1)
Acta Geochimica     Hybrid Journal   (Followers: 7, SJR: 0.24, CiteScore: 1)
Acta Geodaetica et Geophysica     Hybrid Journal   (Followers: 2, SJR: 0.305, CiteScore: 1)
Acta Geophysica     Hybrid Journal   (Followers: 10, SJR: 0.312, CiteScore: 1)
Acta Geotechnica     Hybrid Journal   (Followers: 7, SJR: 1.588, CiteScore: 3)
Acta Informatica     Hybrid Journal   (Followers: 5, SJR: 0.517, CiteScore: 1)
Acta Mathematica     Hybrid Journal   (Followers: 12, SJR: 7.066, CiteScore: 3)
Acta Mathematica Hungarica     Hybrid Journal   (Followers: 2, SJR: 0.452, CiteScore: 1)
Acta Mathematica Sinica, English Series     Hybrid Journal   (Followers: 6, SJR: 0.379, CiteScore: 1)
Acta Mathematica Vietnamica     Hybrid Journal   (SJR: 0.27, CiteScore: 0)
Acta Mathematicae Applicatae Sinica, English Series     Hybrid Journal   (SJR: 0.208, CiteScore: 0)
Acta Mechanica     Hybrid Journal   (Followers: 21, SJR: 1.04, CiteScore: 2)
Acta Mechanica Sinica     Hybrid Journal   (Followers: 5, SJR: 0.607, CiteScore: 2)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 7, SJR: 0.576, CiteScore: 2)
Acta Meteorologica Sinica     Hybrid Journal   (Followers: 3, SJR: 0.638, CiteScore: 1)
Acta Neurochirurgica     Hybrid Journal   (Followers: 6, SJR: 0.822, CiteScore: 2)
Acta Neurologica Belgica     Hybrid Journal   (Followers: 1, SJR: 0.376, CiteScore: 1)
Acta Neuropathologica     Hybrid Journal   (Followers: 5, SJR: 7.589, CiteScore: 12)
Acta Oceanologica Sinica     Hybrid Journal   (Followers: 3, SJR: 0.334, CiteScore: 1)
Acta Physiologiae Plantarum     Hybrid Journal   (Followers: 2, SJR: 0.574, CiteScore: 2)
Acta Politica     Hybrid Journal   (Followers: 14, SJR: 0.605, CiteScore: 1)
Activitas Nervosa Superior     Hybrid Journal   (SJR: 0.147, CiteScore: 0)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 7, SJR: 0.103, CiteScore: 0)
ADHD Attention Deficit and Hyperactivity Disorders     Hybrid Journal   (Followers: 23, SJR: 0.72, CiteScore: 2)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 9)
Administration and Policy in Mental Health and Mental Health Services Research     Partially Free   (Followers: 16, SJR: 1.005, CiteScore: 2)
Adsorption     Hybrid Journal   (Followers: 4, SJR: 0.703, CiteScore: 2)
Advances in Applied Clifford Algebras     Hybrid Journal   (Followers: 4, SJR: 0.698, CiteScore: 1)
Advances in Atmospheric Sciences     Hybrid Journal   (Followers: 37, SJR: 0.956, CiteScore: 2)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 19, SJR: 0.812, CiteScore: 1)
Advances in Contraception     Hybrid Journal   (Followers: 3)
Advances in Data Analysis and Classification     Hybrid Journal   (Followers: 52, SJR: 1.09, CiteScore: 1)
Advances in Gerontology     Partially Free   (Followers: 8, SJR: 0.144, CiteScore: 0)
Advances in Health Sciences Education     Hybrid Journal   (Followers: 28, SJR: 1.64, CiteScore: 2)
Advances in Manufacturing     Hybrid Journal   (Followers: 3, SJR: 0.475, CiteScore: 2)
Advances in Polymer Science     Hybrid Journal   (Followers: 44, SJR: 1.04, CiteScore: 3)
Advances in Therapy     Hybrid Journal   (Followers: 5, SJR: 1.075, CiteScore: 3)
Aegean Review of the Law of the Sea and Maritime Law     Hybrid Journal   (Followers: 6)
Aequationes Mathematicae     Hybrid Journal   (Followers: 2, SJR: 0.517, CiteScore: 1)
Aerobiologia     Hybrid Journal   (Followers: 3, SJR: 0.673, CiteScore: 2)
Aesthetic Plastic Surgery     Hybrid Journal   (Followers: 9, SJR: 0.825, CiteScore: 1)
African Archaeological Review     Hybrid Journal   (Followers: 16, SJR: 0.862, CiteScore: 1)
Afrika Matematika     Hybrid Journal   (Followers: 1, SJR: 0.235, CiteScore: 0)
AGE     Hybrid Journal   (Followers: 7)
Ageing Intl.     Hybrid Journal   (Followers: 7, SJR: 0.39, CiteScore: 1)
Aggiornamenti CIO     Hybrid Journal   (Followers: 1)
Aging Clinical and Experimental Research     Hybrid Journal   (Followers: 3, SJR: 0.67, CiteScore: 2)
Agricultural Research     Hybrid Journal   (Followers: 5, SJR: 0.276, CiteScore: 1)
Agriculture and Human Values     Hybrid Journal   (Followers: 14, SJR: 1.173, CiteScore: 3)
Agroforestry Systems     Hybrid Journal   (Followers: 20, SJR: 0.663, CiteScore: 1)
Agronomy for Sustainable Development     Hybrid Journal   (Followers: 12, SJR: 1.864, CiteScore: 6)
AI & Society     Hybrid Journal   (Followers: 8, SJR: 0.227, CiteScore: 1)
