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This paper presents a power gating design that considers process variation for proper wakeup control. First, the surge current constraint is examined and refined for a simpler and more realistic view of inter-module reliability. Following that, several circuits are proposed on top of a delay chain to adapt the timing control of power switches to process variations. Experimental results show that the...
During recent years, the success of live swarm-based P2P streaming system has been witnessed. Nevertheless, how to design an effective mechanism for mitigating video quality degradation in a lossy network environment is still not thoroughly resolved yet. Unlike conventional client-server paradigm, there is data availability problem in swarm-based P2P streaming system. If we directly conduct the importance-first...
A W-band monolithic direct conversion receiver for passive millimeter wave imaging system using commercial 0.15 µm GaAs pHEMT technology has been realized. The receiver module consists of a two-stage preamplifier, a zero bias detector and an low pass filter. The input return loss S11 over W-band was measured, and the estimated noise equivalent power (NEP) of the detector showed the value of 7.8 pW/√Hz...
Novel designs for high-efficiency millimeter wave zero-bias detectors are presented. As the renowned backward diodes are extensively exploited in the utilization of zero bias detectors due to its preferable conduction for small reverse biases, the single-handed diode detectors reveal its inherent capabilities by the semiconductor processes which the detectors are made from. The selected process chiefly...
In this paper, we present an efficient chip for the removal of impulse noise in images. Our design uses a mask on each pixel in the image to determine whether it is likely being corrupted by random-valued impulse noise or not. After noise detection, we reconstruct the noisy pixel by considering the possible edges existed in the mask and applying a median filter on it. The memory requirement of the...
As magnetic recording densities grow, the nonlinear distortions, known as transition shift and partial erasure, arise and limit the performance of the detector. Despite that the transition shift can be compensated by a write current technique, the effect of partial erasure complicates the evaluation of the correlation functions for the storage data and the nonreturn-to-zero-inverted modulated data...
Otsupsilas thresholding method (OTM) is one of the most commonly used thresholding methods. Unfortunately, the threshold obtained by OTM is biased in favor of the class, whose standard deviation or quantity of data is larger. Besides, one may adopt distinct thresholds in different applications for a same data set. Accordingly, this paper proposes an adaptable threshold decision method (ATDM) to provide...
As magnetic recording density grows, the nonlinear distortions, known as transition shift and partial erasure,arise and limit the performance of the detector. In designing a detector, a phase detector is required to estimate the timing error in a timing recovery loop; the Muller & Mueller's phase detector is often adopted for its simple realization. In this article, we focus on the characteristics...
Nonlinear effects arise in the high-density magnetic recording, which causes a performance degradation of the corresponding detector. Design of the timing recovery is crucial for the detector, and it becomes complicated in the presence of the nonlinear effects. In this article, we examine the effects of the Muller & Mueller's phase detector for a nonlinear magnetic recording channel. For simplicity,...
We propose a more accurate method to analyze multilevel frequency-shift-keying frequency-hopping code-division multiple-access (MFSK/FH-CDMA) wireless communication systems using ldquoone-hitrdquo FH patterns, instead of random FH patterns. By also removing the over-optimistic symbol-synchronous assumption, the new method provides a more realistic performance analysis as the MFSK modulation may result...
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