Self-zeroing amplifier

Details Self-zeroing amplifier Self-zeroing amplifier

1989-06-19

1991-10-29

Mullins, James B.

Amplifiers

With periodic switching input-output

330259, H03F 345, H03F 102

Patent

active

050619004

ABSTRACT:
A precision amplifier that, in response to digital inputs, zeros its offset voltage. The precision amplifier comprises a traditional amplifier; a current source controlled by a counter; a comparator; test switches; and control logic. A digital input, such as might be generated from a microprocessor, initiates the offset adjustment. The test switches disconnect the amplifier inputs from external package connections and connect the inputs together. The counter begins to count, changing the current produced by the current source at each count. The current from the current source is applied to the offset adjust circuit of the amplifier which changes the offset voltage as the current changes. The counter counts until the comparator indicates the offset voltage has been zeroed. Alternative embodiments allow the precision amplifier to adjust for offset introduced by circuitry connected to the input and the output of the precision amplifier.

REFERENCES:
patent: 4356450 (1982-10-01), Masuda
patent: 4395681 (1983-07-01), Hornung et al.

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