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Fm demodulation circuit

阅读:171发布:2022-09-21

专利汇可以提供Fm demodulation circuit专利检索,专利查询,专利分析的服务。并且PURPOSE:To reduce high modulation distortion at a weak input, by eliminating the effect on a PLL lock range at a weak input of an intermediate frequency band filter, through the following of a tuning band center frequency of an intermediate frequency transformer to a PLL synchronizingly. CONSTITUTION:An output of a loop filter 6 of a PLL demodulation circuit 8 is taken as a control voltage of a variable capacitor 9 of an LC resonance circuit of a voltage controlled oscillator 7, the oscillating frequency is changed and taken as a control voltage of a variable capacitor 14 of an intermediate frequency tuning circuit 2, allowing to change the center frequency of the tuning band. As a result, the effect of the band characteristics of the intermediate frequency stage is elminated, the state of signal input level and noise to a phase comparator 5 is made constant, the narrow lock range at weak input can be prevented and a high modulation distortion at weak input can be decreased.,下面是Fm demodulation circuit专利的具体信息内容。

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