一种用于锁相环的正反馈互补型电荷泵电路

Design of charge-pump circuit with positive feedback complementary CMOS for PLL

给出了一种新型的互补型电荷泵电路.采用正反馈技术,电路由CSMC1.2μmCMOS工艺实现,可工作在2V的低电压下.Spectre仿真结果显示,电荷泵的工作频率为100MHz时,功耗为0.08mW,输出信号的电压范围宽(0～2V),电路速度快,波形平滑,抖动小,在不增加电路功耗的前提下消除了传统电荷泵电路的电压跳变现象.该电荷泵电路可以很好地应用于低电源电压、高频锁相环电路.

A novel complementary CMOS charge pump circuit was presented. Its switching speed was increased by using positive feedback. It was designed by using CSMC 1.2μm CMOS technology and simulated by Spectre. The power consumption of the proposed charge pump circuit was 0.08?mW at a supply voltage of 2?V and frequency 100?MHz. Seen from the spectre simulation results, this charge pump circuit has rapid switching speed and low power consumption. The range output voltage is about 0～2?V. Besides the jitter of the conditional charge pump circuit was eliminated without increasing the power consumption. The circuit can be used in either single-ended or fully differential phase-locked loop structures.