摘要
采用差分输入和差分输出方案,设计了一种新型的全差分电荷泵。采用差分输出不仅能够降低电荷泄漏所带来的电压噪声,而且能够提高电荷泵的上升和下降速度,从而提高锁相环的工作速度,还能增大输出电压的范围。在差分输入端,采用正反馈电路结构,以提高开启和关断速度,并降低功耗。上拉泵电路和下拉泵电路完全对称,能够消除电流失配所带来的噪声。
A new novel fully-differential charge pump was designed in this paper, differential input and differential output was used in this circuit. The differential output circuit not only reduced the voltage noise created by leakage current, but also increased the ascending/descending speed to improve the speed of PLL further and enlarged the range of output voltage. In the differential input, positive feedback circuit was used to increase the switching speed and attain low power. The circuits of pump-up and pump-down are symmetric to overcome the disadvantage of charge/discharge current mismatches.
出处
《微电子学与计算机》
CSCD
北大核心
2006年第7期134-136,139,共4页
Microelectronics & Computer
基金
湖南省自然科学基金项目(05JJ30115)
关键词
电荷泵
大摆幅电流镜
差分输入输出
数字锁相环
Charge pump, Wide-swing current mirror, Differential input and output, DPLL