AIDS and Behavior     Hybrid Journal   (Followers: 14, SJR: 1.792, CiteScore: 3)
Air Quality, Atmosphere & Health     Hybrid Journal   (Followers: 4, SJR: 0.862, CiteScore: 3)
Akupunktur & Aurikulomedizin     Full-text available via subscription   (Followers: 1)
Algebra and Logic     Hybrid Journal   (Followers: 6, SJR: 0.531, CiteScore: 0)
Algebra Universalis     Hybrid Journal   (Followers: 2, SJR: 0.583, CiteScore: 1)
Algebras and Representation Theory     Hybrid Journal   (Followers: 1, SJR: 1.095, CiteScore: 1)
Algorithmica     Hybrid Journal   (Followers: 9, SJR: 0.56, CiteScore: 1)
Allergo J.     Full-text available via subscription   (Followers: 1, SJR: 0.234, CiteScore: 0)
Allergo J. Intl.     Hybrid Journal   (Followers: 2)
Alpine Botany     Hybrid Journal   (Followers: 5, SJR: 1.11, CiteScore: 3)
ALTEX : Alternatives to Animal Experimentation     Open Access   (Followers: 3)
AMBIO     Hybrid Journal   (Followers: 10, SJR: 1.569, CiteScore: 4)
American J. of Cardiovascular Drugs     Hybrid Journal   (Followers: 16, SJR: 0.951, CiteScore: 3)
American J. of Community Psychology     Hybrid Journal   (Followers: 28, SJR: 1.329, CiteScore: 2)
American J. of Criminal Justice     Hybrid Journal   (Followers: 7, SJR: 0.772, CiteScore: 1)
American J. of Cultural Sociology     Hybrid Journal   (Followers: 16, SJR: 0.46, CiteScore: 1)
American J. of Dance Therapy     Hybrid Journal   (Followers: 4, SJR: 0.181, CiteScore: 0)
American J. of Potato Research     Hybrid Journal   (Followers: 2, SJR: 0.611, CiteScore: 1)
American J. of Psychoanalysis     Hybrid Journal   (Followers: 21, SJR: 0.314, CiteScore: 0)
American Sociologist     Hybrid Journal   (Followers: 12, SJR: 0.35, CiteScore: 0)
Amino Acids     Hybrid Journal   (Followers: 8, SJR: 1.135, CiteScore: 3)
AMS Review     Partially Free   (Followers: 4)
Analog Integrated Circuits and Signal Processing     Hybrid Journal   (Followers: 7, SJR: 0.211, CiteScore: 1)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 5, SJR: 0.536, CiteScore: 1)
Analysis in Theory and Applications     Hybrid Journal   (Followers: 1)
Analysis of Verbal Behavior     Hybrid Journal   (Followers: 5)
Analytical and Bioanalytical Chemistry     Hybrid Journal   (Followers: 32, SJR: 0.978, CiteScore: 3)
Anatomical Science Intl.     Hybrid Journal   (Followers: 2, SJR: 0.367, CiteScore: 1)
Angewandte Schmerztherapie und Palliativmedizin     Hybrid Journal  
Angiogenesis     Hybrid Journal   (Followers: 3, SJR: 2.177, CiteScore: 5)
Animal Cognition     Hybrid Journal   (Followers: 19, SJR: 1.389, CiteScore: 3)
Annales françaises de médecine d'urgence     Hybrid Journal   (Followers: 1, SJR: 0.192, CiteScore: 0)
Annales Henri Poincaré     Hybrid Journal   (Followers: 3, SJR: 1.097, CiteScore: 2)
Annales mathématiques du Québec     Hybrid Journal   (Followers: 4, SJR: 0.438, CiteScore: 0)
Annali dell'Universita di Ferrara     Hybrid Journal   (SJR: 0.429, CiteScore: 0)
Annali di Matematica Pura ed Applicata     Hybrid Journal   (Followers: 1, SJR: 1.197, CiteScore: 1)
Annals of Biomedical Engineering     Hybrid Journal   (Followers: 18, SJR: 1.042, CiteScore: 3)
Annals of Combinatorics     Hybrid Journal   (Followers: 4, SJR: 0.932, CiteScore: 1)
Annals of Data Science     Hybrid Journal   (Followers: 12)
Annals of Dyslexia     Hybrid Journal   (Followers: 10, SJR: 0.85, CiteScore: 2)
Annals of Finance     Hybrid Journal   (Followers: 30, SJR: 0.579, CiteScore: 1)
Annals of Forest Science     Hybrid Journal   (Followers: 7, SJR: 0.986, CiteScore: 2)
Annals of Global Analysis and Geometry     Hybrid Journal   (Followers: 1, SJR: 1.228, CiteScore: 1)
Annals of Hematology     Hybrid Journal   (Followers: 15, SJR: 1.043, CiteScore: 2)
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 12, SJR: 0.413, CiteScore: 1)
Annals of Microbiology     Hybrid Journal   (Followers: 11, SJR: 0.479, CiteScore: 2)
Annals of Nuclear Medicine     Hybrid Journal   (Followers: 4, SJR: 0.687, CiteScore: 2)
Annals of Operations Research     Hybrid Journal   (Followers: 10, SJR: 0.943, CiteScore: 2)
Annals of Ophthalmology     Hybrid Journal   (Followers: 11)
Annals of Regional Science     Hybrid Journal   (Followers: 7, SJR: 0.614, CiteScore: 1)
Annals of Software Engineering     Hybrid Journal   (Followers: 13)
