This paper proposes two fully-integrated cap-less (i. e. without external capacitor) preamplifiers for silicon microphones. Proper dc biasing of the preamplifier is obtained with two solutions to implement a large feedback resistance (in the GO range), based on a switched resistor and a transistor in the off state, respectively. Both solutions have been implemented in a 0.18-μm CMOS technology and consume 230 μW from a single 1.8-V power supply. Both preamplifiers achieve a flat frequency response between 20 Hz and 20 kHz with a programmable gain ranging from -6 dB to +18 dB, and an integrated input referred noise (IIRN) lower than -100 dBV. The achieved total harmonic distortion (THD) is lower than -100 dB and -80 dB for the switched-resistor and the off-transistor preamplifiers, respectively, independently of the gain and in spite of the single ended configuration.

Croce, M., De Berti, C., Crespi, L., Malcovati, P., Baschirotto, A. (2017). Cap-less audio preamplifiers for silicon microphones. In Proceedings of IEEE Sensors (pp.1-3). Institute of Electrical and Electronics Engineers Inc. [10.1109/ICSENS.2016.7808720].

Cap-less audio preamplifiers for silicon microphones

BASCHIROTTO, ANDREA
Ultimo
2017

Abstract

This paper proposes two fully-integrated cap-less (i. e. without external capacitor) preamplifiers for silicon microphones. Proper dc biasing of the preamplifier is obtained with two solutions to implement a large feedback resistance (in the GO range), based on a switched resistor and a transistor in the off state, respectively. Both solutions have been implemented in a 0.18-μm CMOS technology and consume 230 μW from a single 1.8-V power supply. Both preamplifiers achieve a flat frequency response between 20 Hz and 20 kHz with a programmable gain ranging from -6 dB to +18 dB, and an integrated input referred noise (IIRN) lower than -100 dBV. The achieved total harmonic distortion (THD) is lower than -100 dB and -80 dB for the switched-resistor and the off-transistor preamplifiers, respectively, independently of the gain and in spite of the single ended configuration.
paper
Electrical and Electronic Engineering
English
15th IEEE Sensors Conference, SENSORS 2016
2016
Proceedings of IEEE Sensors
9781479982875
2017
1
3
7808720
http://www.ieee.org/sensors
none
Croce, M., De Berti, C., Crespi, L., Malcovati, P., Baschirotto, A. (2017). Cap-less audio preamplifiers for silicon microphones. In Proceedings of IEEE Sensors (pp.1-3). Institute of Electrical and Electronics Engineers Inc. [10.1109/ICSENS.2016.7808720].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/153324
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