应用于PLL的改进型自校准CMOS电荷泵电路  

A Modified Auto-Calibrated CMOS Charge-Pump for PLL

作　　者：杜占坤[1] 郭慧民[1] 陈杰[1] 

机构地区：[1]中国科学院微电子研究所,北京100029

出　　处：《电子器件》2007年第6期2032-2035,共4页Chinese Journal of Electron Devices

基　　金：国家自然科学基金项目资助(90307012)

摘　　要：为提高锁相环中自校准电荷泵电路的稳定性,提出了一种改进型宽摆幅自校准CMOS电荷泵电路.该电路通过引入宽摆幅自校准反馈回路,使电荷泵在输出电压变化范围较大时,UP/DOWN两个开关电流完全匹配,而且该电路不需要专门的频率补偿即可确保绝对稳定.该电荷泵采用0.25μm CMOS混合信号工艺实现.当供电电压2.5V,电荷泵输出节点电压在0.3~2.2V范围内变化时,UP和DOWN电流差值小于2%.To improve the stability of the auto-calibrated charge pump (CP) in PLL,a modified wide-swing auto-calibrated CMOS charge-pump is proposed. With a novel wide-swing auto-calibration feedback loop, the CP’s two switched currents match very well. The circuit has a good stability without dedicated frequency compensation. The CP is implemented in 0.25 μm CMOS mixed-signal 1P5M process. While the output node voltage varies from 0.3 V to 2.2 V under a 2.5 V supply, the difference of two switched currents is less t...

关 键 词：锁相环 电荷泵 自校准 电流匹配 

分 类 号：TN432[电子电信—微电子学与固体电子学]