Annals of Solid and Structural Mechanics     Hybrid Journal   (Followers: 9, SJR: 0.239, CiteScore: 1)
Annals of Surgical Oncology     Hybrid Journal   (Followers: 13, SJR: 1.986, CiteScore: 4)
Annals of Telecommunications     Hybrid Journal   (Followers: 9, SJR: 0.223, CiteScore: 1)
Annals of the Institute of Statistical Mathematics     Hybrid Journal   (Followers: 1, SJR: 1.495, CiteScore: 1)
Antonie van Leeuwenhoek     Hybrid Journal   (Followers: 5, SJR: 0.834, CiteScore: 2)
Apidologie     Hybrid Journal   (Followers: 4, SJR: 1.22, CiteScore: 3)
APOPTOSIS     Hybrid Journal   (Followers: 8, SJR: 1.424, CiteScore: 4)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2, SJR: 0.294, CiteScore: 1)
Applications of Mathematics     Hybrid Journal   (Followers: 2, SJR: 0.602, CiteScore: 1)
Applied Biochemistry and Biotechnology     Hybrid Journal   (Followers: 43, SJR: 0.571, CiteScore: 2)
Applied Biochemistry and Microbiology     Hybrid Journal   (Followers: 17, SJR: 0.21, CiteScore: 1)
Applied Cancer Research     Open Access  
Applied Categorical Structures     Hybrid Journal   (Followers: 2, SJR: 0.49, CiteScore: 0)
Applied Composite Materials     Hybrid Journal   (Followers: 49, SJR: 0.58, CiteScore: 2)
Applied Entomology and Zoology     Partially Free   (Followers: 4, SJR: 0.422, CiteScore: 1)
Applied Geomatics     Hybrid Journal   (Followers: 3, SJR: 0.733, CiteScore: 3)
Applied Geophysics     Hybrid Journal   (Followers: 8, SJR: 0.488, CiteScore: 1)
Applied Intelligence     Hybrid Journal   (Followers: 12, SJR: 0.6, CiteScore: 2)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 4, SJR: 0.319, CiteScore: 1)
Applied Mathematics & Optimization     Hybrid Journal   (Followers: 6, SJR: 0.886, CiteScore: 1)
Applied Mathematics - A J. of Chinese Universities     Hybrid Journal   (SJR: 0.17, CiteScore: 0)
Applied Mathematics and Mechanics     Hybrid Journal   (Followers: 5, SJR: 0.461, CiteScore: 1)
Applied Microbiology and Biotechnology     Hybrid Journal   (Followers: 64, SJR: 1.182, CiteScore: 4)
Applied Physics A     Hybrid Journal   (Followers: 9, SJR: 0.481, CiteScore: 2)
Applied Physics B: Lasers and Optics     Hybrid Journal   (Followers: 24, SJR: 0.74, CiteScore: 2)
Applied Psychophysiology and Biofeedback     Hybrid Journal   (Followers: 8, SJR: 0.519, CiteScore: 2)
Applied Research in Quality of Life     Hybrid Journal   (Followers: 12, SJR: 0.316, CiteScore: 1)
Applied Solar Energy     Hybrid Journal   (Followers: 18, SJR: 0.225, CiteScore: 0)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 5, SJR: 0.542, CiteScore: 1)
Aquaculture Intl.     Hybrid Journal   (Followers: 23, SJR: 0.591, CiteScore: 2)
Aquarium Sciences and Conservation     Hybrid Journal   (Followers: 1)
Aquatic Ecology     Hybrid Journal   (Followers: 34, SJR: 0.656, CiteScore: 2)
Aquatic Geochemistry     Hybrid Journal   (Followers: 4, SJR: 0.591, CiteScore: 1)
Aquatic Sciences     Hybrid Journal   (Followers: 13, SJR: 1.109, CiteScore: 3)
Arabian J. for Science and Engineering     Hybrid Journal   (Followers: 5, SJR: 0.303, CiteScore: 1)
Arabian J. of Geosciences     Hybrid Journal   (Followers: 2, SJR: 0.319, CiteScore: 1)
Archaeological and Anthropological Sciences     Hybrid Journal   (Followers: 20, SJR: 1.052, CiteScore: 2)
Archaeologies     Hybrid Journal   (Followers: 12, SJR: 0.224, CiteScore: 0)
Archiv der Mathematik     Hybrid Journal   (Followers: 1, SJR: 0.725, CiteScore: 1)
Archival Science     Hybrid Journal   (Followers: 60, SJR: 0.745, CiteScore: 2)
Archive for History of Exact Sciences     Hybrid Journal   (Followers: 7, SJR: 0.186, CiteScore: 1)
Archive for Mathematical Logic     Hybrid Journal   (Followers: 3, SJR: 0.909, CiteScore: 1)
Archive for Rational Mechanics and Analysis     Hybrid Journal   (SJR: 3.93, CiteScore: 3)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 5, SJR: 0.79, CiteScore: 2)
Archives and Museum Informatics     Hybrid Journal   (Followers: 142, SJR: 0.101, CiteScore: 0)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 5, SJR: 1.41, CiteScore: 5)
Archives of Dermatological Research     Hybrid Journal   (Followers: 7, SJR: 1.006, CiteScore: 2)
Archives of Environmental Contamination and Toxicology     Hybrid Journal   (Followers: 14, SJR: 0.773, CiteScore: 2)
