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
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;
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
DOI :
10.1109/MWSCAS.1995.510266
