Through redesigning the structure of the original PFD circuit and based on the traditional D trigger PFD, two new PFDs, transmission gate D trigger PFD and flip-latch based PFD were proposed.
通过对原有PFD电路结构进行重新设计，在传统D触发器PFD的基础上提出了两种新型PFD：传输门D触发器型PFD和基于锁存器的PFD。
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