16位语音Δ-Σ调制器  

A 16-Bit Δ-Σ Modulator for Audio Application

作　　者：韩丹丹[1] 杨华中[1] 

机构地区：[1]清华大学电子工程系,清华信息国家实验室,北京100084

出　　处：《微电子学》2009年第4期520-524,共5页Microelectronics

基　　金：国家自然科学基金资助项目(90307016,90707002)

摘　　要：介绍了一个应用于G.712语音编码的16位2 MHz采样率Δ-Σ调制器(SDM),利用Matlab优化调制器系数,并采用全差分开关电容共模反馈两级跨导放大器和动态比较器降低功耗。模拟结果显示:在2 MHz采样时钟下,输入4 kHz语音信号可获得101 dB信噪比输出,相当于16位精度。电路采用0.18μm CMOS工艺实现,核心面积为340μm×160μm。电路在1.8 V工作电压和2 MHz采样率下,总功耗约165.6μW。A 16-bit 2 MS/s △-∑modulator （SMD） for audio application was presented according to G. 712 standard. Coefficients of the SDM was optimized with Matlab. Fully-differential switched-capacitor common-mode-feedback OTA and dynamic comparator were used to reduce power. Simulation results showed that, at 2 MHz sampling rate, the modulator achieved an SNR of 101 dB, or 16 effective numbers of bits, for 4 kHz input signals. The modulator was fabricated in 0. 18μm CMOS process, and the core circuit occupied an area of 340μm×160μm. Operating at 2 MHz sampling rate from 1.8 V supply power, the circuit consumes 165. 6μW of power.

关 键 词：Δ-Σ调制器 开关电容积分器 动态比较器 语音信号处理 

分 类 号：TN761[电子电信—电路与系统]