Reducing the distortion of applied modulation
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United States of America Patent
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Sep 18, 2012
Grant Date -
Dec 30, 2010
app pub date -
Feb 26, 2009
filing date -
Feb 27, 2008
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Abstract
Signal modulation apparatus for applying a modulation signal to a carrier signal, the apparatus comprising: an amplitude modulator for modulating the amplitude of the carrier signal in accordance with a control signal; first mixing means for mixing together fractions of the carrier signal before and after action of the amplitude modulator to produce a first detection signal indicative of the amplitude modulation applied by the amplitude modulator; and detection means for comparing the control signal with a first detection signal to evaluate distortion in the first detection signal as compared with the control signal.
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