...：超声波；谐振频率；硬件锁相环；PS-PWM [gap=998]Keywords：ultrasonic；resonance frequency；hardware phase locked loop；PS-PW M ...
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Through debugging the hardware circuit of the Phase Locked Loop and writing the Single-Chip Processor program, a good performance frequency source is realized.
通过对锁相环硬件电路的调试和编写相关单片机控制程序，实现了一个性能较好的频率源。
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