| 摘要 |
PROBLEM TO BE SOLVED: To obtain linearity of precise f-V property through a wide frequency area of an input FM signal. SOLUTION: This FM demodulation circuit comprises: an edge detection means which detects an edge of the input FM signal of a differential format and outputs the detected result by using the differential format; a differential amplifier 3 where only one of a positive phase input terminal and an opposite phase input terminal is connected with a positive phase output terminal or an opposite phase output terminal of the edge detection means; and a reference voltage generation circuit 4 which applies reference voltage to an input terminal which is not connected with the output terminal of the edge detection means among the positive phase input terminal and an opposite phase input terminal of the differential amplifier 3. The edge detection means comprises: a differential delay circuit 1 outputting a signal obtained by delaying the input FM signal; and a differential AND circuit 2 which inputs the input FM signal as first input and a signal outputted from the differential delay circuit as second input. COPYRIGHT: (C)2006,JPO&NCIPI
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