Circuit and method of signal detection
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United States of America Patent
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Nov 25, 2014
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app pub date -
May 18, 2012
filing date -
May 18, 2012
priority date (Note) -
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Abstract
A circuit includes an input stage, a comparison stage, and a calibration stage. The input stage is configured to receive a first input signal, to generate a first reference signal, and to generate a second reference signal. The comparison stage is configured to generate a first comparison output signal in response to the first reference signal and a third reference signal and to generate a second comparison output signal in response to the second reference signal and a fourth reference signal. The calibration stage is configured to generate a detection signal responsive to the presence of the first comparison output signal and the second comparison output signal having a signal frequency within a predetermined frequency band.
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