DocumentCode
2207619
Title
Low frequency amplifiers for electret microphones
Author
Silva-Martinez, José ; Suñer, Jorge Salcedo
Author_Institution
Inst. Nacional de Astrofisica, Opt. y Electron., Puebla, Mexico
Volume
2
fYear
1995
fDate
13-16 Aug 1995
Firstpage
1018
Abstract
In this paper two preamplifiers for capacitive sources are proposed. The topologies present very low distortion components (THD<1%), low offset voltages (less than 40 mvolts at the output) and low noise (less than 30 μvRMS) The dynamic range of the topologies, is 57 dB and 63 dB, respectively. The power consumption is 21 μwatts for the first topology and 10 μwatts for the second one. The supply voltages employed are ±1.5 volts
Keywords
CMOS analogue integrated circuits; audio-frequency amplifiers; microphones; operational amplifiers; preamplifiers; -1.5 V; 1.5 V; 10 muW; 21 muW; CMOS IC; LF preamplifiers; OTA; capacitive sources; electret microphones; low frequency amplifiers; Electrets; Equations; Frequency; Harmonic distortion; Microphones; Preamplifiers; Resistors; Threshold voltage; Topology; Transconductance;
fLanguage
English
Publisher
ieee
Conference_Titel
Circuits and Systems, 1995., Proceedings., Proceedings of the 38th Midwest Symposium on
Conference_Location
Rio de Janeiro
Print_ISBN
0-7803-2972-4
Type
conf
DOI
10.1109/MWSCAS.1995.510266
Filename
510266
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