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COMPUTER SCIENCE (1202 journals)                  1 2 3 4 5 6 7 | Last

Showing 1 - 200 of 872 Journals sorted alphabetically
3D Printing and Additive Manufacturing     Full-text available via subscription   (Followers: 20)
Abakós     Open Access   (Followers: 4)
ACM Computing Surveys     Hybrid Journal   (Followers: 28)
ACM Journal on Computing and Cultural Heritage     Hybrid Journal   (Followers: 8)
ACM Journal on Emerging Technologies in Computing Systems     Hybrid Journal   (Followers: 14)
ACM Transactions on Accessible Computing (TACCESS)     Hybrid Journal   (Followers: 3)
ACM Transactions on Algorithms (TALG)     Hybrid Journal   (Followers: 15)
ACM Transactions on Applied Perception (TAP)     Hybrid Journal   (Followers: 5)
ACM Transactions on Architecture and Code Optimization (TACO)     Hybrid Journal   (Followers: 9)
ACM Transactions on Autonomous and Adaptive Systems (TAAS)     Hybrid Journal   (Followers: 9)
ACM Transactions on Computation Theory (TOCT)     Hybrid Journal   (Followers: 12)
ACM Transactions on Computational Logic (TOCL)     Hybrid Journal   (Followers: 3)
ACM Transactions on Computer Systems (TOCS)     Hybrid Journal   (Followers: 18)
ACM Transactions on Computer-Human Interaction     Hybrid Journal   (Followers: 15)
ACM Transactions on Computing Education (TOCE)     Hybrid Journal   (Followers: 6)
ACM Transactions on Design Automation of Electronic Systems (TODAES)     Hybrid Journal   (Followers: 5)
ACM Transactions on Economics and Computation     Hybrid Journal   (Followers: 1)
ACM Transactions on Embedded Computing Systems (TECS)     Hybrid Journal   (Followers: 4)
ACM Transactions on Information Systems (TOIS)     Hybrid Journal   (Followers: 19)
ACM Transactions on Intelligent Systems and Technology (TIST)     Hybrid Journal   (Followers: 8)
ACM Transactions on Interactive Intelligent Systems (TiiS)     Hybrid Journal   (Followers: 3)
ACM Transactions on Multimedia Computing, Communications, and Applications (TOMCCAP)     Hybrid Journal   (Followers: 9)
ACM Transactions on Reconfigurable Technology and Systems (TRETS)     Hybrid Journal   (Followers: 6)
ACM Transactions on Sensor Networks (TOSN)     Hybrid Journal   (Followers: 8)
ACM Transactions on Speech and Language Processing (TSLP)     Hybrid Journal   (Followers: 9)
ACM Transactions on Storage     Hybrid Journal  
ACS Applied Materials & Interfaces     Hybrid Journal   (Followers: 31)
Acta Automatica Sinica     Full-text available via subscription   (Followers: 2)
Acta Informatica Malaysia     Open Access  
Acta Universitatis Cibiniensis. Technical Series     Open Access  
Ad Hoc Networks     Hybrid Journal   (Followers: 11)
Adaptive Behavior     Hybrid Journal   (Followers: 11)
Advanced Engineering Materials     Hybrid Journal   (Followers: 28)
Advanced Science Letters     Full-text available via subscription   (Followers: 10)
Advances in Adaptive Data Analysis     Hybrid Journal   (Followers: 7)
Advances in Artificial Intelligence     Open Access   (Followers: 15)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 4)
Advances in Catalysis     Full-text available via subscription   (Followers: 5)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 19)
Advances in Computer Engineering     Open Access   (Followers: 4)
Advances in Computer Science : an International Journal     Open Access   (Followers: 14)
Advances in Computing     Open Access   (Followers: 2)
Advances in Data Analysis and Classification     Hybrid Journal   (Followers: 54)
Advances in Engineering Software     Hybrid Journal   (Followers: 28)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 14)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 23)
Advances in Human-Computer Interaction     Open Access   (Followers: 20)
Advances in Materials Science     Open Access   (Followers: 14)
Advances in Operations Research     Open Access   (Followers: 12)
Advances in Parallel Computing     Full-text available via subscription   (Followers: 7)
Advances in Porous Media     Full-text available via subscription   (Followers: 5)
Advances in Remote Sensing     Open Access   (Followers: 49)
Advances in Science and Research (ASR)     Open Access   (Followers: 6)
Advances in Technology Innovation     Open Access   (Followers: 6)
AEU - International Journal of Electronics and Communications     Hybrid Journal   (Followers: 8)
African Journal of Information and Communication     Open Access   (Followers: 9)
