Title :
A Realization of Low Noise Silicon Acoustic Transducer Interface Circuit
Author :
Hsu, Yu-Chun ; Chou, Wen-Chieh ; Liao, Lu-Po ; Tsai, Ji-Ching
Author_Institution :
ITRIS/Ind. Technol. Res. Inst., Chutung
Abstract :
An interface circuit dedicated for silicon acoustic transducer is presented. The circuit includes a transimpedance amplifier for the impedance matching between the acoustic sensor and the negative feedback amplifier along with a negative feedback amplifier with a fixed gain for pre-amplifying the acoustic signal. The input stage of the negative feedback amplifier is specially designed to satisfy sensor´s specifications and avoid low frequency noise. The circuit is implemented in a standard CMOS process, and measurements with a conventional silicon microphone are taken. The interface circuit achieves 20dB gain, and a SNR of 51dB with an A-weighted output noise of-119dBV. Results shown in this article validates the circuit designed.
Keywords :
CMOS integrated circuits; acoustic transducers; feedback amplifiers; impedance matching; preamplifiers; silicon; acoustic sensor; acoustic signal preamplification; impedance matching; low noise silicon acoustic transducer interface circuit; negative feedback amplifier; standard CMOS process; transimpedance amplifier; Acoustic noise; Acoustic sensors; Acoustic transducers; Circuit noise; Feedback amplifiers; Feedback circuits; Impedance matching; Low-frequency noise; Measurement standards; Silicon;
Conference_Titel :
VLSI Design, Automation and Test, 2007. VLSI-DAT 2007. International Symposium on
Conference_Location :
Hsinchu
Print_ISBN :
1-4244-0583-1
Electronic_ISBN :
1-4244-0583-1
DOI :
10.1109/VDAT.2007.372762
