Combining fully-differential and single-ended signal processing in a delta-sigma modulator
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United States of America Patent
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Nov 26, 1991
Grant Date -
N/A
app pub date -
Oct 27, 1989
filing date -
Oct 27, 1989
priority date (Note) -
Expired
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Abstract
An oversampling analog-to-digital modulator includes an analog loop filter which has a first integrator stage which is a single-ended integrator. The second, third, and fourth integrator stages are fully-differential integrators. The first integrator provides the required thermal noise characteristics of the loop filter with only one feedback capacitor which is external to the integrated circuit chip, while the fully-differential integrator stages provide improved suppression of charge injection transients.
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