SYNCHRONOUS DETECTION CIRCUIT,申请号JP20050197960-传众专利搜索

SYNCHRONOUS DETECTION CIRCUIT

申请公布号：JP2007019756(A)

申请号：JP20050197960

申请日期：2005.07.06

申请公布日期：2007.01.25

申请人：

ASAHI KASEI MICROSYSTEMS KK

发明人：SAWADA KAZUNARI

分类号：H03D1/22

主分类号：H03D1/22

摘要：PROBLEM TO BE SOLVED: To provide a synchronous detection circuit or the like in which a circuit scale is small, there is no characteristic fluctuation, in-phase components are not detected from input signals and group delay is fixed. SOLUTION: A sample-and-hold circuit 14 samples and holds the input signals IN at the rise of a clock CLK from a waveform shaping circuit 11. That is, the sample-and-hold circuit 14 samples and holds the input signals IN when the rise of carriers S1 crosses zero. A sample-and-hold circuit 15 samples and holds inversion signals S3 from an inversion circuit 13 at the fall of the clock CLK. That is, the sample-and-hold circuit 15 samples and holds the inversion signals S3 when the fall of the carriers S1 crosses zero. An addition circuit 16 adds the output S5 of the sample-and-hold circuit 14 and the output S6 of the sample-and-hold circuit 15 and outputs the added result as detection signals OUT. COPYRIGHT: (C)2007,JPO&INPIT