QUADRATURE DETECTOR, QUADRATURE DEMODULATOR USING SAME, AND SAMPLING QUADRATURE DEMODULATOR

摘要

PROBLEM TO BE SOLVED: To detect quadrature phase error between an in-phase signal and a quadrature signal of a quadrature demodulator.;SOLUTION: Detection quadrature phase error is enabled by producing, with a multiplier 122, a product of the in-phase signal after removal of low frequency element with a first high-pass filter 111 and the quadrature signal after removal of low frequency element with a second high-pass filter 112 and using the signal after removal of the high frequency element of the output with a low-pass filter 131.;COPYRIGHT: (C)2006,JPO&NCIPI