Before the design of digital circuit, measurement method of phase difference is discussed. Two-way zero passage phase detector is chosen as solution finally.
在正式进入数字电路设计之前，先讨论了相位差测量方法，并选定双向过零鉴相作为实现方案。
2
Then the demodulated signal and the signal of the reference piezoelectric hydrophone were input into a high-resolution digital phase detector to get the phase difference.