文章基本信息

标题：A Hybrid Audio ${\Delta}{\Sigma}$ Modulator with dB-Linear Gain Control Function
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作者：Kim, Yi-Gyeong ; Cho, Min-Hyung ; Kim, Bong-Chan 等
期刊名称：ETRI Journal
印刷版ISSN：1225-6463
电子版ISSN：2233-7326
出版年度：2011
卷号：33
期号：6
页码：897-903
DOI：10.4218/etrij.11.0111.0293
语种：English
出版社：Electronics and Telecommunications Research Institute
摘要：A hybrid modulator for audio applications is presented in this paper. The pulse generator for digital-to-analog converter alleviates the requirement of the external clock jitter and calibrates the coefficient variation due to a process shift and temperature changes. The input resistor network in the first integrator offers a gain control function in a dB-linear fashion. Also, careful chopper stabilization implementation using return-to-zero scheme in the first continuous-time integrator minimizes both the influence of flicker noise and inflow noise due to chopping. The chip is implemented in a 0.13 CMOS technology (I/O devices) and occupies an active area of 0.37 . The modulator achieves a dynamic range (A-weighted) of 97.8 dB and a peak signal-to-noise-plus-distortion ratio of 90.0 dB over an audio bandwidth of 20 kHz with a 4.4 mW power consumption from 3.3 V. Also, the gain of the modulator is controlled from -9.5 dB to 8.5 dB, and the performance of the modulator is maintained up to 5 nsRMS external clock jitter.
关键词：Delta-sigma modulator;hybrid delta-sigma odulator;chopper stabilization (CHS);return-to-zero (RZ) DAC;RZ DAC;RTZ DAC;programmable gain amplifier (PGA);dB-linear