Digital to analog converter

Details Digital to analog converter Digital to analog converter

2006-05-02

2006-05-02

Nguyen, John B (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

C341S145000

Reexamination Certificate

active

07038608

ABSTRACT:
A digital to analog converter includes a digital processor having an input port adapted to receive an input signal and an output port coupled to an input port of an analog filter wherein the digital processor includes a digital feedback loop which compares a reference digital voltage with a digital voltage provided by a digital model of the analog filter. Using a completely digital feedback loop which compares an input digital voltage with the digital voltage from the digital model of the analog filter results in a single bit digital to analog converter having improved accuracy for a given clock rate and filter. The next digital state of the converter (i.e. ‘0’ or ‘1’) is selected based upon a comparison of the input (or reference) voltage with the digital voltage provided by the digital feedback loop. The digital converter output is then fed to the analog filter. If the analog filter matches the digital model, then the analog voltage will match the digital voltage, and therefore the reference voltage.

REFERENCES:
patent: 5727023 (1998-03-01), Dent
patent: 6864699 (2005-03-01), Sakayori et al.
patent: 2004/0208249 (2004-10-01), Risbo et al.

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