# IEEE Transactions on Circuits and Systems II: Express Briefs

## Issue 9 • Sept. 2018

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## Filter Results

Displaying Results 1 - 25 of 35

Publication Year: 2018, Page(s):C1 - C4
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• ### IEEE Transactions on Circuits and Systems—II:Express Briefs publication information

Publication Year: 2018, Page(s): C2
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• ### Noise Figure of a Balanced Amplifier

Publication Year: 2018, Page(s):1129 - 1133
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Noise figure expression of a balanced amplifier built with lossy divider and combiner and two imperfectly noise-matched component amplifiers is derived analytically using the method of noise waves in terms of the noise parameters of the amplifiers. We present analytical expressions for the three noise parameters of the balanced amplifier. We show that a low-noise amplifier optimized to be used as ... View full abstract»

• ### Extended-Bandwidth Negative Impedance Converters by Nested Networks

Publication Year: 2018, Page(s):1134 - 1138
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We show a novel scheme for increasing resistive bandwidth in opamp negative impedance converters (NICs) with recursive topologies. A simplified theoretical model indicates bandwidth improvement due to altering pole and zero locations in the network’s transfer function by allowing certain resistor terms to take negative values. We extend established practices by allowing negative resistors as NIC c... View full abstract»

• ### Temperature Compensation in CMOS Peaking Current References

Publication Year: 2018, Page(s):1139 - 1143
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In this brief, modifications to the peaking current reference with MOS transistors operating in the subthreshold and the strong inversion region has been proposed by means of which very small currents with immunity to temperature variations on a chip can be obtained. Temperature compensation can be done by adding a source degeneration resistor to the conventional peaking current source structure. ... View full abstract»

• ### An Op-Amp Approach for Bandpass VGAs With Constant Bandwidth

Publication Year: 2018, Page(s):1144 - 1148
Cited by:  Papers (2)
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Two approaches to implement variable gain amplifiers based on Miller op-amps are discussed. One has true constant bandwidth while the other has essentially reduced bandwidth variations with varying gain. Servo-loops and ac coupling techniques with quasi floating gate transistors are used to provide a bandpass response with very low cutoff frequency in the range of hertz. In practice, one of the sc... View full abstract»

• ### Boundary Analysis for the Derivative of Driving Point Impedance Functions

Publication Year: 2018, Page(s):1149 - 1153
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Four theorems are presented in this brief by performing boundary analysis of the derivative of driving point impedance functions evaluated at the origin. Also, the circuits corresponding to these driving point impedance functions, which are obtained as the natural results of presented theorems, are given. Driving point impedance functions are mainly used for synthesis of networks containing RL, RC... View full abstract»

• ### A 65-nm CMOS 6-Bit 20 GS/s Time-Interleaved DAC With Full-Binary Sub-DACs

Publication Year: 2018, Page(s):1154 - 1158
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A 6-bit 20 GS/s two-channel time-interleaved current-steering digital-to-analog converter (DAC) with compact full-binary sub-DACs is presented. Optimally adjusted transition timings between the input data and the interleaving clock minimize glitches by the time-interleaving switches and enhance the high-frequency linearity. In order to prevent static linearity degradation by the leakage current th... View full abstract»

• ### Investigation of the Effect of Weak Non-Linearities on P1dB and Efficiency of Class B/J/J* Amplifiers

Publication Year: 2018, Page(s):1159 - 1163
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The variation of phase of the current through the non-linear intrinsic capacitances of a high-power RF device caused by the variation of the phase in the continuum of drain voltage waveforms in Class B/J/J* leads to a reduction of intrinsic drain current when moving from class B to class J* while the drain current increases from class B to class J. Consequently, a subset of voltage waveforms of th... View full abstract»

• ### A 1-GS/s 11-Bit SAR-Assisted Pipeline ADC With 59-dB SNDR in 65-nm CMOS

Publication Year: 2018, Page(s):1164 - 1168
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We present an 11-bit 1-GS/s time-interleaved ($\times 2$) successive approximation register (SAR)-assisted pipeline analog-to-digital converter (ADC) for wideband direct sampling radio-frequency receivers. The proposed ADC architecture combines the speed advantage of the pipeline algorithm and the structural simplicity of the S... View full abstract»

