锁相环技术在三十年代已经研制成功。当时因其电路较为复杂,限于在自动控制设备等工业方面使用。随着大规模集成电路技术的发展,锁相环技术已大量地应用到民用设备上。锁相环基本工作原理1.基本方框图图1是锁相环的基本方框图。锁相环主要 PLL technology has been successfully developed in the thirties. At that time because of its circuit is more complicated, limited to automatic control equipment and other industrial use. With the development of large-scale integrated circuit technology, phase-locked loop technology has been widely applied to civilian equipment. PLL basic working principle 1 basic block diagram Figure 1 is the basic block diagram of the phase-locked loop. The main phase-locked loop