Long-term integrator
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United States of America Patent
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-
Dec 21, 1993
Grant Date -
N/A
app pub date -
Jun 8, 1992
filing date -
Jun 17, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A long-term integrator, e.g. for integrating the voltage signal from a coil measuring magnetic induction, can include a push-pull modulator followed by an analog-digital converter, a digital signal processor and a digital analog converter in cascade. Offset voltage in the analog-digital converter or an amplifier upstream thereof is nullified in the digital signal processor by modulating it as the measured signal is demodulated, thereby balancing out alternate polarity portions of the offset voltage.
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