D/A converter and output amplifying circuit

Details D/A converter and output amplifying circuit D/A converter and output amplifying circuit

2007-05-22

2007-05-22

Nguyen, Khai M. (Department: 2819)

Coded data generation or conversion

Converter calibration or testing

C341S118000, C341S143000, C341S144000, C341S152000, C330S010000, C330S20700P, C330S251000

Reexamination Certificate

active

10250325

ABSTRACT:
A D/A converter in which distortion caused by PWM is favorably removed even if a sampling frequency is low relative to a signal frequency is provided. The D/A converter includes a pulse-width-modulated-signal outputting circuit for outputting a pulse-width-modulated signal having a pulse width in accordance with a digital value of an input digital signal. A distortion-correcting-component generating circuit (3) for generating from the input digital signal at least a correcting component corresponding to a distortion component generated in the pulse-width-modulated-signal outputting circuit; a subtractor circuit (2) disposed at an upstream of the pulse-width-modulated-signal outputting circuit, for subtracting the correcting component generated by the distortion-correcting-component generating circuit from the input digital signal; and a phase correcting circuit (10) for correcting phase characteristics of the input digital signal so that the distortion component and the correcting component have a phase difference such that these components have opposite phases in the pulse-width-modulated-signal outputting circuit; are provided.

REFERENCES:
patent: 5548286 (1996-08-01), Craven
patent: 6147634 (2000-11-01), Rangan et al.
patent: 6198416 (2001-03-01), Velazquez
patent: 6292122 (2001-09-01), Younis et al.
patent: 6373334 (2002-04-01), Melanson
patent: 6765436 (2004-07-01), Melanson et al.
patent: 02-200012 (1990-08-01), None
patent: 02200012 (1990-08-01), None
patent: 03-060222 (1991-03-01), None
patent: 07-022861 (1995-01-01), None
Supplementary European Search Report EP02802369, Mar. 01, 2005.

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