African Journal of Mathematics and Computer Science Research     Open Access   (Followers: 4)
AI EDAM     Hybrid Journal  
Air, Soil & Water Research     Open Access   (Followers: 12)
AIS Transactions on Human-Computer Interaction     Open Access   (Followers: 6)
Algebras and Representation Theory     Hybrid Journal   (Followers: 1)
Algorithms     Open Access   (Followers: 11)
American Journal of Computational and Applied Mathematics     Open Access   (Followers: 5)
American Journal of Computational Mathematics     Open Access   (Followers: 4)
American Journal of Information Systems     Open Access   (Followers: 5)
American Journal of Sensor Technology     Open Access   (Followers: 4)
Anais da Academia Brasileira de Ciências     Open Access   (Followers: 2)
Analog Integrated Circuits and Signal Processing     Hybrid Journal   (Followers: 7)
Analysis in Theory and Applications     Hybrid Journal   (Followers: 1)
Animation Practice, Process & Production     Hybrid Journal   (Followers: 5)
Annals of Combinatorics     Hybrid Journal   (Followers: 4)
Annals of Data Science     Hybrid Journal   (Followers: 12)
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 12)
Annals of Pure and Applied Logic     Open Access   (Followers: 3)
Annals of Software Engineering     Hybrid Journal   (Followers: 13)
Annual Reviews in Control     Hybrid Journal   (Followers: 8)
Anuario Americanista Europeo     Open Access  
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2)
Applied and Computational Harmonic Analysis     Full-text available via subscription   (Followers: 1)
Applied Artificial Intelligence: An International Journal     Hybrid Journal   (Followers: 12)
Applied Categorical Structures     Hybrid Journal   (Followers: 2)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 12)
Applied Computer Systems     Open Access   (Followers: 2)
Applied Informatics     Open Access  
Applied Mathematics and Computation     Hybrid Journal   (Followers: 34)
Applied Medical Informatics     Open Access   (Followers: 10)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Soft Computing     Hybrid Journal   (Followers: 16)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 5)
Applied System Innovation     Open Access  
Architectural Theory Review     Hybrid Journal   (Followers: 3)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 5)
Archive of Numerical Software     Open Access  
Archives and Museum Informatics     Hybrid Journal   (Followers: 146)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 5)
arq: Architectural Research Quarterly     Hybrid Journal   (Followers: 8)
Artifact     Hybrid Journal   (Followers: 2)
Artificial Life     Hybrid Journal   (Followers: 7)
Asia Pacific Journal on Computational Engineering     Open Access  
Asia-Pacific Journal of Information Technology and Multimedia     Open Access   (Followers: 1)
Asian Journal of Computer Science and Information Technology     Open Access  
Asian Journal of Control     Hybrid Journal   (Followers: 1)
Assembly Automation     Hybrid Journal   (Followers: 2)
at - Automatisierungstechnik     Hybrid Journal   (Followers: 1)
Australian Educational Computing     Open Access   (Followers: 1)
Automatic Control and Computer Sciences     Hybrid Journal   (Followers: 5)
Automatic Documentation and Mathematical Linguistics     Hybrid Journal   (Followers: 5)
Automatica     Hybrid Journal   (Followers: 12)
Automation in Construction     Hybrid Journal   (Followers: 6)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 9)
Basin Research     Hybrid Journal   (Followers: 5)
Behaviour & Information Technology     Hybrid Journal   (Followers: 53)
Big Data and Cognitive Computing     Open Access   (Followers: 2)
Biodiversity Information Science and Standards     Open Access  
Bioinformatics     Hybrid Journal   (Followers: 304)
Biomedical Engineering     Hybrid Journal   (Followers: 15)
Biomedical Engineering and Computational Biology     Open Access   (Followers: 13)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 21)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 37)
Briefings in Bioinformatics     Hybrid Journal   (Followers: 48)
British Journal of Educational Technology     Hybrid Journal   (Followers: 144)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 12)
c't Magazin fuer Computertechnik     Full-text available via subscription   (Followers: 1)
CALCOLO     Hybrid Journal  
Calphad     Hybrid Journal   (Followers: 2)
