Harmonic cancellation for frequency conversion harmonic cancellation
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United States of America Patent
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Mar 4, 2014
Grant Date -
Jun 20, 2013
app pub date -
Dec 16, 2011
filing date -
Dec 16, 2011
priority date (Note) -
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Abstract
A radio frequency (RF) receiver, such as a television tuner, includes a harmonic cancellation circuit. The harmonic cancellation circuit includes a primary signal path to generate a first intermediate frequency (IF) signal by mixing an RF signal with a reference signal and a harmonic feedforward signal path to generate a second IF signal representing signal content of the RF signal near an nth-order harmonic of a frequency fLO of the first reference signal, n comprising a positive integer. The harmonic cancellation circuit further includes a summation stage to generate a third IF signal based on a difference between the first IF signal and the second IF signal.
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