D/A converter circuit and digital input class-D amplifier

Details D/A converter circuit and digital input class-D amplifier D/A converter circuit and digital input class-D amplifier

2011-04-05

2011-04-05

Nguyen, Khai M (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Increasing converter resolution

C341S143000, C341S144000, C330S20700P, C330S251000

Reexamination Certificate

active

07920082

ABSTRACT:
The present invention provides a D/A converter circuit which enables D/A conversion with a high precision and can prevent occurrence of a limit cycle component in the case where an input signal is low, and can also prevent the effect of dither signal from occurring in an analog signal which is a D/A conversion result.A dither signal generation section505outputs a dither signal (DITHER) which is an alternating current signal and a reversal dither signal (DITHER_N) inverted from the dither signal. A DEM decoder502processes an input digital signal including a component of the dither signal (DITHER), and outputs a plurality of lines of time-series digital signals having a density of “1” or “0” conforming to the input digital signal to be processed. An analog addition section503converts a plurality of lines of time-series digital signals and the reversal dither signal (DITHER_N) into an analog signal respectively and adds them, and outputs an analog signal which is a D/A conversion result.

REFERENCES:
patent: 4644324 (1987-02-01), Araki et al.
patent: 5012242 (1991-04-01), Yoshio et al.
patent: 5073778 (1991-12-01), Ueki et al.
patent: 5818372 (1998-10-01), Noro
patent: 7471223 (2008-12-01), Lee

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