High speed digital delta-sigma modulator with integrated...

Details High speed digital delta-sigma modulator with integrated... High speed digital delta-sigma modulator with integrated...

2007-02-27

2007-02-27

Williams, Howard L. (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S061000

Reexamination Certificate

active

11202307

ABSTRACT:
Apparatus, and a related method, for converting digital signals directly to radio-frequency (RF) analog signals. The apparatus includes a single high-speed delta-sigma modulator and an integrated upsampler that increases the data rate of digital input samples by a selected factor, such as nine times. The delta-sigma modulator is configured to include a feedback multiplier coefficients that are selected to greatly facilitate operation of associated adders. At least one critical adder includes a carry-select adder modification that further speeds up the add operation and ensures that the apparatus operates at desirably high frequencies.

REFERENCES:
patent: 5701106 (1997-12-01), Pikkarainen et al.
patent: 6703954 (2004-03-01), Alelyunas et al.
patent: 2003/0179831 (2003-09-01), Gupta et al.
patent: 2004/0192229 (2004-09-01), Morris et al.
patent: 2004/0263365 (2004-12-01), Robinson et al.
patent: 2005/0085194 (2005-04-01), Robinson et al.
patent: 2005/0162294 (2005-07-01), Norsworthy et al.

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