Carrier wave reproducing circuit
专利汇可以提供Carrier wave reproducing circuit专利检索，专利查询，专利分析的服务。并且PURPOSE:To attain sure carrier wave pulling-in even at the initial state, by inserting a limiter circuit limiting an AFC circuit output signal between an output of the AFC circuit and an input of a voltage controlled oscillator. CONSTITUTION:The frequency difference between the oscillating frequency of the voltage controlled oscillator VCO8 and the carrier wave signal is detected at phase detection circuits 1, 5; a high frequency component is rejected at LPFs 2, 6, and the synchronism of the reference carrier wave is established with a base band processing circuit 3. An AFC circuit 4 detects the frequency difference component between the input carrier wave signal frequency and the oscillating frequency of the VCO8, controls the VCO8 with the DC component and applies AFC. When the linearity of the AFC circuit characteristics is extended, the oscillation frequency of the VCO8 reaches a region where no AFC voltage appears at the initial state such as power supply application and the synchronism of carrier wave is not established permanently. In connecting a limiter circuit 9 to the output of the circuit 4, however, the oscillating frequency of the VCO8 is fixed to a range where the AFC voltage appears even at the initial state.，下面是Carrier wave reproducing circuit专利的具体信息内容。
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