...：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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硬件设置的锁相环电路 PLL
采用了硬件锁相环技术，可更加有效实现同步采样，提高了采样精度。
Application of the hardware PLL technology can achieve the synchronous sampling more effectively and help improve the sampling accuracy.
利用软件实现的锁相环比硬件锁相环具有更好的灵活性和通用性，同时具有结构简单、参数设计灵活等优点。
The PLL designed by software has a higher flexibility and versatility than that by hardware, at the same time it has the advantages of simple in structure and flexible design parameters and etc.
提出了一种以复杂可编程逻辑器件（CPLD）和锁相环技术为核心的新型通用数字触发器，对其硬件电路和软件设计进行了详细分析。
To aim at the defect of the simulate trigger and the digital trigger with microcomputer, a new universal digital trigger based on CPLD and PLL is introduced.
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