Canadian Journal of Electrical and Computer Engineering     Full-text available via subscription   (Followers: 15)
Capturing Intelligence     Full-text available via subscription  
Catalysis in Industry     Hybrid Journal   (Followers: 1)
CEAS Space Journal     Hybrid Journal   (Followers: 2)
Cell Communication and Signaling     Open Access   (Followers: 2)
Central European Journal of Computer Science     Hybrid Journal   (Followers: 5)
CERN IdeaSquare Journal of Experimental Innovation     Open Access   (Followers: 3)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 14)
ChemSusChem     Hybrid Journal   (Followers: 7)
China Communications     Full-text available via subscription   (Followers: 7)
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 2)
CIN Computers Informatics Nursing     Full-text available via subscription   (Followers: 11)
Circuits and Systems     Open Access   (Followers: 15)
Clean Air Journal     Full-text available via subscription   (Followers: 1)
CLEI Electronic Journal     Open Access  
Clin-Alert     Hybrid Journal   (Followers: 1)
Cluster Computing     Hybrid Journal   (Followers: 1)
Cognitive Computation     Hybrid Journal   (Followers: 4)
COMBINATORICA     Hybrid Journal  
Combinatorics, Probability and Computing     Hybrid Journal   (Followers: 4)
Combustion Theory and Modelling     Hybrid Journal   (Followers: 14)
Communication Methods and Measures     Hybrid Journal   (Followers: 12)
Communication Theory     Hybrid Journal   (Followers: 22)
Communications Engineer     Hybrid Journal   (Followers: 1)
Communications in Algebra     Hybrid Journal   (Followers: 3)
Communications in Computational Physics     Full-text available via subscription   (Followers: 2)
Communications in Information Science and Management Engineering     Open Access   (Followers: 4)
Communications in Partial Differential Equations     Hybrid Journal   (Followers: 3)
Communications of the ACM     Full-text available via subscription   (Followers: 51)
Communications of the Association for Information Systems     Open Access   (Followers: 16)
COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering     Hybrid Journal   (Followers: 3)
Complex & Intelligent Systems     Open Access   (Followers: 1)
Complex Adaptive Systems Modeling     Open Access  
Complex Analysis and Operator Theory     Hybrid Journal   (Followers: 2)
Complexity     Hybrid Journal   (Followers: 6)
Complexus     Full-text available via subscription  
Composite Materials Series     Full-text available via subscription   (Followers: 8)
Computación y Sistemas     Open Access  
Computation     Open Access   (Followers: 1)
Computational and Applied Mathematics     Hybrid Journal   (Followers: 2)
Computational and Mathematical Methods in Medicine     Open Access   (Followers: 2)
Computational and Mathematical Organization Theory     Hybrid Journal   (Followers: 2)
Computational and Structural Biotechnology Journal     Open Access   (Followers: 2)
Computational and Theoretical Chemistry     Hybrid Journal   (Followers: 9)
Computational Astrophysics and Cosmology     Open Access   (Followers: 1)
Computational Biology and Chemistry     Hybrid Journal   (Followers: 12)
Computational Chemistry     Open Access   (Followers: 2)
Computational Cognitive Science     Open Access   (Followers: 2)
Computational Complexity     Hybrid Journal   (Followers: 4)
Computational Condensed Matter     Open Access  
Computational Ecology and Software     Open Access   (Followers: 9)
Computational Economics     Hybrid Journal   (Followers: 9)
Computational Geosciences     Hybrid Journal   (Followers: 17)
Computational Linguistics     Open Access   (Followers: 23)
Computational Management Science     Hybrid Journal  
Computational Mathematics and Modeling     Hybrid Journal   (Followers: 8)
Computational Mechanics     Hybrid Journal   (Followers: 5)
Computational Methods and Function Theory     Hybrid Journal  
Computational Molecular Bioscience     Open Access   (Followers: 2)
Computational Optimization and Applications     Hybrid Journal   (Followers: 7)
Computational Particle Mechanics     Hybrid Journal   (Followers: 1)
Computational Research     Open Access   (Followers: 1)
Computational Science and Discovery     Full-text available via subscription   (Followers: 2)
Computational Science and Techniques     Open Access  
Computational Statistics     Hybrid Journal   (Followers: 14)
Computational Statistics & Data Analysis     Hybrid Journal   (Followers: 30)
Computer     Full-text available via subscription   (Followers: 98)
