Amplifier circuit with open-loop gain that can be varied with re

Details Amplifier circuit with open-loop gain that can be varied with re Amplifier circuit with open-loop gain that can be varied with re

1991-03-06

1992-05-05

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330278, H03G 310

Patent

active

051111594

ABSTRACT:
An operational amplifier circuit has an inverting and a noninverting input terminal and an output terminal and a current source circuit. A signal output from the output terminal is fed back to the inverting input terminal via a resistor for setting a closed-loop gain of the amplifier. To a part of a current path of the current source circuit is connected a resistor for changing the current of the current circuit to set an arbitrary open-loop gain of the amplifier.

REFERENCES:
patent: 3851270 (1974-11-01), Vosteen
patent: 4847567 (1989-07-01), Fenk
patent: 5001439 (1991-03-01), Lopata et al.

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