A 0.6-V 82-dB 28.6-mu W Continuous-Time Audio Delta-Sigma Modulator

作者：Zhang Jinghua^*; Lian Yong; Yao Libin; Shi Bo

来源：IEEE Journal of Solid-State Circuits, 2011, 46(10): 2326-2335.

DOI：10.1109/JSSC.2011.2161212

• CMOS technology
• continuous-time
• Delta-Sigma modulator
• low-power
• low-voltage

The design of a low-voltage low-power fourth-order single-bit continuous-time Delta-Sigma modulator is presented in this paper for audio applications. The modulator employs an input-feedforward topology in order to reduce internal signal swings, thus relaxes the linearity and slew rate requirements on amplifiers leading to low-voltage operation and low-power consumption. The energy efficiency is further improved by embedding the summation of feedforward paths into the quantizer. For low-voltage operation, a gain-enhanced fully-differential amplifier and a body-driven rail-to-rail input CMFB circuit are developed. The modulator, implemented in a 0.13-mu m standard CMOS technology with a core area of 0.11 mm(2), achieves an 82-dB dynamic range (DR), and a 79.1-dB peak signal-to-noise and distortion ratio (SNDR) over a 20-kHz signal bandwidth. The power consumption of the modulator is 28.6 mu W under a 0.6-V supply voltage. The achieved performance make it one of the best among state-of-the-art sub-1-V modulators in terms of two widely used figures of merit.

• 出版日期2011-10
• 单位昆明物理研究所