一、概述锁相环路可以实现两个信号相位同步。在理想的情况下,可以使两个信号在频率上相等,同时在相位上保持恒定关系。锁相技术在数字磁记录系统中亦逐渐得到应用。在磁记录系统中,为了分离数据和同步,可采用外同步或自同步的方式。在自同步方式中,用锁相环路提取同步信息的做法较为普遍。图1是锁相同步电路的框图,主要由整形电路、 First, an overview of the phase-locked loop can achieve two signal phase synchronization. In the ideal case, the two signals can be made equal in frequency while maintaining a constant relationship in phase. Phase-locked technology in the digital magnetic recording system has gradually been applied. In the magnetic recording system, in order to separate data and synchronization, external synchronization or self-synchronization can be adopted. In the self-synchronization method, the phase-locked loop to extract synchronization information is more common. Figure 1 is a block diagram of the phase-locked synchronous circuit, mainly by the plastic circuit,