Single-ended chopper stabilized operational amplifier

Details Single-ended chopper stabilized operational amplifier Single-ended chopper stabilized operational amplifier

1989-07-28

1990-08-07

Mottola, Steven

Amplifiers

With periodic switching input-output

330253, 330277, H03F 102, H03F 316

Patent

active

049471350

ABSTRACT:
A single-ended operational amplifier uses a plurality of chopper circuits to alternately transpose matched transistor pairs for cancelling offset errors due to transistor mismatches from statistical process variations. The differential input signals are transposed while simultaneously transposing the currents in a current mirror and in the load devices. The matched devices comprising an output stage remain un-transposed since their contribution to offset error is minimal but their contribution to noise error would be substantial due to the potentially larger voltage differentials existing between them.

REFERENCES:
patent: 4423385 (1983-12-01), Evans
patent: 4829263 (1989-05-01), Gulczynski

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