Archives of Gynecology and Obstetrics     Hybrid Journal   (Followers: 16, SJR: 0.956, CiteScore: 2)
Archives of Microbiology     Hybrid Journal   (Followers: 8, SJR: 0.644, CiteScore: 2)
Archives of Orthopaedic and Trauma Surgery     Hybrid Journal   (Followers: 8, SJR: 1.146, CiteScore: 2)
Archives of Osteoporosis     Hybrid Journal   (Followers: 2, SJR: 0.71, CiteScore: 2)
Archives of Sexual Behavior     Hybrid Journal   (Followers: 10, SJR: 1.493, CiteScore: 3)
Archives of Toxicology     Hybrid Journal   (Followers: 17, SJR: 1.541, CiteScore: 5)
Archives of Virology     Hybrid Journal   (Followers: 5, SJR: 0.973, CiteScore: 2)
Archives of Women's Mental Health     Hybrid Journal   (Followers: 14, SJR: 1.274, CiteScore: 3)
Archivio di Ortopedia e Reumatologia     Hybrid Journal  
Archivum Immunologiae et Therapiae Experimentalis     Hybrid Journal   (Followers: 2, SJR: 0.946, CiteScore: 3)
ArgoSpine News & J.     Hybrid Journal  
Argumentation     Hybrid Journal   (Followers: 5, SJR: 0.349, CiteScore: 1)
Arid Ecosystems     Hybrid Journal   (Followers: 2, SJR: 0.2, CiteScore: 0)
Arkiv för Matematik     Hybrid Journal   (Followers: 1, SJR: 0.766, CiteScore: 1)
Arnold Mathematical J.     Hybrid Journal   (Followers: 1, SJR: 0.355, CiteScore: 0)
Arthropod-Plant Interactions     Hybrid Journal   (Followers: 2, SJR: 0.839, CiteScore: 2)
Arthroskopie     Hybrid Journal   (Followers: 1, SJR: 0.131, CiteScore: 0)
Artificial Intelligence and Law     Hybrid Journal   (Followers: 11, SJR: 0.937, CiteScore: 2)
Artificial Intelligence Review     Hybrid Journal   (Followers: 15, SJR: 0.833, CiteScore: 4)
Artificial Life and Robotics     Hybrid Journal   (Followers: 9, SJR: 0.226, CiteScore: 0)
Asia Europe J.     Hybrid Journal   (Followers: 5, SJR: 0.504, CiteScore: 1)
Asia Pacific Education Review     Hybrid Journal   (Followers: 12, SJR: 0.479, CiteScore: 1)
Asia Pacific J. of Management     Hybrid Journal   (Followers: 16, SJR: 1.185, CiteScore: 2)
Asia-Pacific Education Researcher     Hybrid Journal   (Followers: 12, SJR: 0.353, CiteScore: 1)
Asia-Pacific Financial Markets     Hybrid Journal   (Followers: 2, SJR: 0.187, CiteScore: 0)
Asia-Pacific J. of Atmospheric Sciences     Hybrid Journal   (Followers: 19, SJR: 0.855, CiteScore: 1)
Asian Business & Management     Hybrid Journal   (Followers: 9, SJR: 0.378, CiteScore: 1)
Asian J. of Business Ethics     Hybrid Journal   (Followers: 9)
Asian J. of Criminology     Hybrid Journal   (Followers: 5, SJR: 0.543, CiteScore: 1)
AStA Advances in Statistical Analysis     Hybrid Journal   (Followers: 3, SJR: 0.548, CiteScore: 1)
AStA Wirtschafts- und Sozialstatistisches Archiv     Hybrid Journal   (Followers: 5, SJR: 0.183, CiteScore: 0)
ästhetische dermatologie & kosmetologie     Full-text available via subscription  

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Journal Cover
Analog Integrated Circuits and Signal Processing
Journal Prestige (SJR): 0.211
Citation Impact (citeScore): 1
Number of Followers: 7  
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1573-1979 - ISSN (Online) 0925-1030
Published by Springer-Verlag Homepage  [2348 journals]
  • A new adaptive bandwidth, adaptive jitter frequency synthesizer using
           programmable charge pump circuit
    • Authors: Hamidreza Esmaeili Taheri; Mehdi Ehsanian
      Pages: 373 - 384
      Abstract: A new adaptive bandwidth, adaptive jitter frequency synthesizer is proposed. This synthesizer is designed in such a way that the ratio of bandwidth to the reference frequency is kept approximately fixed in order to maintain the optimum jitter performance. The proposed structure employs a novel programmable charge pump and a charge pump controller circuit. Regarding the control voltage of the LC voltage controlled oscillator (VCO), the charge pump controller determines the output sink/source current of the charge pump and maintains the ratio of the charge pump current to the VCO oscillation frequency fixed. It is shown that using this idea and proposed building blocks, variations of the desired ratio of the bandwidth to the reference frequency are canceled and thus, the optimum output jitter manner of the frequency synthesizer is preserved. The proposed structure is simulated in 0.18 µm CMOS technology and simulation results are presented and discussed.
