Chopper stabilized delta-sigma analog-to-digital converter
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United States of America Patent
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Jul 3, 1990
Grant Date -
N/A
app pub date -
Jun 13, 1988
filing date -
Jun 13, 1988
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 two integrators (20) and (22). The first integrator (20) is a chopper stabilized integrator which is comprised of a chopper stabilized differential amplifier (32) and a capacitively switched input. The amplifier (32) is operable to receive a chopping frequency F.sub.CH that is one-half the sampling frequency F.sub.S and synchronized thereto. The amplifier (32) is operable to modulate the noise up to the chopping frequency F.sub.CH, which frequency is in the rejection portion of the filter response for the digital filter (12), thus rejecting 1/f noise.
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