Digital envelope detector
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Oct 19, 2004
Grant Date -
May 1, 2003
app pub date -
Sep 26, 2002
filing date -
Jun 28, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A digital envelope detector (consisting of both hardware and software) that provides accurate measurements of changes of peak values of an AC signal (these peak values constitute the envelope of a signal). Such accurate envelope measurements are required to optimize the accuracy and selectivity of chemical sensors. A signal of interest is compared to each of a set of accurately calibrated reference voltages provided by a digital to analog converter. A digital logic circuit and software respond each time the signal fails to exceed the current reference voltage. In that event, relevant data (time or cycle count) are digitally recorded and a new reference voltage is installed. The process is repeated until the desired range of change of signal is measured.
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