      PubDate: 2018-09-01
      DOI: 10.1007/s10470-018-1228-z
      Issue No: Vol. 96, No. 3 (2018)
  • A high-Q floating active inductor using 130 nm BiCMOS technology and its
           application in IF band pass filter
    • Authors: Divyesh Sachan; Manish Goswami; Prasanna Kumar Misra
      Pages: 385 - 393
      Abstract: In this work, the performance of floating active inductor is studied using 130 nm BiCMOS technology. A new design of floating type active inductor based on gyrator-C topology using MOSFETs and npn SiGe HBTs has been proposed. The quality factor, power consumption, noise figure, S11 and inductance value of the proposed design have been obtained and results are compared. The tradeoff between design parameters are discussed and optimal values of design components are found. The maximum value of quality factor obtained is 300 with inductive bandwidth of 0.32–2.65 GHz and power consumption of 269 µW. The design was also used in IF band pass filter for receiver applications and performance is studied in terms of gain, 1 dB compression point and IIP3. From the study, it has been observed that proposed floating type active inductor can be used in high performance RF applications compared to the applications that uses passive inductor.
      PubDate: 2018-09-01
      DOI: 10.1007/s10470-018-1196-3
      Issue No: Vol. 96, No. 3 (2018)
  • Concurrent dual-band Doherty power amplifier using a novel dual-band
           bandpass filter for wireless technologies
    • Authors: Shaban Rezaei Borjlu; Massoud Dousti; Davud Asemani
      Pages: 395 - 408
      Abstract: This paper proposes a novel design methodology for dual-band Doherty power amplifier (DPA) with a novel dual-band bandpass filter and quad-section stepped impedance resonators. This design rejects the annoying frequencies of the second and third harmonics in the dual-band and contributes greatly to efficiency improvement of DPA. The methodology is validated with the design, simulation, implementation and experimentation of a 10 W GaN-based DPA for global system for mobile communications and worldwide interoperability for microwave access (WiMAX) applications at 1.84 GHz and 3.5 GHz, respectively. In the measurement results, the DPA achieves a drain efficiency (DE) of 55.5% with an output power of 38.2 dBm and power gain is 16.2 dB at the 6.1 dB output power back-off (OBO) from a saturated output power at 1.84 GHz. Furthermore, the DPA achieves a DE of 46.2% with an output power of 36.15 dBm, and power gain is 10 dB at the 6.1 dB OBO at 3.5 GHz. Using a10-MHz 16-QAM signal at 1.84 GHz and a 5-MHz WiMAX signal at 3.5 GHz, the linearity results show an adjacent channel leakage ratio of − 46.9 and − 44.3 dBc with the average output power of 37.6 and 36.1 dBm at 1.84 and 3.5 GHz, respectively.
      PubDate: 2018-09-01
      DOI: 10.1007/s10470-018-1187-4
      Issue No: Vol. 96, No. 3 (2018)
  • Design of multi-threshold threshold gate using MOS-NDR circuits suitable
           for CMOS process
    • Authors: Kwang-Jow Gan; Chien-Hsiung Huang; Wen-Kuan Yeh; Chun-Yi Guo; Jeng-Jong Lu
      Pages: 409 - 416
      Abstract: We demonstrate a multi-threshold threshold gate (MTTG) based on a series and parallel connection of several MOS-NDR circuits. A MOS-NDR circuit is made of five standard Si-based metal–oxide–semiconductor field-effect-transistor (MOS) devices. It can show the negative-differential-resistance (NDR) characteristic in its current–voltage (I–V) curve by adjusting suitable parameters for the MOS transistors. The operation principle of this MTTG is based on the monostable-bistable transition logic element (MOBILE), which the output voltage goes to the low or high state depending on the relative current-peak conditions of the series-connected NDR circuits by supplying a clocked voltage. The weight of this MTTG is defined by the gate width of the MOS device in the MOS-NDR circuit. It is different from the design using the area of the resonant tunneling diode as the weight in the other NDR-based MTTG circuit. A great advantage of this MOS-NDR-based MTTG is that we can design the application using the standard CMOS technology without the need of compound semiconductor.
      PubDate: 2018-09-01
      DOI: 10.1007/s10470-018-1156-y
      Issue No: Vol. 96, No. 3 (2018)
  • Floating incremental/decremental flux-controlled memristor emulator
           circuit based on single VDTA
    • Authors: Predrag B. Petrović
      Pages: 417 - 433
      Abstract: In this paper, new analog emulator circuits of flux-controlled memristor based on current voltage differencing transconductance amplifier (VDTA) and passive elements are proposed. They emulate both types of memductance, incremental and decremental, solely by interchanging the VDTA output terminals controlled by a simple switch. It uses only one VDTA, two resistors, one capacitor and one multiplier emulating floating memductance. Compared to other designed emulator circuits, they consist of fewer CMOS transistors and have wider output ranges. Theoretical derivations and related results are validated using SPICE simulations. The effectiveness of the proposed memristor circuits is verified by experimental results using commercially available integrated circuits, showing close agreement with theoretical and simulation results and easily reproducible at a low cost. The simulation test results and use of 0.18 μm CMOS technology have shown that the maximum frequency is 2 MHz. The circuit has also been tested for non-volatility features.The application of the proposed floating memristor emulator in designing an FM-to-AM converter confirms the functionality of the proposed circuit.
      PubDate: 2018-09-01
      DOI: 10.1007/s10470-018-1177-6
      Issue No: Vol. 96, No. 3 (2018)
  • 56.67 fJ/bit single-ended disturb-free 5T loadless 4 kb SRAM using 90 nm
           CMOS technology
    • Authors: Chua-Chin Wang; Deng-Shain Wang; Sih-Yu Chen
      Pages: 435 - 443
      Abstract: A novel single-ended SRAM is proposed in this study, where the built-in self-refleshing data retention path has been utilized to reduce the SRAM cell area. In order to reduce the power-delay product, an analytical solution to derive the optimal number of the 5T cells on the BLB is reported in this paper. The proposed SRAM is implement by TSMC 90 nm CMOS technology. According to the measurement results, the energy dissipation per write/read operation is found to be 0.479/0.091 fJ provided that the SRAM cells is supplied a 0.6 V VDD supply.
