Instrumentation amplifier having automatic offset adjustment

Details Instrumentation amplifier having automatic offset adjustment Instrumentation amplifier having automatic offset adjustment

1981-12-15

1984-12-25

Mullins, James B.

Amplifiers

With periodic switching input-output

330110, 330259, H03F 126

Patent

active

044906820

ABSTRACT:
An instrumentation amplifier having automatic offset error adjustment to null unwanted DC output signals. The DC gain of the instrumentation amplifier is first increased by reducing the internal negative feedback which increases the amplitude of unwanted DC signals; thereafter, an offset correction signal is provided to reduce the unwanted DC signals. The normal operating DC gain is restored and the unwanted DC output signal is further reduced.

REFERENCES:
patent: 3448393 (1969-06-01), Rice, Jr.
patent: 3995227 (1976-11-01), Lefevre
patent: 4229703 (1980-10-01), Bustin
patent: 4356450 (1982-10-01), Masuda

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