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专利名称：Frequency conversion circuit, demodulation
circuit, and television receiving device
发明人：Yoshikatsu Matsugaki,Akinobu Morota申请号：US10105541申请日：20020325
公开号：US20020191117A1公开日：20021219
专利附图：
摘要：A demodulation circuit that does not produce Nyquist buzzing. After IF signalsoutput by bandpass filter () are multiplied by first and second multipliers () and () with acarrier wave reproduced by carrier wave reproduction part () and a carrier wave whose
phase is shifted &pgr;/2, respectively, they are squared by first and second square-lawcircuits () and () and added together by addition adder (). The error produced by theNyquist slope is removed from the output of adder ().
申请人：MATSUGAKI YOSHIKATSU,MOROTA AKINOBU
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