Combining continuous time and discrete time signal processing in a delta-sigma modulator
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United States of America Patent
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Jan 7, 1992
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N/A
app pub date -
Oct 27, 1989
filing date -
Oct 27, 1989
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Expired
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Abstract
An oversampling analog-to-digital modulator includes an analog loop filter which has a first integrator stage which operates as a continuous time integrator. the second, third, and fourth integrator stages are discrete time or sampling integrators. The continuous time first integrator provides the required thermal noise characteristics of the loop filter while the discrete time integrator stages provide loop stability and transfer characteristics which are advantageous to the overall operation of the analog-to-digital modulator.
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