IEEE Transactions on Circuits and Systems I: Regular Papers

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Publication Year: 2013, Page(s):C1 - C4
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• IEEE Transactions on Circuits and Systems - I: Regular Papers publication information

Publication Year: 2013, Page(s): C2
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• A Three-State Signal Coding Scheme for High Efficiency Class-S Amplifiers

Publication Year: 2013, Page(s):1681 - 1691
Cited by:  Papers (2)
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A three-state signal coding scheme is proposed for driving Class-S amplifiers with higher efficiency than conventional techniques. The approach is formulated in the framework of polar modulation, where the magnitude is controlled by a timing code that specifies positive and negative rectangular pulses as well as a third zero state, and the phase is varied by modulating the clock delay. In particul... View full abstract»

• A 0.007-mm2 108-${rm ppm}/^{circ } {rm C}$ 1-MHz Relaxation Oscillator for High-Temperature Applications up to 180 $^{circ } {rm C}$ in 0.13-$mu {rm m}$ CMOS

Publication Year: 2013, Page(s):1692 - 1701
Cited by:  Papers (17)
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Reliable high-temperature CMOS oscillators are required for clock or time-base generation in several applications including data acquisition for aerospace, automotive control, oil field instrumentation, and pulp and paper digesters. In this paper, we present low-complexity resistive and capacitive temperature-compensation techniques for CMOS relaxation oscillators. In such oscillators, the frequen... View full abstract»

• A Reconfigurable Direct RF Receiver With Jitter Analysis and Applications

Publication Year: 2013, Page(s):1702 - 1711
Cited by:  Papers (3)
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In typical direct radio frequency (RF) sampling receivers, the sample clock jitter results in SNR degradation on received signals that increases log linearly with RF signal frequency. De-jittering received signals is computationally expensive, especially for wideband communications signals, because the induced jitter on received signals varies as a function of RF signal frequency. This paper consi... View full abstract»

• Analysis and Design of Superharmonic Injection-Locked Multipath Ring Oscillators

Publication Year: 2013, Page(s):1712 - 1725
Cited by:  Papers (4)
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Frequency dividers can be modeled as superharmonic injection-locked oscillators. We propose a general model for ring-oscillator based dividers. Theoretically, the maximum division frequency of a frequency divider can be decoupled from the number of phases at its output when multipath coupling of ring oscillators is used. Accurate expressions for the locking range are derived that are used to find ... View full abstract»

• An 8-Bit Single-Ended Ultra-Low-Power SAR ADC With a Novel DAC Switching Method and a Counter-Based Digital Control Circuitry

Publication Year: 2013, Page(s):1726 - 1739
Cited by:  Papers (19)  |  Patents (1)
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This paper proposes a design of ultra-low-power successive approximation register (SAR) analog-to-digital converters (ADC) specially optimized for very low frequency biosensor applications. Two new techniques are introduced: 1) a novel digital-to-analog converter (DAC) switching method suitable for single-ended SAR ADCs; and 2) a counter-based digital control circuitry. The DAC switching method us... View full abstract»

• A Describing Function Study of Saturated Quantization and Its Application to the Stability Analysis of Multi-Bit Sigma Delta Modulators

Publication Year: 2013, Page(s):1740 - 1752
Cited by:  Papers (3)
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Just as their single-bit counterparts, multi-bit sigma delta modulators exhibit nonlinear behavior due to the presence of the quantizer in the loop. In the multi-bit case this is caused by the fact that any quantizer has a limited output range and hence gives an implicit saturation effect. Due to this, any multi-bit modulator is prone to modulator overloading. Unfortunately, until now, designers h... View full abstract»

• Design of CML Ring Oscillators With Low Supply Sensitivity

Publication Year: 2013, Page(s):1753 - 1763
Cited by:  Papers (8)
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The causes of supply noise-induced frequency variation in CML ring oscillators are investigated and a novel circuit topology that reduces the supply sensitivity is presented. It is shown that this technique causes only a slight reduction in the maximum oscillation frequency and maintains nearly the same random jitter generation while greatly reducing the sinusoidal jitter caused by power supply va... View full abstract»

• Energy Efficient Low-Noise Multichannel Neural Amplifier in Submicron CMOS Process

