# IEEE Transactions on Circuits and Systems II: Express Briefs

## Filter Results

Displaying Results 1 - 25 of 32

Publication Year: 2007, Page(s):C1 - C4
| PDF (41 KB)
• ### IEEE Transactions on Circuits and Systems—II: Express Briefs publication information

Publication Year: 2007, Page(s): C2
| PDF (37 KB)
• ### Editorial A Time for Balance

Publication Year: 2007, Page(s):1029 - 1031
| PDF (253 KB) | HTML
• ### Global Shutter CMOS Image Sensor With Wide Dynamic Range

Publication Year: 2007, Page(s):1032 - 1036
Cited by:  Papers (15)
| | PDF (537 KB) | HTML

A novel concept for global shutter CMOS image sensors with wide dynamic range (WDR) implementation is presented. The proposed imager is based on the multisampling WDR approach and it allows an efficient global shutter pixel implementation achieving small pixel size and high fill factor. The proposed imager provides wide DR by applying adaptive exposure time to each pixel, according to the local il... View full abstract»

• ### MIMO Series–Series Feedback Amplifiers

Publication Year: 2007, Page(s):1037 - 1041
Cited by:  Papers (4)
| | PDF (205 KB) | HTML

This brief defines a new type of multiple-input multiple-output (MIMO) amplifier. We present basic structures for this MIMO series-series feedback amplifier (MIMO-SSFA), and the basic design equations. We provide a detailed example showing how this MIMO-SSFA may be used as a transmitting circuit for multiconductor interconnections. View full abstract»

• ### A $pm$ 0.75-V Compact CMOS Class-AB Current-Mode Exponential Variable Gain Amplifier

Publication Year: 2007, Page(s):1042 - 1046
Cited by:  Papers (10)
| | PDF (449 KB) | HTML

In this brief, a novel class-AB implementation of a current-mode exponential variable gain amplifier (VGA) is presented. The VGA is based on a novel current amplifier circuit implemented by multicoupled MOS translinear loops operating in strong inversion and saturation. The gain is conveniently configured for performing a pseudo-exponential approximation leading to a very compact design since an e... View full abstract»

• ### A 1-V 50-MHz Pseudodifferential OTA With Compensation of the Mobility Reduction

Publication Year: 2007, Page(s):1047 - 1051
Cited by:  Papers (19)  |  Patents (1)
| | PDF (877 KB) | HTML

This brief presents a high-linearity operational transconductance amplifier (OTA) based on pseudodifferential structures. The linearity is improved by mobility compensation techniques as the device size is scaled down to achieve high speed operation. Transconductance tuning could be achieved by a MOS operating in the linear region. The OTA fabricated in the 0.18-mum CMOS process occupies a small a... View full abstract»

• ### Low-Power and Compact CMOS APS Circuits for Hybrid Cryogenic Infrared Fast Imaging

Publication Year: 2007, Page(s):1052 - 1056
Cited by:  Papers (12)
| | PDF (1059 KB) | HTML

This brief presents a complete set of CMOS basic building blocks for low-cost scanning infrared (IR) cryogenic imagers. Low-power and compact novel circuits are proposed for single-capacitor integration and correlated double sampling, embedded pixel test, pixel charge-multiplexing and video composition and buffering. In order to validate the new basic building blocks, experimental results are repo... View full abstract»

• ### A Gray-Level Dependent Pre-Emphasis Column Driver With Fast Settling for Active-Matrix LCD Applications

Publication Year: 2007, Page(s):1057 - 1061
Cited by:  Papers (2)  |  Patents (3)
| | PDF (840 KB) | HTML

In this brief, simple analytical solutions for pre-emphasis driving conditions in active-matrix liquid crystal display (AMLCD) applications are presented. According to the solutions presented, the column driver with a gray-level dependent pre-emphasis (GLDP) function is designed for fast settling. The GLDP column driver is implemented without using additional frame memory. Also, modifications to t... View full abstract»

• ### A New IIP2 Enhancement Technique for CMOS Down-Converter Mixers

Publication Year: 2007, Page(s):1062 - 1066
Cited by:  Papers (9)
| | PDF (381 KB) | HTML

The design of a CMOS mixer for cellular phone and 3G applications is challenging because of tough linearity and noise requirements. A new technique for second-order input intercept point (IIP2) enhancement of CMOS down-converter mixers is introduced in this brief. The technique is based on canceling second-order intermodulation components generated in input pseudodifferential transconductor, by in... View full abstract»

