Pre-amplifier

Details Pre-amplifier Pre-amplifier

1992-12-14

1994-08-09

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330156, 330300, 330311, 381120, H03F 345

Patent

active

053370112

ABSTRACT:
A tiny pre-amplifier for a small, low voltage, high impedance signal source, usually an electret microphone, exhibiting near unity gain, has an input cascode stage connected to the microphone and a matched balancing cascode stage; both cascode stages are energized from the same power supply circuit. The two cascode stages supply intermediate signals to the inputs of a differential amplifier to generate an output signal having a greatly reduced noise content, independent of power supply variations. The pre-amplifier is wholly integratable, has low power drain, and fits into the microphone housing.

REFERENCES:
patent: 3660772 (1972-05-01), Holt
patent: 3801933 (1974-04-01), Teare
patent: 3927383 (1975-12-01), Fjarlie et al.
patent: 4063050 (1977-12-01), Carlson et al.
patent: 4151480 (1979-04-01), Carlson et al.
patent: 5083095 (1992-01-01), Madaffari

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