高效率双通路片上电荷泵的研究与设计.pdfVIP

第29卷 第7期 半 导 体 学 报 VO1．29 NO．7 2008年7月 JOURNAL OF SEMICONDUCTORS July，2008 Research and Design of an On-—Chip High Efficiency Dual-Output Charge Pump Zhao Menglian，Wu Xiaobo ，Han Shiming，Deng Li，Yan Dongqin，and Yan Xiaolang (Institute of VLSI Design，Zh iang University，Hangzhou 310027，China) Abstract：To meet the demands for different supply voltage levels on S0C required by digital modules like CPU core and analog modules，a novel dual—output charge pump is proposed．The charge pump can output a step·up and a step-down volt— age simultaneously with a high driving capability．The multiple gain pair technique was introduced to enhance its efficien— cy．The proposed co·use technology for capacitors and switch arrays reduced its cost．The charge pump was designed and fabricated in a TSMC 0．35“m mixed．signal CMOS process．A group of analytical equations were derived to model its static characteristics．A state．space model was derived to describe its smal1．signal dynamic behavior．Analytical predictions were verified by Spectre simulation and testing．The consistency of simulated results as well as test results with analytical predic． tions demonstrated the high precision of the derived analytical equations and the developed models． Key words：charge pump；dual output；co·use technology；multi·gains EEACC：2570D CLC number：TN432 Document code：A Article ID：0253．4177(2008)07．1305．08 nals．Therefore，a switched capacitor (SC) DC—DC 1 Introduction converter(charge pump)becomes a good choice fo