• ### A “Flying-Adder” On-Chip Frequency Generator for Complex SoC Environment

Publication Year: 2007, Page(s):1067 - 1071
Cited by:  Papers (21)  |  Patents (1)
| | PDF (535 KB) | HTML

The spirit of system-on-chip (SoC) approach is to integrate more and more system functions into one single chip. Consequently, the on-chip clock requirement could be very complicated due to the various functions the chip has to support. To fulfill those clock needs, it is not uncommon for more than several phase-locked loop (PLLs) to be used within one such large chip. Designing these on-chip PLLs... View full abstract»

• ### A DLL-Based Variable-Phase Clock Buffer

Publication Year: 2007, Page(s):1072 - 1076
Cited by:  Papers (5)
| | PDF (993 KB) | HTML

A variable-phase clock buffer that uses a delay-locked loop (DLL) is presented. The variable-phase clock is achieved by switching the multiphase outputs of the divider in the DLL. The output phase is adjustable in a step of where pi/n is the ratio of two voltage-controlled delay lines in the proposed circuit. The prototype has been fabricated in a 0.18- CMOS process to realize the output phases of... View full abstract»

• ### A Reconfigurable Accelerator for Smith–Waterman Algorithm

Publication Year: 2007, Page(s):1077 - 1081
Cited by:  Papers (25)
| | PDF (388 KB) | HTML

Scanning bio-sequence database and finding similarities among DNA and protein sequences is basic and important work in bioinformatics field. To solve this problem, Needleman-Wunschh (NW) algorithm is a classical and precise tool, and Smith-Waterman (SW) algorithm is more practical for its capability to find similarities between subsequences. Such algorithms have computational complexity proportion... View full abstract»

• ### Bit-Stream Adders and Multipliers for Tri-Level Sigma–Delta Modulators

Publication Year: 2007, Page(s):1082 - 1086
Cited by:  Papers (11)  |  Patents (2)
| | PDF (199 KB) | HTML

We propose both adder and multiplier circuits for bit-stream signal processing customized for tri-level sigma-delta modulated signals. These architectures are the 2-bit extensions from the existing 1-bit bit-stream adders and multipliers, and are shown to offer better signal-to-noise performance. Field-programmable gate array implementations then confirm their efficacy. View full abstract»

• ### Adaptive Regularization Matrix for Affine Projection Algorithm

Publication Year: 2007, Page(s):1087 - 1091
Cited by:  Papers (23)
| | PDF (710 KB) | HTML

We propose an adaptive regularized affine projection algorithm (AR-APA) with a regularization matrix. Instead of the conventional fixed and weighted identity matrix for regularization, the proposed AR-APA incorporates a nonidentity regularization matrix which is dynamically updated. The adaptation of the regularization matrix is accomplished by the normalized stochastic gradient of mean-square err... View full abstract»

• ### A Low-Complexity $L_{infty}$-Norm Adaptive Filtering Algorithm

Publication Year: 2007, Page(s):1092 - 1096
Cited by:  Papers (3)
| | PDF (244 KB) | HTML

We present a low-complexity minimum Linfin-norm adaptive filtering algorithm with sparse updates. A new constrained minimization problem based on the minimum disturbance in the Linfin-norm sense is developed. Solving this minimization problem gives birth to an efficient algorithm which decreases the number of updates as well as the complexity per each iteration. Experimental ... View full abstract»

• ### A Linear Phase Condition for Volterra Filters

Publication Year: 2007, Page(s):1097 - 1101
| | PDF (1569 KB) | HTML

In linear finite-impulse-response filter design, it is desirable that the filter frequency response has linear phase (LP). In this brief, we investigate the LP concept for nonlinear Volterra filters. The LP condition of Volterra filters is defined in terms of its output spectrum in which the phase term introduced by the Volterra kernels is linear. It is shown that under certain symmetry conditions... View full abstract»

• ### On the Asymptotic Stability of Positive 2-D Systems Described by the Roesser Model

Publication Year: 2007, Page(s):1102 - 1104
Cited by:  Papers (12)
| | PDF (90 KB) | HTML

