在数据采集系统中，锁相环是一种非常有用的同步技术，因为通过锁相环，可以使得不同的数据采集板卡共享同一个采样时钟。-In the data acquisition system, the phase-locked loop is a very useful synchronization technology, because the adoption of phase-locked loop, you can make the different data acquisition boards share the same sampling clock.