      PubDate: 2018-09-01
      DOI: 10.1007/s10470-018-1186-5
      Issue No: Vol. 96, No. 3 (2018)
  • An anti-boundary switching fine-resolution digital delay-locked loop
    • Authors: Jongsun Kim
      Pages: 445 - 454
      Abstract: This paper presents a new anti-boundary switching fine-resolution digital delay-locked loop (DLL) for high speed memory systems. The proposed digital DLL uses a new phase-interpolator (PI)-based digitally controlled delay line structure with overlapping period to eliminate the boundary switching problem in conventional digital DLLs, achieving high delay resolution and low jitter characteristics. In addition, by applying the phase inversion scheme and the variable successive approximation register algorithm, the proposed digital DLL achieves a fast locking time of less than 114 cycles and has a wide operating frequency range of 125 MHz–2.7 GHz without producing any harmonic lock problem. Fabricated in a 0.13-µm CMOS process, the proposed digital DLL achieves a fine delay resolution of around 2.0 ps and the measured peak-to-peak output clock jitter is only 8.75 ps at 2.7 GHz. The proposed digital DLL occupies an active area of only 0.05 mm2 and dissipates 8.6 mW of power from a 1.2 V supply at 2.0 GHz.
      PubDate: 2018-09-01
      DOI: 10.1007/s10470-018-1206-5
      Issue No: Vol. 96, No. 3 (2018)
  • A novel Schmitt trigger and its application using a single four terminal
           floating nullor (FTFN)
    • Authors: Ashish Ranjan; Harika Pamu; Huirem Tarunkumar
      Pages: 455 - 467
      Abstract: In this research paper, a simple clock wise and counter clock wise Schmitt trigger employing single four terminal floating nullor (FTFN) with two external resistors is presented. The proposed Schmitt trigger avails CMOS based FTFN and it is extended for the application as a square and triangular wave generator, by adding an external capacitor to it. In addition, the proposed waveform generator provides independent tunability of amplitude of square wave by implementing the passive resistors using MOS transistors which make the circuit to be integrated fully. Finally, the verification of the proposed design is verified using PSPICE to justify the theoretical analysis. Also, post layout simulation and the experimental verification using commercially available current feedback operational amplifier named as ICAD844 based implementation for FTFN are included to confirm the reliability of the circuit.
      PubDate: 2018-09-01
      DOI: 10.1007/s10470-018-1229-y
      Issue No: Vol. 96, No. 3 (2018)
  • Design of X band parallel coupled line BPF by analytical approach
    • Authors: B. G. Gopal; V. Rajamani
      Pages: 469 - 474
      Abstract: The design of maximally flat band pass filter for 10 GHz center frequency with 500 MHz bandwidth for X band applications is presented in this paper. An analytical approach is discussed here along with design using EDA tool. The simulated and measured values of various parameters such as insertion loss − 1.3 dB, return loss − 22.65 dB, group delay 1.35 nS and VSWR 1.16 are compared. The measured values insertion loss − 1.3 dB, return loss − 22.65 dB, group delay 1.35 nS and VSWR 1.16 offers a very good filter response. It gives slight compromising results. The physical dimensions of the micro strip filter structure are tuned manually for better result after the analytical calculations of the dimensions. It gives clear picture that the length of the micro strip lines has major role in shifting the pass band, width and space between the lines plays a conformal contribution in varying the bandwidth, attenuation levels. The filter is matched to 50 Ω micro strip lines at both ends.
      PubDate: 2018-09-01
      DOI: 10.1007/s10470-018-1134-4
      Issue No: Vol. 96, No. 3 (2018)
  • On the minimal time for the process of analog circuit optimization
    • Authors: Alexander Zemliak
      Pages: 475 - 483
      Abstract: The process of analogue circuit optimization is mathematically defined as a controllable dynamic system. In this context the minimization of the processor time of designing can be formulated as a problem of time minimization for transitional process of dynamic system. A special control vector that changes the internal structure of the equations of optimization procedure serves as a principal tool for searching the best strategies with the minimal CPU time. In this case a well-known maximum principle of Pontryagin is the best theoretical approach for finding of the optimum structure of control vector. Practical approach for realization of the maximum principle is based on the analysis of behavior of a Hamiltonian for various strategies of optimization. The possibility of applying the maximum principle to the problem of optimization of electronic circuits is analyzed. It is shown that in spite of the fact that the problem of optimization is formulated as a nonlinear task, and the maximum principle in this case isn’t a sufficient condition for obtaining a minimum of the functional, it is possible to obtain the decision in the form of local minima. The relative acceleration of the CPU time for the best strategy found by means of maximum principle compared with the traditional approach is equal two to three orders of magnitude.
