Sigma-delta modulator with trimmed reference voltage for quantizer
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United States of America Patent
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Jul 29, 2014
Grant Date -
Jul 24, 2014
app pub date -
Jan 24, 2013
filing date -
Jan 24, 2013
priority date (Note) -
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Abstract
A sigma delta modulator includes a first circuit that receives an analog signal and provides an intermediate signal and a first quantizer signal and further includes a first quantizer that receives the first quantizer signal and provides a first quantizer output. Also included are a second input circuit that receives the intermediate signal and provides a second quantizer signal and a second quantizer that receives the second quantizer signal and provides a second quantizer output. The first quantizer includes a programmable circuit having a first reference and a negative of the first reference, a first comparator having a first input coupled to the first quantizer signal, a second input coupled to the first reference and a second comparator having a second input coupled to the first quantizer signal a second input coupled to the negative. The first and second comparators have outputs that form the output of the first quantizer.
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