IEEE Transactions on Circuits and Systems I: Regular Papers

In negative-feedback amplifier design, electromagnetic interference (EMI) behavior is usually completely disregarded. EMI can, e.g., result in detection of low-frequency envelope variations of the usually high-frequency interfering signals. If the detected signals end up in the pass band of the negative-feedback amplifier, they cannot be distinguished from the intended signal any longer, so the si... View full abstract»

A transient charge feedforward driver (TCFD) is presented for high-speed current-mode data driving in active-matrix organic LED (AMOLED) displays. In order to provide charging current for the parasitic capacitance of a column line (CL), TCFD adaptively generates the required charging current by taking advantage of the parasitic capacitance of another adjacent CL. The TCFD can dramatically enhance ... View full abstract»

This paper presents the design of a time-to-digital converter (TDC) suitable for a 3.5-GHz all-digital phase-lock loop (PLL). The converter is based on a digital bang-bang delay-lock loop, which allows constant resolution over process and temperatures spreads, avoids an off-chip filter and guarantees fast lock. The clock rate of the digital filter is scaled down by eight from the 3.5-GHz input to ... View full abstract»

Self-powered monitoring refers to a signal processing technique where the computational power is harvested directly from the signal being monitored. In this paper, we present the design and calibration of a CMOS event counter for long-term, self-powered mechanical usage monitoring. The counter exploits a log-linear response of the hot-electron injection process on a floating-gate transistor when b... View full abstract»

In this paper, a power-efficient 16<i>times</i> 16 configurable Booth multiplier (CBM) that supports single 16-b, single 8-b, or twin parallel 8-b multiplication operations is proposed. To efficiently reduce power consumption, a novel dynamic-range detector is developed to dynamically detect the effective dynamic ranges of two input operands. The detection result is used to not only pi... View full abstract»

Reed-Solomon (RS) codes are used as error-correcting codes in numerous digital communication and storage systems. Algebraic soft-decision decoding (ASD) of RS codes can achieve substantial coding gain with polynomial complexity. Among practical ASD algorithms, the iterative bit-level generalized minimum distance (BGMD) decoding can achieve similar or higher coding gain with lower complexity. The i... View full abstract»

<para> Distributed arithmetic (DA)-based computation is popular for its potential for efficient memory-based implementation of finite impulse response (FIR) filter where the filter outputs are computed as inner-product of input-sample vectors and filter-coefficient vector. In this paper, however, we show that the look-up-table (LUT)-multiplier-based approach, where the memory elements store ... View full abstract»

In this paper, we present a framework for constructing ΣΔ learning algorithms and hardware that can identify and track low-dimensional manifolds embedded in a high-dimensional analog signal space. At the core of the proposed approach is a min-max stochastic optimization of a regularized cost function that combines machine learning with ΣΔ modulation. As a result, the algorithm not only produces a ... View full abstract»

The impact of high-order integrator dynamics on switched-capacitor sigma-delta modulator (¿¿M) performances is investigated in this paper. An advanced generic integrator-settling model to take into account high-order dynamic effects is presented and validated by means of transistor-level simulations of circuits implemented in a commercial 0.35 ¿m CMOS technology. The model is used through the pape... View full abstract»

A digital phase-locked loop (DPLL) has been recently developed to exploit the increasing transistor speed of modern process technology. By employing a digitally controlled oscillator (DCO) and a time-to-digital converter (TDC), the loop filter of a DPLL becomes all-digital. Instead of designing the loop filter by digitizing a continuous-time loop response as has been commonly done, more sophistica... View full abstract»

We show that the Lorentzian spectrum of a free-running LC oscillator arises from the random pulling of its frequency by circuit noise sources. To prove this, we analyze the oscillator's spectrum using Adler's differential equation, first in response to pulling by a single injected tone and then by two tones mirrored around the free-run frequency. A novel analysis predicts the frequencies and ampli... View full abstract»

<para> This paper adopts a phase-domain macromodel based on perturbation projection vector to study the synchronization effects that take place between two weakly coupled oscillators. Original closed-form expressions for the locking region of the coupled oscillators and for the common locking frequency are derived. The route to synchronization is described analytically by predicting the osci... View full abstract»

<para> To achieve efficient blind source extraction (BSE) from noisy mixtures, we propose a noisy component extraction (NoiCE) algorithm that combines standard BSE and a cascaded nonlinear adaptive estimator. There are no assumptions of statistical independence, and also as a byproduct of BSE after deflation, we may also obtain asymptotic identification of the <emphasis emphasistype="ital... View full abstract»

<para> This paper presents some low-dimensional pinning criteria for global synchronization of both directed and undirected complex networks, and proposes specifically pinning schemes to select pinned nodes by investigating the relationship among pinning synchronization, network topology, and the coupling strength. The paper answers the challenging questions in pinning control of complex net... View full abstract»

<para> The high complexity and time-varying workload of emerging multimedia applications poses a major challenge for dynamic voltage scaling (DVS) algorithms. Although many DVS algorithms have been proposed for real-time applications, an efficient method for evaluating the optimality of such DVS algorithms for multimedia applications does not yet exist. In this paper, we propose the first of... View full abstract»

This paper addresses a global robust adaptive control problem for a class of uncertain nonlinear systems by output feedback control. The problem will be solved by the internal model design method. As our problem formulation includes the chaotic control and synchronization problem of some typical nonlinear systems as special cases, a direct application of our main result will lead to the solu... View full abstract»

In this paper, a very efficient semi-blind approach for the detection of most significant taps (MSTs) in sparse orthogonal frequency-division multiplexing (OFDM) channel estimation is developed. The least square (LS) estimation problem of sparse OFDM channels is first formulated, showing that the key to sparse channel estimation lies in the detection of the MSTs. An in-depth study of the sec... View full abstract»

<para> This paper presents a novel architecture for wireless communication systems made up of a base station and a remotely powered transponder. The architecture enables the base station to perform wireless voltage regulation (WVR) of the rectifier's output voltage in the transponder. This new regulation technique can be embedded in any system, provided that the passive transponder uses an I... View full abstract»

<para> A design methodology for watt-level, fully integrated CMOS power amplifiers (PAs) is presented. It is based on the analysis of the operation and power loss mechanism of class-E PAs, which includes the effects of a finite dc-feed inductance and an impedance matching transformer. Using the proposed approach, a class-E PA with a 2 <formula formulatype="inline"><tex Notation="TeX... View full abstract»