Apparatus and method for dithering a sigma-delta modulator

Details Apparatus and method for dithering a sigma-delta modulator Apparatus and method for dithering a sigma-delta modulator

2007-05-29

2008-10-28

Jeanglaude, Jean B (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Increasing converter resolution

C341S143000, C341S155000

Reexamination Certificate

active

07443324

ABSTRACT:
A signal processor includes a sigma-delta modulator. The input signal to the signal-delta modulator may contain a dc component that generates spurious tones in the modulator output. An input signal to the signal processor is multiplied by an output of a waveform generator to produce an up-converted signal prior to processing by the sigma-delta modulator. Preferably, the waveform generator produces a random signal, which may be a pseudorandom signal. However, other waveforms such as a bipolar binary waveform can also be used. The output of the waveform generator is delayed and multiplied by the output of the sigma-delta modulator to produce a down-converted signal with reduced spurious tones. The delay matches the delay of the sigma-delta modulator. The down-converted signal is filtered with a low-pass filter.

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