Method for compensating gain mismatch between two DACs and...

Details Method for compensating gain mismatch between two DACs and... Method for compensating gain mismatch between two DACs and...

2006-05-30

2006-05-30

Nguyen, John B (Department: 2819)

Coded data generation or conversion

Converter calibration or testing

C341S144000, C341S155000

Reexamination Certificate

active

07053805

ABSTRACT:
The present invention discloses a method and related apparatus for compensating a gain mismatch between a first DAC and a second DAC. The second DAC is connected to a gain amplifier. The method includes the following steps. Determine a first gain value corresponding to the first DAC. Control the gain amplifier with a first control value and determine a second gain value corresponding to the second DAC and the gain amplifier. Control the gain amplifier with a second control value and determine a third gain value corresponding to the second DAC and the gain amplifier. Without utilizing a predetermined characteristic parameters, determine a calibration control value according to the first, second, third gain values, and the first and second control values. Control the gain amplifier with the calibration control value to compensate for the gain mismatch between the first DAC and the second DAC.

REFERENCES:
patent: 4736189 (1988-04-01), Katsumata et al.
patent: 5121119 (1992-06-01), Higuchi et al.
patent: 5278558 (1994-01-01), Roth
patent: 6501405 (2002-12-01), Zhang et al.
patent: 6707404 (2004-03-01), Yilmaz
patent: 2001/0028320 (2001-10-01), Prendergast et al.
patent: 2005/0219087 (2005-10-01), Chang et al

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