Computer Aided Surgery     Open Access   (Followers: 6)
Computer Applications in Engineering Education     Hybrid Journal   (Followers: 8)
Computer Communications     Hybrid Journal   (Followers: 16)
Computer Journal     Hybrid Journal   (Followers: 9)
Computer Methods in Applied Mechanics and Engineering     Hybrid Journal   (Followers: 24)
Computer Methods in Biomechanics and Biomedical Engineering     Hybrid Journal   (Followers: 12)
Computer Methods in the Geosciences     Full-text available via subscription   (Followers: 2)

        1 2 3 4 5 6 7 | Last

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  [2350 journals]
  • Introduction to the special issue on selected papers from the
           ELECO’2017 conference
    • Authors: H. Hakan Kuntman; Oguzhan Cicekoglu; Serdar Ozoguz
      Pages: 1 - 4
      PubDate: 2018-10-01
      DOI: 10.1007/s10470-018-1297-z
      Issue No: Vol. 97, No. 1 (2018)
  • A class of MOSFET-C multifunction filters
    • Authors: Bilgin Metin; Oguzhan Cicekoglu; Serdar Ozoguz
      Pages: 5 - 13
      Abstract: Abstract In this paper, a set of current-mode MOSFET-C multifunction filters are presented. Since MOS transistors operating in saturation region are used instead of the passive resistors, key filter parameters are all electronically controllable. The main properties of a total of eight different multifunction filters are catalogued in tabular form. The proposed circuits exhibit attractive features such as circuit simplicity and reduced chip area compared to the classical analog filters that require active elements including large number of transistors. All the filters are simulated in spectre simulation software in Cadence design environment using 90 nm UMC CMOS process parameters.
      PubDate: 2018-10-01
      DOI: 10.1007/s10470-018-1272-8
      Issue No: Vol. 97, No. 1 (2018)
  • Current inverting metamutator, its implementation with a new single active
           device and applications
    • Authors: Elham Minayi; I. Cem Göknar
      Pages: 15 - 25
      Abstract: Abstract A new kind of metamutator, namely “Current Inverting Metamutator”, its realizations using different types of active blocks and some of its applications like voltage-mode universal biquadratic filter with three input and one output terminals are presented. The proposed circuits can realize all standard filters, namely, low-pass, band-pass, high-pass, notch and all-pass without passive component matching conditions. The proposed circuit offers the features of using grounded capacitors and orthogonal controllability of angular frequency and quality factor. Then a novel realization of metamutator with one active device, additive and differential IC (AD-IC) is proposed and implemented with twelve transistors only. The metamutator with AD-IC has the advantages: (1) of creating new realizations of memristors, capacitance multipliers, inductor simulators, frequency dependent negative resistors which can be used to make IC active filters, (2) less is the number (only one) of active devices, less is the amount of disparity, (3) no need to match passive component values.
      PubDate: 2018-10-01
      DOI: 10.1007/s10470-018-1239-9
      Issue No: Vol. 97, No. 1 (2018)
  • Design of a constant-bandwidth variable-gain amplifier for LTE receivers
    • Authors: Ali Dogus Gungordu; Nil Tarim
      Pages: 27 - 38
      Abstract: Abstract In this study, a constant-bandwidth variable-gain amplifier (VGA) is presented for long-term evolution (LTE) receivers. The presented VGA’s description is given with a newly proposed exponential-current generator, and also the common-mode feedback and the DC-offset cancellation (DCOC) circuits. The proposed exponential current generator is based on the Taylor series approximation in such a way that it can be expanded to meet the required gain control range. The simulations are performed using the TSMC 180 nm process technology with Cadence Analog Virtuoso. The VGA has a 45 dB gain control range, 180 MHz bandwidth, 15.7 dB m the third-order input-intercept point for minimum gain and below 20 dB noise figure for maximum gain which makes it convenient for LTE receivers. The simulations also show that the bandwidth of the VGA is fairly constant over the control range. Monte Carlo simulations reveal that by using a DCOC circuit, the VGA provides 30 dB output offset rejection. The overall power consumption of the circuit is 9.1 mW under a 1.8 V power supply.
