| 摘要 |
PURPOSE: To provide a QAM signal clock recovery circuit with ease of circuit integration in which stable clock recovery operation is attained at all times. CONSTITUTION: A QAM signal is sampled by a sampling circuit 11 and the result is given to an absolute value circuit 12. Its output is given to a demultiplexer circuit 13 and then code addition circuits 14, 15, an adder circuit 16 sums the signals and its output is fed to a VCO circuit 18 as a control signal. The output of the VCO circuit 18 is used for a sampling signal of the sampling circuit 11 and used for a clock of the QAM signal. |