      PubDate: 2018-09-01
      DOI: 10.1007/s10470-018-1135-3
      Issue No: Vol. 96, No. 3 (2018)
  • Implementation and Simulation of Fractional Order Chaotic Circuits with
    • Authors: Ozkan Atan
      Pages: 485 - 494
      Abstract: The potential application of nonlinear systems and time delay, has a resulted in increasing attention to such systems. In this paper, we designed numerical and circuit models for synchronisation of fractional-order chaotic systems with time delay. Also two fractional order Sprott chaotic systems with time delay is used systems, and, the control circuit is designed for synchronization of the chaotic systems. To provide time delay, all pass filter circuit model has been used. Global stability for the synchronisation is defined according to Lyapunov stability criteria and according to the stability method, the input range is determined to make the system stable. The paper is presented numerical solution of fractional order systems with time delay and designed the circuit model of the system. For different time delay values, the changes in the errors of synchronisation were examined. Finally the results of numerical simulations were compared with the results of circuit analysis to verify the theoretical analysis.
      PubDate: 2018-09-01
      DOI: 10.1007/s10470-018-1189-2
      Issue No: Vol. 96, No. 3 (2018)
  • Analysis of switched-capacitor circuits using driving-point signal-flow
    • Authors: Hanspeter Schmid; Alex Huber
      Pages: 495 - 507
      Abstract: This paper extends the driving-point signal-flow graphs to switched-capacitor (SC) circuits by introducing a new theoretical element: an auxiliary voltage source that transfers no charge. In contrast to existing SFG methods, our method has no restrictions as to what types of SC circuits can be analysed, it requires no equivalent circuits or tables, and it works with two-phase as well as multi-phase SC circuits of any complexity. Compared to charge-equation matrix methods, it requires more effort, but is better suited for hand analysis because it makes causal relationships visible. Three illustrative examples are given to show the efficiency of the method and present a few application hints: a voltage doubler, the standard SC integrator, and a four-phase circuit simulating an inductor.
      PubDate: 2018-09-01
      DOI: 10.1007/s10470-018-1131-7
      Issue No: Vol. 96, No. 3 (2018)
  • SC amplifier and SC integrator with enhanced immunity to capacitor
    • Authors: Chi-Chang Lu; Hou-Ming Chen
      Pages: 509 - 519
      Abstract: Novel switched-capacitor amplifier and integrator with enhanced immunity to capacitor mismatch are presented. Both circuits are based on a capacitor mismatch compensation scheme that the amount of the transferred charge is only dependent on one of the capacitors, instead of the ratio of the two capacitors. The proposed multiply-by-two amplifier requires only one opamp in four phases to generate two effective outputs. It significantly suppresses the gain error caused by capacitor mismatch and provides better power efficiency. Furthermore, the proposed integrator with an accurate gain of one is insensitive to capacitor-mismatch and the input offset voltage of the opamp is removed completely. Finally, Monte-Carlo simulation results are presented to confirm the feasibility of these new techniques, demonstrating its suitability in high-resolution pipelined ADC or sigma-delta modulator.
      PubDate: 2018-09-01
      DOI: 10.1007/s10470-018-1212-7
      Issue No: Vol. 96, No. 3 (2018)
  • Low noise chopper-stabilized instrumentation amplifier with a ripple
           reduction loop
    • Authors: Rongshan Wei; Zhangwang Liu; Rui Zhu
      Pages: 521 - 529
      Abstract: This paper presents a low noise and residual offset chopper-stabilized precision instrumentation amplifier intended for use in measurement systems. Conventional chopper-stabilized instrumentation amplifier introduces a necessary trade-off between the low residual offset and noise provided by a high-transconductance input stage and the resulting high residual ripple. However, to achieve low noise and residual offset, the proposed chopper-stabilized instrumentation amplifier employs a relatively high-transconductance input stage to reduce the offset and 1/f noise, and uses a switched-capacitor notch filter as low-pass filter to filter out the chopper ripple caused by the up-modulated offset and 1/f noise, and introduces a ripple reduction loop (RRL) to reduce the resulting high residual ripple amplitude. The complete chopper-stabilized instrumentation amplifier is implemented in a standard 0.18 μm CMOS technology. It occupies an area of approximately 1.2 mm2 and consumes 75 μA current from a 1.6 V supply voltage. The input-referred noise power spectral density is 20 nV/√Hz and its residual offset is less than 4 μV. The RRL achieves a ripple rejection ratio of 26 dB.
      PubDate: 2018-09-01
      DOI: 10.1007/s10470-018-1214-5
      Issue No: Vol. 96, No. 3 (2018)
  • Advanced methods for nested Miller frequency compensation using voltage
    • Authors: Hassan Rekabi Bana; Ali Jalali; Elham Ghate; Aidin Tofangdarzade
      Pages: 531 - 541
      Abstract: New methods for the compensation of three-stage amplifiers are presented. In these methods, a rail-to-rail buffer enables designers to control the feedforward path. So far, the use of voltage buffer compensation has been reported merely in two-stage amplifiers. Using this in three-stage amplifiers results in the formation of left-half plane zeros, which can be applied to remove non-dominant poles. Two different methods are introduced. Firstly the voltage buffer is added to the path of the external loop capacitor to improve the gain bandwidth; secondly the voltage buffer is added to the internal loop capacitor. The internal path improves the gain bandwidth significantly (8 times in comparison with conventional NMC) by producing two left half plane zeros. Simulation results demonstrate the stability of the amplifiers and agree with design equations.
