{"title":"一种新颖的低压开关型opamp连续共模反馈","authors":"M. Ali-Bakhshian, K. Sadeghi","doi":"10.1145/1013235.1013308","DOIUrl":null,"url":null,"abstract":"A novel rail-to-rail and fast continuous-time common-mode feedback (CMFB) strategy is presented for low-voltage switched-opamp (SO) circuits. The threshold voltage change due to bulk signal is used to measure the output voltage. To satisfy speed requirements, averaging common-mode (CM) level and amplifying error signal are realized in a single block. Finally, the measured CM level is controlled by applying an error-voltage dependent current to the output nodes. As a design example, a modified low-voltage switched-opamp in a cascade 2-1 delta-sigma modulator adopting the proposed technique is presented. SPICE simulation using a 0.18 /spl mu/m technology and V/sub DD/=0.9 V is provided which confirms the expected accuracy and speed of the CMFB circuitry.","PeriodicalId":120002,"journal":{"name":"Proceedings of the 2004 International Symposium on Low Power Electronics and Design (IEEE Cat. No.04TH8758)","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2004-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"5","resultStr":"{\"title\":\"A novel continuous-time common-mode feedback for low-voltage switched-OPAMP\",\"authors\":\"M. Ali-Bakhshian, K. Sadeghi\",\"doi\":\"10.1145/1013235.1013308\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"A novel rail-to-rail and fast continuous-time common-mode feedback (CMFB) strategy is presented for low-voltage switched-opamp (SO) circuits. The threshold voltage change due to bulk signal is used to measure the output voltage. To satisfy speed requirements, averaging common-mode (CM) level and amplifying error signal are realized in a single block. Finally, the measured CM level is controlled by applying an error-voltage dependent current to the output nodes. As a design example, a modified low-voltage switched-opamp in a cascade 2-1 delta-sigma modulator adopting the proposed technique is presented. SPICE simulation using a 0.18 /spl mu/m technology and V/sub DD/=0.9 V is provided which confirms the expected accuracy and speed of the CMFB circuitry.\",\"PeriodicalId\":120002,\"journal\":{\"name\":\"Proceedings of the 2004 International Symposium on Low Power Electronics and Design (IEEE Cat. No.04TH8758)\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2004-08-09\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"5\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Proceedings of the 2004 International Symposium on Low Power Electronics and Design (IEEE Cat. No.04TH8758)\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1145/1013235.1013308\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Proceedings of the 2004 International Symposium on Low Power Electronics and Design (IEEE Cat. No.04TH8758)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1145/1013235.1013308","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
A novel continuous-time common-mode feedback for low-voltage switched-OPAMP
A novel rail-to-rail and fast continuous-time common-mode feedback (CMFB) strategy is presented for low-voltage switched-opamp (SO) circuits. The threshold voltage change due to bulk signal is used to measure the output voltage. To satisfy speed requirements, averaging common-mode (CM) level and amplifying error signal are realized in a single block. Finally, the measured CM level is controlled by applying an error-voltage dependent current to the output nodes. As a design example, a modified low-voltage switched-opamp in a cascade 2-1 delta-sigma modulator adopting the proposed technique is presented. SPICE simulation using a 0.18 /spl mu/m technology and V/sub DD/=0.9 V is provided which confirms the expected accuracy and speed of the CMFB circuitry.
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