Multiplier is the circuit which is conformed of nonlinear elements and can make two signal multiplied so that it can implement frequency transformation.
相乘器是由非线性元件组成，可以实现两个信号的相乘，完成频率变换的电路。
The problem of synchronization of the whole system is solved through sync signal generator circuit applying phased-locked frequency multiplier;
并利用锁相环设计了同步信号发生器电路，解决了系统同步问题；
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