      PubDate: 2018-09-01
      DOI: 10.1007/s10470-018-1164-y
      Issue No: Vol. 96, No. 3 (2018)
  • N × M-path filters: analysis and implementation
    • Authors: Mohammad Elmi; Ali Poursaadati Zinjanab; Ali Jalali
      Pages: 543 - 554
      Abstract: Conventional N-path filters are often implemented by using a number of switches and internal low-pass filters that are used in zero-IF receivers. In this paper, by using M-path filters instead of internal low-pass filters, N  \(\times\)  M-path structure is obtained in three states: single-ended input to single-ended output, single-ended input to differential output and harmonic rejection . These structures can be used in low-IF receivers and also to tune the desired filtering frequency more precisely. Analysis and implementation of each structure is also provided.
      PubDate: 2018-09-01
      DOI: 10.1007/s10470-018-1170-0
      Issue No: Vol. 96, No. 3 (2018)
  • A low-noise small-area operational amplifier using split active-feedback
           compensation technique
    • Authors: Ippei Akita; Hicham Haibi; Makoto Ishida
      Pages: 555 - 564
      Abstract: A low-noise small-area three-stage operational amplifier is presented for arrayed sensor interface systems. The designed amplifier employs a novel small-area phase compensation scheme that allows a relatively high transconductance in the first stage, resulting in relatively low input-referred noise. The proposed amplifier implemented in a standard 180-nm CMOS process occupies an active area of only 0.015  \(\mathrm{mm}^2\) . The measurement results show that the amplifier achieves a 6.2-MHz gain-bandwidth product, an input-referred noise of 27 nV/ \(\surd \) Hz, and a phase margin of 60°. The current dissipation is 177  \(\upmu \) A at a power supply of 1.5 V.
      PubDate: 2018-09-01
      DOI: 10.1007/s10470-018-1184-7
      Issue No: Vol. 96, No. 3 (2018)
  • A low-power low-noise and high swing biopotential amplifier in
           0.18 µm CMOS
    • Authors: R. Sanjay; V. Senthil Rajan; B. Venkataramani
      Pages: 565 - 576
      Abstract: In this paper, a low-power, low-noise and high swing capacitively coupled instrumentation amplifier for biomedical applications is proposed. It uses the folded cascode operational transconductance amplifier (FC-OTA) with current scaling at the output branch to reduce the noise. To overcome the reduction in the effective transconductance of the OTA due to current scaling, series–series and shunt–shunt feedback techniques are proposed at the folded node of the FC-OTA and the composite transistor is proposed at the bottom current source of the FC-OTA. An optimization procedure is also proposed for sizing the input transistors of the FC-OTA to obtain better noise-power tradeoff. To assess the efficacy of these techniques, a biopotential amplifier is designed in 0.18 µm CMOS process and it is studied through simulation. From this study, it is found that the proposed amplifier has a 1.5–22 times and 1.4 times higher input swing and output swing respectively compared to those reported in literature. It has a gain of 39.75 dB, a bandwidth of 0.3 Hz–4.4 kHz and a total input-referred noise of 3.19 µVrms integrated over 1 Hz–10 kHz. The power consumption of the amplifier is 4.07 µW at a VDD of 1.8 V. It achieves a noise efficiency factor of 2.78, and provides input and output signal swings of 14.86 mVpp, and 1.38 Vpp respectively at THD of 1%.
      PubDate: 2018-09-01
      DOI: 10.1007/s10470-018-1207-4
      Issue No: Vol. 96, No. 3 (2018)
  • Towards memristor-based approximate accelerator: application to
           complex-valued FIR filter bank
    • Authors: Mohsen Nourazar; Vahid Rashtchi; Farshad Merrikh-Bayat; Ali Azarpeyvand
      Pages: 577 - 588
      Abstract: This paper presents a mixed-signal implementation of complex-valued FIR filter bank using a memristor-based approximate multiplier. First, a memristor-based vector–matrix multiplier was developed for complex number multiplications and then it was extended to perform the convolution operation. Finally, it was utilized for filtering application to study the potential capability of the memristor-based multipliers for accelerating digital signal processing. To evaluate the design, datasets presented by TDFIR kernel of HPEC benchmark suite, which include complex computations, were used. For simulations, Ngspice mixed-signal circuit simulator has been employed as a shared library in C++ programming environment. According to simulation results, using 6-bit accuracy for a 64 × 64 filter bank, the performance can be increased up to ~ 3 GFLOPS while presenting efficiency of ~ 4 GFLOPS/W. The results show that memristor-based mixed-signal architectures can be considered as favorable candidates for accelerating digital signal processing.
      PubDate: 2018-09-01
      DOI: 10.1007/s10470-018-1209-2
      Issue No: Vol. 96, No. 3 (2018)
  • Harmonic suppression in short-circuited stub bandpass filter by means of a
           new miniaturized bandstop filter
    • Authors: Tahereh Beiki; Mirshahram Hosseinipanah
      Pages: 589 - 596
      Abstract: In this article, a conventional short-circuited stub bandpass filter cascaded with a new miniaturized bandstop filter is presented which results in suppression of the spurious signals. The crown bandstop filter is proposed and designed using transmission line model. The combination of a crown bandstop filter, a complementary spiral resonator and a spurline is used to obtain the proposed bandstop filter with wide stopband and high rejection level. The proposed bandstop filter size is 0.31λg* 0.31λg and has a wide 3-dB stop bandwidth of 3.5 GHz. The prototype of the harmonic suppressed short-circuited stub bandpass filter is fabricated and measured. The measured upper stopband is better than 30 dB up to 3.5f0. The measured results are in good agreement with corresponding simulation results.
      PubDate: 2018-09-01
      DOI: 10.1007/s10470-018-1230-5
      Issue No: Vol. 96, No. 3 (2018)
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
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