      PubDate: 2018-10-01
      DOI: 10.1007/s10470-018-1237-y
      Issue No: Vol. 97, No. 1 (2018)
  • Time-dependent dielectric breakdown (TDDB) reliability analysis of CMOS
           analog and radio frequency (RF) circuits
    • Authors: Mustafa Tarık Saniç; Mustafa Berke Yelten
      Pages: 39 - 47
      Abstract: Abstract In this paper, a methodology to analyze the time dependent dielectric breakdown (TDDB) reliability of CMOS analog and radio frequency (RF) circuits has been proposed and applied to common circuit building blocks, including an operational amplifier, a RF mixer, and a comparator. The analysis includes both finding the transistors in the circuit topology that are the most sensitive to TDDB degradation, as well as, observing the trends of TDDB degradation over a series of nanoscale process technologies for each building block. Analysis outcomes suggest that the TDDB degradation resilience goes up for operational amplifiers and comparators whereas it decreases for RF mixers as the device channel lengths come down. The trends have been explained on the basis of the circuit block topology and device physics.
      PubDate: 2018-10-01
      DOI: 10.1007/s10470-018-1243-0
      Issue No: Vol. 97, No. 1 (2018)
  • A new current mode CMOS variable gain amplifier using a new
           pseudo-exponential function
    • Authors: M. Sait Altuner; Metin Yazgi; Ali Zeki; Hadi G. Momen; Ali Toker
      Pages: 49 - 57
      Abstract: Abstract In this paper, a new pseudo-exponential function is described and a new CMOS exponential-control variable gain amplifier (VGA) based on the new function is introduced. No multiplier is needed in the proposed approach. The VGA operates in current mode and includes two different stages. The first stage is a simple current amplifier while the second stage is an attenuator. The overall behavior of the stages gives the new pseudo-exponential function. The VGA circuit has been designed and simulated for a 0.18 μ CMOS process. Post layout results show that the circuit has a bandwidth of 164 MHz and a gain range of 32.5 dB between − 21 and + 11.5 dB.
      PubDate: 2018-10-01
      DOI: 10.1007/s10470-018-1234-1
      Issue No: Vol. 97, No. 1 (2018)
  • MOS-only polyphase filter with small chip area
    • Authors: Hacer Atar Yildiz
      Pages: 59 - 68
      Abstract: Abstract In this paper, it is aimed to realize a systematic approach for the realization of the MOS only complex polyphase filters which occupy small chip area. For this purpose, we used a technique based on adding cross-coupled transistors realizing local positive feedback, which, in turn, increases filter time constants. Thanks to this method, a substantial reduction in the filter chip area is achieved without having to use bulky on chip capacitors. The usefullness of the approach is validated by comparing the layouts of the designed CMOS circuit with the conventional RC polyphase filter. Post-layout simulation results using SPECTRE in CADENCE design environment are provided to verify feasibility of the proposed complex filter.
      PubDate: 2018-10-01
      DOI: 10.1007/s10470-018-1271-9
      Issue No: Vol. 97, No. 1 (2018)
  • The effects of the peaking currents on the performance of the Doherty
           power amplifier: an analytical and experimental study
    • Authors: Omer Aydin; Tayfun Aydin
      Pages: 69 - 74
      Abstract: Abstract Recognizing that the ratio of the peaking and main amplifier transconductances is a crucial parameter in the design of Doherty power amplifiers, we propose an analytical method to specify the optimum value of this ratio. The method is validated both through simulations based on circuit-level model of the Doherty power amplifier and the experiments using a 100 W dual driven symmetrical LDMOS Doherty power amplifier manufactured. According to the experiments, overdriven peaking amplifier is resulting in lower drain voltage at the main side, hence causing low power efficiency. Conversely, underdriven peaking amplifier is saturating the main amplifier, which in turn results in decreased linearity. Both simulation and experimental results clearly revealed that the amplifier efficiency and linearity strongly depend on the drive levels of the main and peaking amplifiers. The third-order intermodulation distortion of a 44 dBm and 2.655 GHz Doherty power amplifier which is measured as − 29.75 dBc in the overdriven case, is increased up to − 19.40 dBc in the underdriven case. However, the drain efficiency which is measured at 47.84% in the overdriven case is improved to 54.36% when the peaking amplifier is operated in the underdriven mode for 47 dBm and 2.655 GHz.
