Delta-sigma analog-to-digital converter with chopper stabilization at the sampling frequency
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United States of America Patent
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Aug 13, 1991
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N/A
app pub date -
Oct 27, 1989
filing date -
Oct 27, 1989
priority date (Note) -
Expired
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Abstract
A chopper stabilized analog-to-digital converter includes an analog modulator (10) and a digital filter (12). The analog modulator (10) is comprised of four integrators, a first integrator (20) which is continuous time and the remaining stages of integration (22) which are either continuous or discrete. The first integrator (20) is a chopper stabilized integrator which is comprised of a chopper stabilized differential amplifier (32) which has a single ended output and operates in a continuous time mode. The modulator has a zero that is located at the harmonics of the sampling frequency of the modulator and the chopping clock for the chopper stabilized operation operates at the sampling frequency.
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