Offset cancellation for differential amplifiers

Details Offset cancellation for differential amplifiers Offset cancellation for differential amplifiers

1995-09-29

1997-05-20

Mottola, Steven

Amplifiers

With periodic switching input-output

330258, H03F 345

Patent

active

056316038

ABSTRACT:
A differential amplifier with improved offset cancellation is disclosed. The differential amplifier has a floating current source coupled to the drain terminals of the differential pair for providing complementary currents to cancel the offset voltage. In this way, the tail current in the differential pair is not affected by the offset cancellation and remains constant, while the common-mode offset is not worsened by the injected current.

REFERENCES:
patent: 4806875 (1989-02-01), Schaffer
patent: 5124663 (1992-06-01), McEntarfer et al.

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