Apparatus and method for demodulation
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United States of America Patent
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Dec 4, 2012
Grant Date -
Aug 9, 2012
app pub date -
Feb 9, 2011
filing date -
Feb 9, 2011
priority date (Note) -
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Abstract
Apparatus and methods for demodulation are provided. In one embodiment, a method includes receiving an input signal having a frequency that varies in relation to a state of the signal, calculating a sine and cosine of a phase control signal, generating a first signal proportional to the sine of a product of a first quantity and the frequency of the input signal, generating a second signal proportional to the cosine of a product of the first quantity and the frequency of the input signal, and summing a product of the first signal and the cosine of the phase control signal with a product of the second signal and the sine of the phase control signal to generate a demodulator output for resolving the state of the input signal. In certain implementations, the phase control signal is controlled so as to reduce a frequency error of the input signal.
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