Transmitter including polar modulation circuit
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United States of America Patent
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Jul 2, 2013
Grant Date -
May 3, 2012
app pub date -
Apr 9, 2010
filing date -
Jul 2, 2009
priority date (Note) -
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Abstract
Provided is a transmitter including a polar modulation circuit which adjusts a timing lag between an amplitude component and a phase component more accurately than a conventional art. The polar modulation circuit includes: a first calculator for performing an exclusive OR logical operation between the amplitude component before and after being inputted to the first processing section; a second calculator for performing an exclusive OR logical operation between the phase component before and after being inputted to the second processing section; and a delay fluctuation detection/compensation section for obtaining a delay time of the amplitude component based on an amount of output accumulation of the first calculator; obtaining a delay time of the phase component based on an amount of output accumulation of the second calculator; detecting an amount of delay fluctuation by using the delay times; and adjusting timings of the amplitude component and the phase component.
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