单片机设计了一种单片锁相倍频电

路，利用片内定时器和数字算法实现了对输入信号的同步

锁相和倍频，并输出倍频信号-: A single- chip digital phase- locking frequency- multi-

plier circuit is designed based on the AT89c2051.The circuit

can track the input signal in- phase and output the frequency-

multiplier signal. It is verified by the experiment results that the

design is correct