This brief investigates the asymptotic stability of positive 2D systems described by the Roesser model. A necessary and sufficient condition is derived for the asymptotic stability, which amounts to checking the spectrum radius of the system matrix. Furthermore, it can be shown that the asymptotic stability of positive 2D systems is equivalent to that of the traditional 1D systems. This observatio... View full abstract»

• ### Mathematical Analysis of a Prime Modulus Quantizer MASH Digital Delta–Sigma Modulator

Publication Year: 2007, Page(s):1105 - 1109
Cited by:  Papers (23)
| | PDF (607 KB) | HTML

A MASH digital delta-sigma modulator (DDSM) is analyzed mathematically. It incorporates first-order error feedback modulators (EFM) which include prime modulus quantizers to guarantee a minimum sequence length M. The purpose of this analysis is to calculate the exact sequence length of the aforementioned MASH DDSM. We show that the sequence length for an lth-order member of this modulator family M... View full abstract»

• ### Switch-Controllable OTRA-Based Square/Triangular Waveform Generator

Publication Year: 2007, Page(s):1110 - 1114
Cited by:  Papers (20)
| | PDF (806 KB) | HTML

A switch-controllable square/triangular waveform generator is presented. The circuit consists mainly of two operational transresistance amplifiers and three switches. The dc level of the triangular signal can be adjusted. Both inverting and noninverting mode operations can be fulfilled. A prototype circuit is implemented and experimental results are recorded to demonstrate its feasibility. View full abstract»

• ### Robust Global Exponential Stability for Interval Reaction–Diffusion Hopfield Neural Networks With Distributed Delays

Publication Year: 2007, Page(s):1115 - 1119
Cited by:  Papers (38)
| | PDF (165 KB) | HTML

This brief presents a sufficient condition for the existence, uniqueness, and robust global exponential stability of the equilibrium solution for a class of interval reaction diffusion Hopfield neural networks with distributed delays and Dirichlet boundary conditions by constructing suitable Lyapunov functional and utilizing some inequality techniques. The result imposes constraint conditions on t... View full abstract»

• ### Quantization Effects in All-Digital Phase-Locked Loops

Publication Year: 2007, Page(s):1120 - 1124
Cited by:  Papers (25)  |  Patents (3)
| | PDF (230 KB) | HTML

This brief analyzes the impact of the quantization noise sources in all-digital phase-locked loops (ADPLLs), recently employed as frequency synthesizers. In general, the in-band phase noise is not only caused by the phase quantization of the time-to-digital converter, but also by the frequency quantization of the digitally controlled oscillator (DCO). The delta-sigma modulator placed at the DCO in... View full abstract»

• ### Analysis of Integrator Nonlinearity in a Class of Continuous-Time Delta–Sigma Modulators

Publication Year: 2007, Page(s):1125 - 1129
Cited by:  Papers (16)
| | PDF (250 KB) | HTML

We analyze the effect of nonlinearity in the first integrator of a single-loop multibit continuous-time delta-sigma modulator, when the loop filter is of the cascade of integrators with feedforward kind. When a multibit quantizer is used in the loop, we show that integrator nonlinearity results in an increased in-band noise (IBN) floor. We develop analytical relations for the IBN spectral density ... View full abstract»

• ### Cort-X II: The Low-Power Element Design for a Dynamic Neural Network

Publication Year: 2007, Page(s):1130 - 1134
Cited by:  Papers (1)  |  Patents (1)
| | PDF (804 KB) | HTML

The parametrically coupled logistic map network (PCLMN) can serve as the front-end dynamic neural network (DNNs) for clustering and generation of spatio-temporal patterns. In this brief, the element of the PCLMN is designed in a 0.25-mum 2.5-V CMOS process for low power consumption. The analog design employs self-calibration techniques to improve the accuracy of the low-power element. After calibr... View full abstract»

• ### IIP2 Calibration by Injecting DC Offset at the Mixer in a Wireless Receiver

Publication Year: 2007, Page(s):1135 - 1139
Cited by:  Papers (15)  |  Patents (4)
| | PDF (200 KB) | HTML

A major contributor to degraded input-referred second-order intercept point (IIP2) in integrated RF systems-on-chips is local oscillator (LO) leakage to the input of RF circuits. In this brief, we present a digital calibration technique for improving IIP2 by injecting controlled dc offset at the mixer output through a three-port network of switched-capacitor filters. The dc offset at mixer output ... 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