Noise-shaping of additive dither in analog-to-digital converters

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United States of America

PATENT NO 12224761
APP PUB NO 20230344436A1
SERIAL NO

17729374

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Abstract

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An analog-to-digital converter circuit module utilizing dither to reduce multiplicative noise. A dither generation circuit generates a noise-shaped analog dither signal having lower amplitudes at frequencies below a cutoff frequency than at frequencies above the cutoff frequency. The noise-shaped analog dither signal is added to the input analog signal to be converted and the summed signal applied to an analog-to-digital converter The dither generation circuit may be implemented as an analog dither generator followed by an analog high-pass filter. The dither generation circuit may alternatively be implemented digitally, for example with a digital noise-shaping filter applying a high-pass digital filter to a pseudo-random binary sequence. The digital dither generation circuit may alternatively be implemented by one or more 1-bit sigma-delta modulators, each generating a bit of a digital dither sequence that is converted to analog.

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  • TEXAS INSTRUMENTS INCORPORATED

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Gopinath, Nithin Bangalore, IN 12 18
Moondra, Harshit Mumbai, IN 5 2
Pentakota, Visvesvaraya A Bangalore, IN 34 245
Shrivastava, Neeraj Bangalore, IN 28 77

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