Method of direct current offset cancellation

Details Method of direct current offset cancellation Method of direct current offset cancellation

1998-10-27

2000-12-19

Phan, Trong

Coded data generation or conversion

Converter compensation

H03M 148

Patent

active

061632856

ABSTRACT:
The present invention is directed to a system for correcting a voltage offset in a circuit by amplifying an input voltage to produce an amplified voltage; sampling an offset voltage present in the amplified voltage during a sampling mode; subtracting a value of the offset voltage from the amplified voltage during a correction mode; producing an output voltage; adding a feedback voltage to the input voltage based upon the output voltage; and maintaining the output voltage at substantially the same voltage during the sampling mode and the correction mode. This can be accomplished in an integrated circuit which includes an amplification circuit having an input and an output, wherein the input is connected to receive an input voltage and to produce an amplified voltage; a sampling circuit connected to the output of the amplification circuit, the sampling circuit being capable of sampling an offset voltage in the amplified voltage during a sampling mode and subtracting a value of the offset voltage from the amplified voltage during a correction mode, and producing an output voltage at an output; and a feedback circuit continuously connected to the output of the sampling circuit and the input of the amplification circuit for adding a feedback voltage to the input voltage based upon the output voltage; wherein the output voltage at the output of the sampling circuit is substantially the same during the sampling mode and the correction mode.

REFERENCES:
patent: 4972189 (1990-11-01), Polito et al.
patent: 5053770 (1991-10-01), Mayer et al.
patent: 5371552 (1994-12-01), Brummette et al.

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