Isolating differential amplifier

Details Isolating differential amplifier Isolating differential amplifier

1978-03-01

1979-08-07

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330 59, 330308, H03F 1700, H03F 345

Patent

active

041639502

ABSTRACT:
A differential amplifier includes an input stage and an output stage which are electrically isolated from each other to permit the input and output portions of the circuit to be operated at different voltage levels. A pair of optical couplers are employed to couple the differential signal from the input stage to the output stage. The output stage comprises a linear gain cell to provide an output signal proportional to the differential signal through the couplers divided by the common-mode signal through the couplers to stabilize gain and minimize D.C. offset drift caused by small changes in physical parameters or temperature.

REFERENCES:
patent: 3473036 (1969-10-01), Marcus
patent: 3689752 (1972-09-01), Gilbert
patent: 3810034 (1974-05-01), Brunsch
patent: 3955149 (1976-05-01), Trilling

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