{"title":"利用限流器设计基于开关电容的降压变换器以提高效率和输出纹波","authors":"Tamal Das, P. Mandal","doi":"10.1109/VLSI.Design.2009.43","DOIUrl":null,"url":null,"abstract":"In this paper we are addressing power efficiency and output ripple of an embedded switched-capacitor based DC/DC Buck Converters. Here we propose to use current pump based switched-capacitor circuit in buck converter. The current pump circuit limits transition current of the switched-capacitors and hence, improves power efficiency and reduces output ripple. We have also proposed an equivalent macro model of this type of current pump based switched-capacitor converter which would help to get a better essence of the closed loop stability of the system and would reveal clearly trade-offs among load current, flying capacitance and clock frequency. A transistor level implementation of the proposed buck converter in 0.18µ technology is provided. For a load current of 8mA (maximum)the achieved power efficiency is 72.7% and the output ripple is 27mV. The flying capacitors in the converter are 2x108pF and the load capacitor is 125pF.","PeriodicalId":267121,"journal":{"name":"2009 22nd International Conference on VLSI Design","volume":"161 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2009-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"11","resultStr":"{\"title\":\"Switched-Capacitor Based Buck Converter Design Using Current Limiter for Better Efficiency and Output Ripple\",\"authors\":\"Tamal Das, P. Mandal\",\"doi\":\"10.1109/VLSI.Design.2009.43\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"In this paper we are addressing power efficiency and output ripple of an embedded switched-capacitor based DC/DC Buck Converters. Here we propose to use current pump based switched-capacitor circuit in buck converter. The current pump circuit limits transition current of the switched-capacitors and hence, improves power efficiency and reduces output ripple. We have also proposed an equivalent macro model of this type of current pump based switched-capacitor converter which would help to get a better essence of the closed loop stability of the system and would reveal clearly trade-offs among load current, flying capacitance and clock frequency. A transistor level implementation of the proposed buck converter in 0.18µ technology is provided. For a load current of 8mA (maximum)the achieved power efficiency is 72.7% and the output ripple is 27mV. The flying capacitors in the converter are 2x108pF and the load capacitor is 125pF.\",\"PeriodicalId\":267121,\"journal\":{\"name\":\"2009 22nd International Conference on VLSI Design\",\"volume\":\"161 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2009-01-05\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"11\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"2009 22nd International Conference on VLSI Design\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1109/VLSI.Design.2009.43\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"2009 22nd International Conference on VLSI Design","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/VLSI.Design.2009.43","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Switched-Capacitor Based Buck Converter Design Using Current Limiter for Better Efficiency and Output Ripple
In this paper we are addressing power efficiency and output ripple of an embedded switched-capacitor based DC/DC Buck Converters. Here we propose to use current pump based switched-capacitor circuit in buck converter. The current pump circuit limits transition current of the switched-capacitors and hence, improves power efficiency and reduces output ripple. We have also proposed an equivalent macro model of this type of current pump based switched-capacitor converter which would help to get a better essence of the closed loop stability of the system and would reveal clearly trade-offs among load current, flying capacitance and clock frequency. A transistor level implementation of the proposed buck converter in 0.18µ technology is provided. For a load current of 8mA (maximum)the achieved power efficiency is 72.7% and the output ripple is 27mV. The flying capacitors in the converter are 2x108pF and the load capacitor is 125pF.
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