Title :
Integrated low voltage and low power CMOS circuits for optical sensing of diffraction based micromachined microphone
Author :
Qureshi, Muhammad Shakeel ; Basu, Arindam ; Bicen, B. ; Degertekin, L. ; Hasler, Paul
Author_Institution :
Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA, USA
fDate :
May 30 2010-June 2 2010
Abstract :
We present CMOS electronics for optical sensing of diffraction based micromachined microphone. Peak detector and track and hold circuits are used for continuous time approach with only 58 μA of current for 65dB peak SNR (lPa at 1kHz). We also present a 1-bit sigma delta interface ADC for directly digitizing the signal for digital processing with 63 μA of current for 62dB peak SNR (lPa @ 1kHz). The electronics are designed in 0.35um standard digital CMOS process with reduced supply of 1.5Volts. All the analog front end circuits operate in weak inversion with rail-to-rail wide input linear range.
Keywords :
CMOS digital integrated circuits; micromechanical devices; microphones; optical sensors; sigma-delta modulation; CMOS electronic; current 58 muA; current 63 muA; digital CMOS process; integrated low voltage circuit; low power CMOS circuit; micromachined microphone; optical sensing; peak detector; sigma delta interface ADC; size 0.35 mum; voltage 1.5 V; CMOS process; Circuits; Delta-sigma modulation; Detectors; Low voltage; Microphones; Optical diffraction; Optical sensors; Rail to rail inputs; Signal processing;
Conference_Titel :
Circuits and Systems (ISCAS), Proceedings of 2010 IEEE International Symposium on
Conference_Location :
Paris
Print_ISBN :
978-1-4244-5308-5
Electronic_ISBN :
978-1-4244-5309-2
DOI :
10.1109/ISCAS.2010.5537165
