Offset voltage correction circuit

Details Offset voltage correction circuit Offset voltage correction circuit

1998-07-09

2000-04-25

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

327309, 327312, 327560, 327563, H03L 500

Patent

active

060548878

ABSTRACT:
An offset voltage correction circuit for an operational amplifier (1) includes an offset voltage varying device (16, 17, 20, 21-23) for varying an offset voltage in the operational amplifier (1) in response to an offset voltage control value. A comparing device (25) operates for comparing an output voltage from the operational amplifier (1) with a prescribed reference voltage. A control device (19, 300) operates for outputting the offset voltage control value to the offset voltage varying device, for changing the offset voltage control value, for storing, in response to a result of the comparing by the comparing device (25), a digital signal representative of the offset voltage control value at which the output voltage from the operational amplifier (1) and the prescribed reference voltage are equal, and for correcting the offset voltage in the operational amplifier (1) in response to the stored digital signal.

REFERENCES:
patent: 4581585 (1986-04-01), Bristol
patent: 5030850 (1991-07-01), Lunsford
patent: 5260614 (1993-11-01), Theus et al.
patent: 5359238 (1994-10-01), Lesko
patent: 5767545 (1998-06-01), Takahashi

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