Product detector and method therefor
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United States of America Patent
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May 8, 2001
Grant Date -
N/A
app pub date -
Oct 15, 1998
filing date -
Oct 15, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A product detector for converting a signal to baseband includes a commutating switch which serves to sample an RF waveform four times per period at the RF frequency. The samples are integrated over time to produce an average voltage at 0 degrees, 90 degrees, 180 degrees and 270 degrees. The average voltage at 0 degrees is the baseband in-phase signal, and the average voltage at 90 degrees is the baseband quadrature signal. Alternatively, to increase gain, the 0 degree average can be differentially summed with the 180 degree average to form the baseband in-phase signal, and the 90 degree average can be differentially summed with the 270 degree average to produce the baseband quadrature signal.
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