Offset reducing circuit for differential amplifier

Details Offset reducing circuit for differential amplifier Offset reducing circuit for differential amplifier

1992-08-26

1994-11-15

Nelli, Raymond A.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

H03F 345

Patent

active

053651910

ABSTRACT:
A differential amplifier includes a differential couple in which emitters of a pair of transistors are connected by a resistor. A voltage difference between bases or emitters of the transistors is detected, and a current responding to the voltage difference is fed back to the differential couple from a current canceling circuit to cancel a current which causes the voltage difference. As a result, an offset generated between inputs of a differential amplifier due to differences between constant currents is reduced.

REFERENCES:
patent: 4390848 (1983-06-01), Blauschild
patent: 4430622 (1984-02-01), Simoes
patent: 4543538 (1985-09-01), Fay
patent: 4760286 (1988-07-01), Pigott
patent: 4808942 (1989-02-01), Milkovic
patent: 4881044 (1989-11-01), Kinoshita et al.
patent: 5047727 (1991-09-01), Theus
patent: 5124663 (1992-06-01), McEntrfer et al.
patent: 5164176 (1992-09-01), Evans
patent: 5220288 (1993-06-01), Brooks

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