QUADRATURE DEMODULATOR
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United States of America Patent
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app pub date -
Sep 13, 2013
filing date -
Mar 14, 2011
priority date (Note) -
Abandoned
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Abstract
Provided is a quadrature demodulator capable of appropriately correct an amplitude error and a quadrature error even with respect to a pulse-modulated signal. In the quadrature demodulator 100, in order to compensate an amplitude error and a quadrature error, the phase adjuster 112 is provided in the local oscillation unit 110, and the quadrature detection error detector 131 and the quadrature detection error compensator 132 are provided in the signal processing unit 130. The quadrature detection unit 120 outputs two sets of I and Q-components of an RF signal using two LO signals that have been phase-shifted by the phase adjuster 112. In the quadrature detection error detector 131, an amplitude error and a quadrature error are calculated using the two sets of I and Q-components. The quadrature detection error compensator 132 compensates a received signal using the amplitude error and the quadrature error.
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