Operational amplifier or comparator circuit with minimized offse

Details Operational amplifier or comparator circuit with minimized offse Operational amplifier or comparator circuit with minimized offse

1986-12-24

1988-06-07

Wan, Gene

Amplifiers

With periodic switching input-output

330149, H03F 102

Patent

active

047499532

ABSTRACT:
The invention relates to an operational amplifier (OA) or comparator circuit with minimized offset voltage and drift, particularly for analog and/or digital systems requiring high speed and high accuracy signal processing, such as integrators, analog-to-digital converters, etc. The provided OA and comparators circuits retain a high speed and have a drastically increased accuracy. No correcting amplifier is necessary. The gain set by external components is insignificant. Widely available high speed switching components can be used. The tolerance of the passive components used is not critical. The values of the capacitors are determined by the switching frequency and amount of the input bias current of the employed OA. A FET OA can be used as its very large offset voltage and drift can be easily compensated.

REFERENCES:
patent: 4439693 (1984-03-01), Lucas et al.

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