      PubDate: 2018-10-01
      DOI: 10.1007/s10470-018-1202-9
      Issue No: Vol. 97, No. 1 (2018)
  • A novel serial link transceiver, using a new combination of MPPM and PAM
    • Authors: Noushin Ghaderi; Erfan Allasvand; Abouzar Mohammadi; Saman Kamran
      Pages: 75 - 85
      Abstract: Abstract In this paper, an efficient modulation technique, which was a new combination of multi-pulse position modulation (MPPM) and pulse amplitude modulation methods, was introduced. Using the proposed modulation, 8-bit per symbol data rate was achieved. Applying this method increased the data rate value and reduced the power consumption value. In addition, due to the use of MPPM method in the proposed modulation, the generated signal was of the return-to-zero nature. This means that the clock signal was embedded inside the modulated signal. Therefore, there was no need to apply a complicated clock recovery circuit in the receiver side. Moreover, by sending the 8-bit data and clock signal through a single channel, the value of pin count was reduced considerably. To implement this new scheme, a new transceiver was proposed in this paper. Further, a very simple slot selector circuit was proposed to create 5-time slots per symbol. In addition, a new structure of absolute comparator circuit was designed to reduce the number of comparators at the receiver side. The whole power dissipation of the proposed transceiver was only 101 mW.
      PubDate: 2018-10-01
      DOI: 10.1007/s10470-018-1233-2
      Issue No: Vol. 97, No. 1 (2018)
  • A new implementation of the reconfigurable analog baseband low pass filter
           with cell-based variable transconductance amplifier
    • Authors: Ersin Alaybeyoğlu; Hakan Kuntman
      Pages: 87 - 96
      Abstract: Abstract In this study, a new implementation of reconfigurable analog baseband (ABB) low pass filter employing cell-based variable transconductance amplifier (cell-based VTA) is presented for multi-standard transceivers. The configurability of the designed filter is supported by activating different cells and changing biasing currents of each cell. Multi-standard transceivers allow to process different protocols in a single chip. These type transceivers need reconfigurable analog elements. In this work reconfigurable ABB low-pass filter is designed to support the application of Bluetooth, CDMA2000, Wideband CDMA, and IEEE 802.11a/b/g/n wireless LANs and 2G/3G/4G. The designed filter operates between 20 kHz and 40 MHz. The minimum value of the designed filter’s third order intersection point is 21.4 dBm. The performance of the designed circuit is tested with TSMC 0.18 µm technology in CADENCE environment.
      PubDate: 2018-10-01
      DOI: 10.1007/s10470-018-1241-2
      Issue No: Vol. 97, No. 1 (2018)
  • A novel low power MOSFET-C band pass filter for low frequency applications
           with subthreshold models based on polynomial regression
    • Authors: Deniz Ozenli; H. Hakan Kuntman
      Pages: 97 - 105
      Abstract: Abstract A novel current mode MOSFET-C filter is presented for a wide range of low frequency applications ranging from biomedical signal sensing up to speech processing region. Presented filter consumes only 2.3 µW with symmetrical supply voltages as low as ± 0.5 V. The filter structure can be easily adjusted by means of changing external capacitor values. Furthermore, proposed filter is given with a novel design methodology based on polynomial regressive small signal models. In this way, promising interaction between design parameters such as VGS, VDS, channel width (W), channel length (L) and filter specifications such as f0, Q and power is provided. Simulation results with 0.18 µm TSMC CMOS technology are given, furthermore proposed filter is tested to process a real fetal PCG signal at 355.4 Hz. It is shown that proposed filter attains a promising performance in comparison with the previously presented counterparts for low frequency applications.
      PubDate: 2018-10-01
      DOI: 10.1007/s10470-018-1227-0
      Issue No: Vol. 97, No. 1 (2018)
  • Designing constant phase elements of complement order
    • Authors: Jaroslav Koton; David Kubanek; Norbert Herencsar; Jan Dvorak; Costas Psychalinos
      Pages: 107 - 114
      Abstract: Abstract Once designing analogue fractional-order function blocks, the capacitive and/or inductive fractional-order elements (FOEs), also referred to as constant phase elements, being defined with their fractional order \(\alpha\) ( \(0< \alpha < 1\) ) are required. Although currently capacitive FOEs are being discussed in the literature, still these passive elements are not readily available in discrete form and mainly do not offer the whole span of \(\alpha\) . Therefore, to overcome such an obstacle, we primary propose the transformation of FOEs and their fractional order \(\alpha\) to obtain the complement order \(\beta\) , whereas \(\beta =1{-}\alpha\) . Following the theory and mathematical description, also other transformation cases on fractional-order element are discussed and analysed in this paper. Using simple impedance converter employing single current conveyor and transconductance amplifier, the theoretical presumptions are verified both by simulations and experimental measurements.
