Circuit and method for calibrating direct current offset

Details Circuit and method for calibrating direct current offset Circuit and method for calibrating direct current offset

2008-05-21

2009-12-08

Jeanglaude, Jean B (Department: 2819)

Coded data generation or conversion

Converter compensation

C341S119000, C341S143000, C341S144000

Reexamination Certificate

active

07629906

ABSTRACT:
A circuit and a method for calibrating the direct-current offset in the signal output from a signal processing unit are provided. The calibration circuit includes a 1-bit quantizer, a control logic unit and a digital-to-analog converter. The 1-bit quantizer is coupled to the output end of the signal processing unit for receiving and detecting a direct-current offset component in the output signal so as to obtain quantization information. The control logic unit is coupled to the 1-bit quantizer for sequentially setting one of a plurality of bits of a compensation value and updating the set bit according to the quantization information. The digital-to-analog converter is coupled to the control logic unit for compensating the direct-current offset component in the signal output from the signal processing unit according to the compensation value.

REFERENCES:
patent: 6100827 (2000-08-01), Boesch et al.
patent: 6313769 (2001-11-01), Mangahas et al.
patent: 6756924 (2004-06-01), Lee et al.
patent: 6968172 (2005-11-01), Saito
patent: 6985098 (2006-01-01), Lee

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