• ### A Systematic Design Methodology for Class-AB-Style Ring Amplifiers

Publication Year: 2018, Page(s):1169 - 1173
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This brief introduces a design approach for Class-AB-style ring amplifiers which differs from the design of conventional amplifiers. The theory of operation of Class-AB-style ring amplifier is discussed as well as the different design tradeoffs that affect its design. Consequently, a systematic design methodology for Class-AB-style ring amplifier is introduced. A design example of a switched-capac... View full abstract»

• ### A Coin-Battery-Powered LDO-Free 2.4-GHz Bluetooth Low-Energy Transmitter With 34.7% Peak System Efficiency

Publication Year: 2018, Page(s):1174 - 1178
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This brief reports a 2.4-GHz Bluetooth low-energy (BLE) transmitter (TX) that can operate against a coin-battery voltage discharging from 1.5 to 1 V, corresponding to a 99.2% battery capacity usage. Specifically, a class-B/C push–pull power amplifier with dual feedback control loops is proposed to dynamically adjust two gate biases, ensuring stable output power and low output HD2. The T... View full abstract»

• ### On the Impact of the Mutual Reactance on the Radiated Power and on the Achievable Rates

Publication Year: 2018, Page(s):1179 - 1183
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In this brief, we consider the mutual reactance of hypothetical isotropic radiators and the influence of the mutual reactance on antenna arrays with zero mutual resistance. We compute the mutual reactance of hypothetical isotropic radiators using passivity, which has not been considered in wireless communications literature. We show that when an antenna array with zero mutual resistance is excited... View full abstract»

• ### A Novel Concept of Virtual Impedance for High Frequency Tri-Band Impedance Matching Networks

Publication Year: 2018, Page(s):1184 - 1188
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This brief introduces a novel concept of a virtual impedance for tri-band impedance matching. The proposed mathematical concept, when applied in practical realization, simplifies the design of tri-band matching to a great extent and also enhances the achievable frequency transformation ratios beyond 7.3. A good agreement between simulation and measurement results on a prototype, designed on RO5880... View full abstract»

• ### System-Level Analysis of Phase Noise in Full-Duplex Wireless Transceivers

Publication Year: 2018, Page(s):1189 - 1193
Cited by:  Papers (1)
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A system-level analysis of phase noise in full-duplex wireless transceivers is presented. It quantitatively relates phase-noise-induced residual self-interference (SI) noise power spectral density with full-duplex system design parameters, such as the amount of SI suppression in the antenna and RF domains, the SI channel delay, voltage-controlled oscillator (VCO) phase noise and figure of merit, a... View full abstract»

• ### An Improved Gauss-Seidel Algorithm and Its Efficient Architecture for Massive MIMO Systems

Publication Year: 2018, Page(s):1194 - 1198
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Compared to most of the linear detection algorithms in massive multiple-input multiple-output (MIMO) systems, the Gauss-Seidel algorithm with initialization (GSI) promises a faster convergence rate. We improve the GSI algorithm by employing the first three items of Taylor expansion to approximate the reciprocals of diagonal entries and using the group inversion to obtain the inversion of the lower... View full abstract»

• ### An Approximate Closed-Form Transfer Function Model for Multiconductor Transmission Lines

Publication Year: 2018, Page(s):1199 - 1203
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This brief presents an intuitive, simple, and widely applicable approximate closed-form transfer function model for multiconductor transmission lines (MTLs). Rigorous closed-form transfer functions are derived from the telegrapher’s equation and approximated for a wide range of MTLs that satisfy validity conditions. Theoretical error bounds are also proposed and tightly estimate the approximation ... View full abstract»

• ### Bipartite Tracking Consensus of Linear Multi-Agent Systems With a Dynamic Leader

Publication Year: 2018, Page(s):1204 - 1208
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In this brief, the distributed bipartite tracking consensus problem for linear multi-agent systems (MASs) in the presence of a single leader is investigated. Compared with some related works on this topic, the leader’s control inputs in the present MAS model are allowed to be nonzero and unknown to each follower. To guarantee bipartite tracking consensus, a new kind of distributed non-smooth proto... View full abstract»

