一种改进型高性能电流舵电荷泵电路设计

Design of a Modified High Performance Current Steer Charge Pump Circuit

提出一种改进型高性能单端电荷泵电路 ,该电路基于电流舵结构 ,使用运放将偏置电路与充放电电路分开。该电路具有低的输出抖动、宽的电源范围 ,使用级连电流镜像消除过冲注入电流。基于 CMOS0 .3 5工艺 ,用 SPECTRE对该电路进行仿真 ,改进后的电路可消除 1.2 m A的注入电流 ,稳定工作在 2 5 /12 .5 MHz下 ,其最低工作电压为 2 .2 V,静态功耗为 0 .44m A,达到设计目标。

A modified high performance single-ended charge pump circuit is presented. The circuit is based on the current-steer architecture and the property of separating the bias circuit from the charge and discharge circuit using the operational amplifier. It eliminates overshoot injection current by the cascade current mirror, and has a low out jitter and a wide power supply range. The circuit is simulated by SPECTRE using CMOS 0.35 μm process and the satisfied result is achieved, which eliminates 1.2 mA injection current and operates stably under 25/12.5 MHz with 2.2 V of the lowest voltage, 0.44 mW of static power consumption.