Operational amplifier having enhanced gain through current feedb

Details Operational amplifier having enhanced gain through current feedb Operational amplifier having enhanced gain through current feedb

1983-05-13

1985-01-08

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330257, 330288, H03F 345

Patent

active

044929293

ABSTRACT:
An integrated operational amplifier circuit includes an input stage comprising first and second junction field effect transistors coupled to a current mirror circuit and an output stage including first and second NPN transistor means for respectively supplying current to and receiving current from a load. In order to compensate for voltage translated back to the output of the input stage, a portion of the current received by the second transistor means is fed back to a metallic power supply conductor. The input field effect transistors are also coupled to a current mirror means including degeneration resistors which are likewise coupled to the power supply conductor means. In this manner, a small portion of the current fed back to the power supply conductor means creates a voltage differential between the first and second degeneration resistors thus compensating for the voltage fed back to the output of the input stage.

REFERENCES:
patent: 4336503 (1982-06-01), Whatley

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