The A/D decoding circuit received simulation signal form measurement port and converted the signals into data signals which displayed by 7-segment, then signals were sent to data latch.
译码电路接收测量端模拟信号，转化为7段显示的数字信号，发送到数据锁存器上。
2
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.