Delay compensation for sigma delta modulator
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United States of America Patent
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Jan 28, 2014
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N/A
app pub date -
Aug 29, 2012
filing date -
Aug 29, 2012
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Abstract
A continuous time delta-sigma modulator is provided that includes an integrator stage including a plurality of integrators; a quantizer to receive an input signal from the integrator stage and output a quantizer signal; a global feedback path providing feedback from the quantizer to the integrator stage; a local feedback path connecting the quantizer and a preceding integrator of the integrator stage configured to compensate for delay attributed to the global feedback path; and a delay compensation circuit. The delay compensation circuit is configured to calculate a delay value based on sources of additional delay within a local feedback loop, and to supply the additional delay value to the quantizer to compensate for delay within the local feedback loop.
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