Isolation amplifier circuit

Details Isolation amplifier circuit Isolation amplifier circuit

1991-11-21

1993-03-02

Mottola, Steven

Amplifiers

Hum or noise or distortion bucking introduced into signal...

330124R, 381121, H03F 130, H03F 368

Patent

active

051912988

ABSTRACT:
A isolation amplifier circuit comprises: an operation amplifier provided with a first and second input terminals, an output terminal, and a feedback resistor for connecting the output terminal and second input terminal; a first emitter follower, for inputting a signal, connected to the first input terminal; a second emitter follower connected between the output terminal and the feedback resistor; a third emitter follower connected between the second input terminal and a first ground impedance; and a fourth emitter follower connected between the first input terminal and a second ground impedance. In the isolation circuit, dynamic resistances of the first, second, third, and fourth emitter followers are made identical with one another.

REFERENCES:
patent: 3394269 (1968-07-01), Miner
patent: 3947695 (1976-03-01), Silvia
patent: 4365207 (1982-12-01), Fukuchi
patent: 4378467 (1983-03-01), Ferrantelli
patent: 4801889 (1989-01-01), Fujisawa

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