Publication Year: 2013, Page(s):1764 - 1775
Cited by:  Papers (29)
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This paper presents a low noise low power neural recording amplifier that occupies a very small silicon area and is suitable to integrate with multielectrode arrays in cortical implants. We analyze main problems in neural recording systems processed in modern submicron technologies, i.e., leakage currents, ability to obtain very large and precisely controlled MOS based resistances and spread of th... View full abstract»

• Oscillator Instability Effects in Time Interval Measurement

Publication Year: 2013, Page(s):1776 - 1786
Cited by:  Papers (2)
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State-of-the-art TDCs can have a precision close to one picosecond, for which reason clock instability is starting to be one of the most significant factor limiting the precision. This paper provides methods to estimate clock jitter induced error by phase noise PSD measurements. Due to the different noise processes of the power-law model, convergence problems might restrict the time domain convers... View full abstract»

• A Bounded and Discretized Nelder-Mead Algorithm Suitable for RFIC Calibration

Publication Year: 2013, Page(s):1787 - 1799
Cited by:  Papers (4)
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This paper describes a calibration technique for noisy and nonconvex circuit responses based on the Nelder-Mead direct search algorithm. As Nelder-Mead is intended for unconstrained optimization problems, we present an implementation of the algorithm which is suitable for bounded and discretized RFIC calibration problems. We apply the proposed algorithm to the problem of spurious tone reduction vi... View full abstract»

• A Noise-Immune High-Speed Readout Circuit for In-Cell Touch Screen Panels

Publication Year: 2013, Page(s):1800 - 1809
Cited by:  Papers (17)  |  Patents (1)
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Delta-Integration, a novel readout method, is introduced in an effort to solve the noise and speed issues impeding the performance of in-cell touch screen panels. In the proposed method, a differential sensing scheme effectively cancels common noise components and locally occurring noise is spatially low-pass filtered. Due to the consequently enhanced Signal- to-Noise Ratio, the proposed scheme is... View full abstract»

• A 2-Kb One-Time Programmable Memory for UHF Passive RFID Tag IC in a Standard 0.18 /spl mu/m CMOS Process

Publication Year: 2013, Page(s):1810 - 1822
Cited by:  Papers (8)
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We present a 2-Kb one-time programmable (OTP) memory for UHF RFID applications. The OTP memory cell is based on a two-transistor (2-T) gate-oxide anti-fuse (AF) for low voltage operation. Reliability of memory cell is enhanced by limiting the maximum terminal voltages of thin-oxide and thick-oxide transistors to 1.8 V and 3.3 V, respectively. Improved low power circuit design techniques are used i... View full abstract»

• Moving Horizon Estimation for Networked Systems With Quantized Measurements and Packet Dropouts

Publication Year: 2013, Page(s):1823 - 1834
Cited by:  Papers (28)
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This paper is concerned with the moving horizon estimation (MHE) problem for linear discrete-time systems with limited communication, including quantized measurements and packet dropouts. The measured output is quantized by a logarithmic quantizer and the packet dropout phenomena is modeled by a binary switching random sequence. The main purpose of this paper is to design an estimator such that, f... View full abstract»

• Fast Time-Recursive Block Correlators for Pseudorandom Sequences

Publication Year: 2013, Page(s):1835 - 1844
Cited by:  Papers (2)
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Correlators for pseudorandom sequences are used in direct sequence spread spectrum communication systems for signal synchronization and identification of transmitters. Implementation aspects of these correlators are critical for real-time processing of signals. This paper presents fast correlator structures in time domain which significantly reduce redundant operations using time-recursive and blo... View full abstract»

• Low-Complexity Maximally-Decimated Multirate 3-D Spatio-Temporal FIR Cone and Frustum Filters

Publication Year: 2013, Page(s):1845 - 1856
Cited by:  Papers (8)
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A low-complexity multirate 3-D spatio-temporal FIR cone and frustum filter structure is proposed having potential applications as a spatio-temporal directional filter. The cone filter structure employs a 1-D modified discrete Fourier transform (DFT) filter bank and 2-D spatial filters. The frustum filter having a double-frustum-shaped passband oriented along the temporal frequency axis is approxim... View full abstract»

