Apparatus and method for compensating carrier feedthrough in quadrature modulation system
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United States of America Patent
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Mar 2, 2010
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Jun 4, 2009
app pub date -
Jul 10, 2008
filing date -
Dec 4, 2007
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Abstract
The present invention relates to an apparatus and a method for compensating carrier feedthrough in a quadrature modulation system. In order to suppress the carrier feedthrough, and minimize and compensate the carrier feedthrough, differences of baseband differential input DC voltages in an in-phase as well as a quadrature-phase are simultaneously adjusted to 0 or a certain slight voltage difference by a simple analog circuit. Therefore, it is possible to suppress carrier feedthrough using a simple analog type apparatus for compensating carrier feedthrough, and simply achieve an apparatus for carrier feedthrough using a variety of quadrature modulators.
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