用传输门VCO和动态PFD设计低功耗CMOS琐相环

锁相环（PLL）是VLSI系统的重要单元电路之一，为了实现高速低功耗的CMOS锁相环，用传输门VCO和动态反相器PFD电路设计CMOS锁相环。传输门结构VCO具有高速、低电压和低功耗的特性，而动态反相器PFD具有功耗低和面积小的特点。SPICE模拟表明，当电源电压为2．5V时，基于0．6μmCMOS工艺设计的CMOS锁相环电路，工作频率高达1000MHz，而功耗低于50mW。

A CMOS Low Power PLL Designed in Transistor Level with Transmission Gate VCO and Dynamic PFD

To realize the high speed and low power CMOS PLL(Phase Locked Loop), the new circuits of VCO and PFD is designed in transistor level. In the VCO, the high speed and low power is realized using transmission-gate(TG) with an adaptive delay cell and low supply sensitivity. This delay cell has a built-in compensation circuit that senses and corrects the delay variation caused by supply fluctuation. And in the PFD, low power and small chip area is realized with the dynamic inverter. A fully CMOS PLL using these components has been designed based 0.6 μm CMOS technology and its SPICE model. SPICE simulation results show that at 2.5V supply voltage, the designed PLL can operate over 1000 MHz and dissipate power less than 50mW.