Single_cell_microphone_amplifier

Published:2009/7/24 3:06:00 Author:Jessie | From:SeekIC

As shown, the circuit provides a voltage-gain of 60 dB over a 5-kHz bandwidth, loaded at 500 Ω. Unloaded, it is possible to get 60-dB gain up to 10 kHz. Input impedance is 10 kΩ. Notice that with a single cell, the output cannot swing much below 150 mV, nor closer than 800 mV to the supply. Input noise is 40 to 50 nV/√Hz (about equal to the op amp).



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