一种新型不同频直接鉴相的锁相环

Novel phase-locked loop with direct phase detection for two frequency different signals

对于输入和输出信号频率接近或者近似成整数倍关系类型的频率变换,利用目前的锁相技术很难解决.基于异频信号间的相位差变换规律,采用相位重合点检测电路、等效鉴相电路、可调偏置型环路滤波器等设计了一种新型的锁相环.实验结果表明,上述锁相环具有低噪声、高稳定度、输出频率便于调整等特点.

It is difficult to do a frequency conversion using the current phase-locked technology when the input and output frequencies are approximatly equal or have an approximate integer multiple relationship. Based on the change law of the phase difference between the two different frequency signals, by using the phase coincidence detection circuits, the equivalent phase demodulation circuits and a filter with an adjustable bias, a new type of PLL is realized. Experimental studies are done with the results showing that the phase-locked loop has characteristics such as low noise, high stability, the easy-to-adjust output frequency.