• ### Fully Distributed Adaptive PI Controllers for Heterogeneous Linear Networks

Publication Year: 2018, Page(s):1209 - 1213
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This brief works on the distributed adaptive consensus protocol design problem of heterogeneous linear networks over directed graphs. By introducing additive monotone increasing functions on both proportional and integral terms, a distributed adaptive consensus protocol is presented to achieve consensus. The property of$M$-matr... View full abstract»

• ### Circulating Current Suppression of Parallel Photovoltaic Grid-Connected Converters

Publication Year: 2018, Page(s):1214 - 1218
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The photovoltaic (PV) grid-connected converter (GCC) is a critical interface between solar energy and the power grid. Improved efficiency is possible if several PV GCCs have a common array bus. However, the dc side shunt causes the circulation of a zero-sequence current, which will distort the GCC or even damage semiconductor devices. The zero-sequence current includes high- and low-frequency comp... View full abstract»

• ### Enhanced Power-Delivered-to-Load Through Planar Multiple-Harmonic Wireless Power Transmission

Publication Year: 2018, Page(s):1219 - 1223
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In this brief, a method is presented to enhance the amount of power delivered to load (PDL) by making use of three-harmonic wireless power transmission while it does not occupy larger area than a conventional single-coil system. The proposed system consists of three inductive links each one tuned at a harmonic of the operating frequency. A single power amplifier supplies all of them. Therefore, th... View full abstract»

• ### Area-Time Efficient FAST Corner Detector Using Data-Path Transposition

Publication Year: 2018, Page(s):1224 - 1228
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Corner detection plays an essential role in many computer vision applications, e.g., object recognition, motion analysis, and stereo matching. In this brief, we present a novel data-path transposition strategy for the hardware design of the FAST corner detector. The proposed design transposes the data-path of the conventional architecture to enable partial evaluation of multiple corners in a pipel... View full abstract»

• ### A Streaming Motion Magnification Core for Smart Image Sensors

Publication Year: 2018, Page(s):1229 - 1233
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This brief proposes a modified Eulerian Video Magnification (EVM) algorithm and a hardware implementation of a motion magnification core for smart image sensors. Compared to the original EVM algorithm, we perform the pixel-wise temporal bandpass filtering only once rather than multiple times on all scale layers, to reduce the memory and multiplier requirement for hardware implementation. A pixel s... View full abstract»

• ### Highly Reliable Two-Step Charge-Pump Read Scheme for 1.5 F2/Bit Nonlinear Sub-Teraohm 0TNR Vertical ReRAM

Publication Year: 2018, Page(s):1234 - 1238
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Among the emerging types of memory, resistive random-access memory (ReRAM) units offer faster write speeds and consume less power than those of flash memory units. With the advancement of 3-D stack technology, 3-D nonvolatile memories (NVMs) are under active development to satisfy the requirements of new applications. This brief proposes a 1.5 F2/bit nonlinear sub-teraohm vertical ReRAM... View full abstract»

• ### Operation of the Classical CMOS Schmitt Trigger As an Ultra-Low-Voltage Amplifier

Publication Year: 2018, Page(s):1239 - 1243
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In this brief, we analyze the operation of the classical Schmitt trigger (ST) circuit as an ultra-low-voltage (ULV) amplifier. Small-signal analysis is employed in order to determine optimum relative transistor sizes, which maximize the voltage gain. A comparison of the classical ST with the standard inverter highlights the relative benefits and drawbacks of each for operation as an amplifier in U... View full abstract»

## Aims & Scope

Part I will now contain regular papers focusing on all matters related to fundamental theory, applications, analog and digital signal processing. Part II will report on the latest significant results across all of these topic areas.

Full Aims & Scope

## Meet Our Editors

Editor-in-Chief

Chi K. Michael Tse
Dept. of Electronic and Information Engineering
Hong Kong Polytechnic University
Hunghom, Hong Kong
cktse@ieee.org