      PubDate: 2018-10-01
      DOI: 10.1007/s10470-018-1257-7
      Issue No: Vol. 97, No. 1 (2018)
  • Energy-efficient switching scheme based on floating technique for SAR ADC
    • Authors: Ruixue Ding; Depeng Sun; Shubin Liu; Hongzhi Liang; Zhangming Zhu
      Pages: 115 - 122
      Abstract: Abstract A high energy-efficiency capacitor switching scheme for successive approximation register (SAR) analog-to-digital converters is proposed in the paper. During the design procedure, the charge characteristic of the floating capacitor and the technique of splitting capacitor ensure zero energy consumption of switching operation. With the reset energy of capacitor arrays taken into account, the proposed switching scheme can achieve 100% less switching energy over the conventional switching scheme. Furthermore, this work also achieves about 50% area reduction with only two reference voltages. The behavioral simulation of the proposed SAR was performed, the maximum differential nonlinearity and maximum integral nonlinearity are 0.451 and 0.452 LSB respectively.
      PubDate: 2018-10-01
      DOI: 10.1007/s10470-018-1242-1
      Issue No: Vol. 97, No. 1 (2018)
  • An energy efficient SAR ADC with lowest total switching energy consumption
    • Authors: B. Ghanavati; E. Abiri; A. Keyhani; M. R. Salehi; A. Sanyal
      Pages: 123 - 133
      Abstract: Abstract A new capacitor switching scheme with considerable energy saving for successive approximation register (SAR) analog to digital converter (ADC) is presented. Employing different switching sequence and also one switching event in a cycle in this technique, result in 97.67% reduction in switching energy. Besides that, in the proposed method, an 8 × reduction in total capacitance compared to the conventional architectures achieved by benefiting from LSB split capacitor array. Furthermore, the proposed technique shows the minimum power dissipation in driving the switches since it has only one switching event per cycle and lowest capacitor array compared to the other techniques. Employed the proposed switching scheme, a 10-bit 1-kS/s SAR ADC is designed in 0.18-µm CMOS technology with an active area of 0.025 mm2. With a 1-V power supply for analog and 0.5-V for digital circuit, the ADC achieves an ENOB of 9.73 bits and a FoM of 4.1 fJ/conversion-step. The proposed ADC can find application in biomedical engineering systems and other fields which low power consumption is needed.
      PubDate: 2018-10-01
      DOI: 10.1007/s10470-018-1250-1
      Issue No: Vol. 97, No. 1 (2018)
  • Analysis and design of highly linear Gm–TIA PGA with flat gain
    • Authors: Cheng Huang; Jianhui Wu; Chunfeng Bai
      Pages: 135 - 141
      Abstract: Abstract This paper analyzes high linearity Cherry–Hopper programmable-gain-amplifier (PGA), which is a cascade of linear transconductance (Gm) stage and transimpedance (TIA) stage. Basing on these analysis, reasons for gain peaking of Gm–TIA PGA are discussed. A Gm–TIA PGA with flat gain response and high power-efficiency is designed, and implemented in a 0.18 μm CMOS process. It draws 260-μA current from a supply of 1.8-V, while maintains a constant bandwidth of 24-MHz when driving a capacitive load of 2-pF. Flat gain response over the gain range is obtained, and the measured OIP3 reaches 19.5 dBm.
      PubDate: 2018-10-01
      DOI: 10.1007/s10470-018-1265-7
      Issue No: Vol. 97, No. 1 (2018)
  • Scaled-down reference switching scheme for low-power SAR ADCs
    • Authors: Seung-Uk Baek; Se-Won Lee; Kang-Yoon Lee; Minjae Lee
      Pages: 143 - 148
      Abstract: Abstract An energy-efficient scaled-down reference (SDR) digital-to-analogue converter switching sequence is presented for a low-power successive approximation register analogue-to-digital converter. Owing to the fact that the proposed technique utilizes only a quarter of the capacitor array for input sampling, an SDR (Vref/4) and ground (Gnd) for the same input are required for conversion cycles, which achieve reduced switching energy and high linearity. The SDR switching structure improves the efficiency of average switching energy by 99.61% and reduces the total number of required capacitors in the digital-to-analogue converter arrays by 50% compared to the conventional structure.
