Patent ID: 8131243
Filing Date: 2012-03-06
Classification: G04G,G04R,H03D

Abstract:
1. A receiving circuit comprising: an antenna circuit for receiving an electromagnetic wave to obtain an electric signal; an amplifying unit for amplifying the electric signal obtained by the antenna circuit; a frequency converter/detector unit for converting a frequency of the electric signal amplified by the amplifying unit to obtain an intermediate frequency signal, and for detecting the intermediate frequency signal, thereby outputting a demodulated signal; and a filtering unit for removing an intermediate frequency component from the demodulated signal output from the frequency converter/detector unit, wherein the frequency converter/detector unit comprises: wherein the signal generating/synthesizing unit reverses the first intermediate frequency signal and second intermediate frequency signal output from the mixers and outputs the reversed first intermediate frequency signal and the reversed second intermediate frequency signal as first other intermediate frequency signals, and generates signals and outputs the generated signals as second other intermediate frequency signals, and wherein said second other intermediate frequency signals have a phase equivalent to a phase difference between the first intermediate frequency signal and the second intermediate frequency signal, a phase equivalent to a phase difference between the second intermediate frequency signal and the reversed first intermediate frequency signal, a phase equivalent to a phase difference between the reversed first intermediate frequency signal and the reversed second intermediate frequency signal, and a phase equivalent to a phase difference between the reversed second intermediate frequency signal and the first intermediate frequency signal, respectively.