一种全差分电荷泵设计

Design of a Fully-differential Charge Pump

本文设计一种新型的全差分电荷泵,采用差分输入和差分输出。采用差分输出不但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。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,并采用正反馈电路结构,以提高开启和关断速度,并降低功耗。电路在0.18μm工艺,BSIM 3V 3模型下,采用Cadence中的Spectre仿真工具进行仿真,当电源电压VDD=1.8V,f=100MH z时,电路输出的电压范围是0V^1.8V,功耗为0.01mW。

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 and the range of output voltage. The circuits of pump-up and pump-down are symmetric to overcome the disadvantage of charge/discharge current mismatches. Positive feedback circuit was used to increase the switching speed and attain low power. The circuit was simulated by the Spectre in Cadence with 0. 18μm process, BSIM3V3 model parameters. When VDD =1.8V, f =100MHz,the range of output voltage is 0V-1. 8V,and power is 0.01mW.