      PubDate: 2018-10-01
      DOI: 10.1007/s10470-018-1279-1
      Issue No: Vol. 97, No. 1 (2018)
  • Fractional order inverse filters using operational amplifier
    • Authors: D. R. Bhaskar; Manoj Kumar; Pragati Kumar
      Pages: 149 - 158
      Abstract: Abstract Two new op-amp-based multifunction filter structures are proposed which can realize fractional order inverse low pass, high pass and band pass filters. In the first configuration, op-amp is used in an inverting mode while in the second structure op-amp is employed in non-inverting mode. To the best knowledge of the authors, any fractional order inverse filter structure employing any active element/device has not been reported in the open-literature so far. The proposed inverse filters have been simulated in PSPICE using µA741-type op-amp as well as in MATLAB to validate the theoretical propositions.
      PubDate: 2018-10-01
      DOI: 10.1007/s10470-018-1287-1
      Issue No: Vol. 97, No. 1 (2018)
  • Low-power Gm-boosted complementary Colpitts LC-VCO/QVCO
    • Authors: Mohammad Jafar Hemmati; Rasoul Dehghani; Ahmad Hakimi; Sajad Naderi Nejad
      Pages: 159 - 168
      Abstract: Abstract In this work, a new differential topology of Colpitts VCO with an enhanced transconductance is presented. The proposed circuit is consisted of an NMOS and a PMOS differential Colpitts cores configured as complementary, and also an LC resonator. The VCO is designed to oscillate at 5 GHz which consumes 1.11 VA from 1.4 V supply voltage. In addition, a modified version of the proposed VCO is designed for lower power applications. This circuit employs new positive feedbacks to enhance the VCO’s transconductance and reduce the supply voltage. The modified VCO operates with 1.1 V power supply while dissipating 1 mW. To investigate the performance of the proposed circuits, the transconductance of them are theoretically analyzed. Also, two new quadrature VCOs (QVCOs) are presented which are realized by two identical latter proposed Colpitts VCOs. A linear analysis is presented to confirm that the first oscillator can generate outputs with 90° phase differences. The proposed circuits are designed in 0.18-μm RF-CMOS technology. Finally, prototype circuits of the proposed VCOs are fabricated to validate the theoretical results. The measurement results are summarized to demonstrate the main features of the proposed oscillators.
      PubDate: 2018-10-01
      DOI: 10.1007/s10470-018-1288-0
      Issue No: Vol. 97, No. 1 (2018)
  • A highly energy-efficient switching scheme for SAR ADC with the redundant
           capacitance splitting technology
    • Authors: Jian Liu; Shubin Liu; Lei Huang; Zhangming Zhu
      Pages: 169 - 176
      Abstract: Abstract In this letter, a highly energy-efficient switching scheme for successive approximation register (SAR) analog-to-digital converters (ADC) is presented with the redundant capacitance splitting technology. The redundant capacitance splitting technology is put forward innovatively to divide the convert cycles into two parts: high bits cycles and low bits cycles. And through a simple switch, the redundant capacitance is split off from the capacitance array in the high bits convert cycles, resulting in the improvement of SAR ADC performance. With the monotonic mode, the first bit cycle and the second bit cycle are completed without consuming any switching energy. The proposed novel switching scheme can achieve 99.54% less switching energy and 75% reduction in capacitor area compared with the conventional switching scheme for SAR ADC, respectively.
      PubDate: 2018-10-01
      DOI: 10.1007/s10470-018-1302-6
      Issue No: Vol. 97, No. 1 (2018)
  • Realization of a higher fractional order element based on novel OTA based
           IIMC and its application in filter
    • Authors: Rakesh Verma; Neeta Pandey; Rajeshwari Pandey
      Pages: 177 - 191
      Abstract: Abstract This paper presents higher order fractional element using the concept of impedance inverter circuit based on operational transcoductance amplifier (OTA). Firstly the concept of OTA impedance inverter is generalized in fractional domain which is followed by presentation of novel OTA based inverted impedance multiplier circuit (IIMC) and its generalization. Effect of OTA parasites on performance of proposed IIMC is also presented. The usefulness of the proposal is illustrated through implementation of fractional order filter of higher order using IIMC. The functional verification of all proposed circuits is done through SPICE simulations using 0.18 µm TSMC CMOS technology parameter. The fractional capacitors of orders 0.2 and 0.5 are realized using truncated infinite order domino RC ladder network and are considered for all simulations in this work. The proposed IIMC is experimentally verified through hardware prototyping using LM 13600N dual OTAs IC. The simulation and experimental results corroborate with theoretical prepositions.
      PubDate: 2018-10-01
      DOI: 10.1007/s10470-018-1315-1
      Issue No: Vol. 97, No. 1 (2018)
School of Mathematical and Computer Sciences
Heriot-Watt University
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