Title :
A 470μA direct readout circuit for electret and MEMS digital microphones
Author :
Barbieri, Alan ; Nicollini, Germano
Author_Institution :
ST-Ericsson, Agrate Brianza, Italy
Abstract :
A direct readout circuit configurable for electret or MEMS digital microphones is presented. The circuit includes a transducer interface, a programmable preamplifier, a 4th order ΣΔ modulator, a bandgap reference, a clock detection circuit, and a stability recovery system. A prototype has been realized in a 0.25μm CMOS process, performing 63dBA SINAD at 1Pa, and a consumption of 470μA at 1.6V supply voltage.
Keywords :
CMOS integrated circuits; acoustic transducers; electrets; micromechanical devices; microphones; preamplifiers; readout electronics; reference circuits; sigma-delta modulation; CMOS process; MEMS digital microphones; bandgap reference; clock detection circuit; current 470 muA; direct readout circuit; electret; fourth order sigma-delta modulator; programmable preamplifier; size 0.25 mum; stability recovery system; transducer interface; voltage 6 V; Clocks; Electrets; Micromechanical devices; Microphones; Modulation; Noise; Preamplifiers;
Conference_Titel :
Electronics, Circuits, and Systems (ICECS), 2013 IEEE 20th International Conference on
Conference_Location :
Abu Dhabi
DOI :
10.1109/ICECS.2013.6815424
