D/A converting device with offset compensation function and...

Details D/A converting device with offset compensation function and... D/A converting device with offset compensation function and...

2005-05-03

2005-05-03

Williams, Howard L. (Department: 2819)

Coded data generation or conversion

Converter compensation

C341S120000

Reexamination Certificate

active

06888481

ABSTRACT:
An input changing switch is provided at a preceding stage of a comparator that measures a DC offset of a D/A converter, and also a selective polarity inverting circuit is provided at a subsequent stage. A first compensation value is generated by a compensation value generating means and then stored in a register. Then, a second compensation value is generated by switching the input changing switch and the polarity inverting circuit and then stored in a register. Then, a third compensation value is calculated by averaging the first compensation value and the second compensation value by a compensation value calculating circuit. Then, the DC offset of the D/A converter is compensated by using this compensation value. Therefore, it enables to implement a precise DC offset compensation of the D/A converter by canceling the DC offset contained in the comparator itself employed in the DC offset compensation of the D/A converter.

REFERENCES:
patent: 5894280 (1999-04-01), Ginetti et al.
patent: 6100827 (2000-08-01), Boesch et al.
patent: 6313769 (2001-11-01), Mangahas et al.
patent: 20030006920 (2003-01-01), Mori
patent: 0 655 841 (1995-05-01), None
patent: 7-202693 (1995-08-01), None
patent: 2003008407 (2003-01-01), None
Millman, J., Microelectronics Digital and Analog Circuits and Systems, 1979, McGraw-Hill Inc., pp. 611-612.

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