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 extend a pull-in range, to prevent a pseudo locking state and to perform normal phase pull-in in high speed, by applying an isolated pulse of an output of differentiation circuit as a control signal to a voltage controlled oscillator so as to change an oscillation frequency into an input signal frequency. CONSTITUTION:An input signal is divided into two at a hybrid circuit 21, the result is applied to phase detectors 22, 23 and the output is processed at a base band processing circuit 24. In this case, a reproduced carrier wave from a VCO34 is applied to the detector 22 directly and to the detector 23 with phase shifting at a 90 deg. phase shifter 35 to perform the phase detection of 4-phase PSK modulation wave. The output of the circuit 24 is differentiated at differentiation circuits 25 and 26, the differentiation output and the output of the circuit 24 are mixed at mixers 27 and 28, and the output difference of the mixers 27 and 28 is outputted from a difference circuit 29. An output voltage of an LPF30 is changed through the difference and applied to a discrimination circuit 36, the output of the circuit 36 is differentiated at a differentiation circuit 31, a VCO34 is controlled with an isolated pulse of the circuit 31 to change the oscillation frequency to the input frequency, allowing to extend the pull-in range.，下面是Carrier wave reproducing circuit专利的具体信息内容。
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