Journal
IEEE JOURNAL OF SOLID-STATE CIRCUITS
Volume 51, Issue 7, Pages 1607-1618Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSSC.2016.2540811
Keywords
A/D converter; audio converter; continuous-time; MEMS microphone; Sigma Delta modulator
Categories
Ask authors/readers for more resources
This paper presents a low-power, high-performance continuous-time Sigma Delta modulator for MEMS microphones frontend. The Sigma Delta modulator 3rd-order loop filter has been implemented with a low-noise, power-optimized active-RC architecture that uses only two operational amplifiers. This solution, along with the use of a 15-level quantizer and of a feedback DAC with three-level current-steering elements, which minimizes the noise contribution for small input signals, allows achieving a DR larger than 100 dB, while consuming less than 0.5 mW, as required in always-running audio modules for portable devices. The proposed Sigma Delta modulator, realized in 0.16 mu m CMOS technology with an area of 0.21 mm(2), achieves 106 dB A-weighted DR and 91.3 dB peak SNDR, consuming 390 mu W from a 1.6 V power supply.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available