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设计了一种可快速锁定的宽频带CMOS电荷泵锁相环电路.通过增加一个自适应带宽控制模块,当锁相环处于捕捉状态时,增加环路带宽实现快速锁定;锁相环接近锁定状态时,减小带宽,保证环路的稳定性和减小杂散.同时还设计了能工作在宽频率范围的压控振荡器.该锁相环基于0.25μm CMOS工艺,供电电压为2.5V时,工作范围在960～2 560MHz,功耗为8.9～23.2mW,锁定时间小于12μs.
A wide band CMOS charge pump phase locked loop (PLL) circuit is designed for fast locking. By adding an adaptive bandwidth control module, the loop bandwidth is increased for fast locking when the phase locked loop is in the capture state. The phase locked loop is close to the locked state , Reduce the bandwidth, ensure the stability of the loop and reduce the spurious.At the same time, the voltage-controlled oscillator that can work in a wide frequency range is also designed.The phase-locked loop is based on the 0.25μm CMOS process, when the supply voltage is 2.5V , The working range of 960 ~ 2 560MHz, power consumption of 8.9 ~ 23.2mW, lock time is less than 12μs.