Self-calibrating continuous-time delta-sigma modulator
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United States of America Patent
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Jan 29, 2008
Grant Date -
Mar 29, 2007
app pub date -
Jan 27, 2006
filing date -
Sep 23, 2005
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Abstract
A self-calibrating continuous-time delta-sigma modulator determines whether time constants of its internal integrators are too large or too small by injecting a calibrating sequence into the modulator and examining a correlation between the calibrating sequence and a modulator output sequence. Then the time constants of the internal integrators are adjusted accordingly. In one embodiment, the correlation is exploited based on matching a noise transfer function of the modulator using an adaptive filter based on a least mean square (LMS) algorithm.
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