• A 2.0 Gb/s Throughput Decoder for QC-LDPC Convolutional Codes

Publication Year: 2013, Page(s):1857 - 1869
Cited by:  Papers (13)  |  Patents (2)
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This paper proposes a decoder architecture for low-density parity-check convolutional code (LDPCCC). Specifically, the LDPCCC is derived from a quasi-cyclic (QC) LDPC block code. By making use of the quasi-cyclic structure, the proposed LDPCCC decoder adopts a dynamic message storage in the memory and uses a simple address controller. The decoder efficiently combines the memories in the pipelining... View full abstract»

• Probe Based Shooting Method to Find Stable and Unstable Limit Cycles of Strongly Nonlinear High-q Oscillators

Publication Year: 2013, Page(s):1870 - 1880
Cited by:  Papers (3)
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Probe insertion technique is considered as an exclusively frequency domain approach. It has been developed to increase robustness of the harmonic balance method, when simulating autonomous circuits to avoid the dc degenerate solution. This technique evidences several good properties, for instance when simulating oscillators either employing high quality factor resonators or ac coupled ones. In thi... View full abstract»

• Semi-Global Leader-Following Consensus of Linear Multi-Agent Systems With Input Saturation via Low Gain Feedback

Publication Year: 2013, Page(s):1881 - 1889
Cited by:  Papers (172)
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This paper investigates the problem of leader-following consensus of a linear multi-agent system on a switching network. The input of each agent is subject to saturation. Low gain feedback based distributed consensus protocols are developed. It is established that, under the assumptions that each agent is asymptotically null controllable with bounded controls and that the network is connected or j... View full abstract»

• A Multiobjective Approach for Source Estimation in Fuzzy Networked Systems

Publication Year: 2013, Page(s):1890 - 1900
Cited by:  Papers (9)
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In this paper, fuzzy networked systems with a randomly varying delay and quantization errors are considered to represent signal transmission systems of nonlinearly interactive sources. A source estimation scheme is proposed by using a multiobjective approach, addressing the concerns of estimation errors and transmission power consumption. A mixed H2/H∞ de... View full abstract»

• Efficiency Optimization for Burst-Mode Multilevel Radio Frequency Transmitters

Publication Year: 2013, Page(s):1901 - 1914
Cited by:  Papers (10)
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The utilization of a burst-mode power amplifier (PA) together with pulse-width modulation (PWM) is a promising concept for achieving high efficiency in radio frequency (RF) transmitters. Nevertheless, such a transmitter architecture requires bandpass filtering to suppress side-band spectral components to retrieve the wanted signal, which reduces the transmit power and the transmitter efficiency. H... View full abstract»

• Least-Squares Phase Predistortion of a +30 dBm Class-D Outphasing RF PA in 65 nm CMOS

Publication Year: 2013, Page(s):1915 - 1928
Cited by:  Papers (9)
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This paper presents a model-based phase-only predistortion method suitable for outphasing radio frequency (RF) power amplifiers (PA). The predistortion method is based on a model of the amplifier with a constant gain factor and phase rotation for each outphasing signal, and a predistorter with phase rotation only. Exploring the structure of the outphasing PA, the model estimation problem can be re... View full abstract»

• Optical Receiver Using Noise Cancelling With an Integrated Photodiode in 40 nm CMOS Technology

Publication Year: 2013, Page(s):1929 - 1936
Cited by:  Papers (12)
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A transimpedance amplifier (TIA) based on an inverting voltage amplifier with a shunt feedback resistor using a noise cancelling technique is presented. The TIA is followed by two stages of differential limiting amplifiers and the last stage is a 50 Ω differential output driver to provide an interface to the measurement setup. The TIA shows a measured optical sensitivity of -20.7 dBm for a ... View full abstract»

• A Linear Programming Based Tone Injection Algorithm for PAPR Reduction of OFDM and Linearly Precoded Systems

Publication Year: 2013, Page(s):1937 - 1945
Cited by:  Papers (6)
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This work investigates the improvement of power amplifier efficiency through the reduction of peak-to-average power ratio (PAPR) of linearly precoded QAM data signals. In particular, we focus on the special cases of linear precoded modulation including the practical OFDM, OFDMA, and SC-FDMA signals that have been widely adopted in W-LAN and W-MAN. We apply the method of tone injection optimization... View full abstract»

Aims & Scope

The theory, analysis, design, and practical implementations of circuits, and the application of circuit techniques to systems and to signal processing.

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Meet Our Editors

Editor-in-Chief
Andreas Demosthenous
Dept. Electronic & Electrical Engineering
University College London
London WC1E 7JE, UK