{"title":"A fractional-N synthesizer for multi-mode positioning system with constant loop bandwidth","authors":"Yan Feng, Guican Chen","doi":"10.1109/EDSSC.2011.6117626","DOIUrl":null,"url":null,"abstract":"A fractional-N frequency synthesizer with constant loop bandwidth is presented. This synthesizer can be applied to the multi-mode positioning receiver with seven modes in three positioning systems. In all seven modes it has constant loop bandwidth and can work stably by using the improved adjusting method in charge pump biasing current and the linear varactor in VCO (voltage-controlled oscillator). Simulations show that this synthesizer meets the requirements of high performance receiver. For each mode, the in-band and out-of-band phase noises are not lager than •95dBC/Hz and •119dBC/Hz@1MHz, respectively. The variation of normalized IcpKvco/wvco in seven modes is in the range of •8% and 7%. The setting time is less than 21µs. The total power consumption is 15.34mW at 1.8V voltage supply.","PeriodicalId":6363,"journal":{"name":"2011 IEEE International Conference of Electron Devices and Solid-State Circuits","volume":"53 1","pages":"1-2"},"PeriodicalIF":0.0000,"publicationDate":"2011-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"7","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2011 IEEE International Conference of Electron Devices and Solid-State Circuits","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/EDSSC.2011.6117626","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 7
Abstract
A fractional-N frequency synthesizer with constant loop bandwidth is presented. This synthesizer can be applied to the multi-mode positioning receiver with seven modes in three positioning systems. In all seven modes it has constant loop bandwidth and can work stably by using the improved adjusting method in charge pump biasing current and the linear varactor in VCO (voltage-controlled oscillator). Simulations show that this synthesizer meets the requirements of high performance receiver. For each mode, the in-band and out-of-band phase noises are not lager than •95dBC/Hz and •119dBC/Hz@1MHz, respectively. The variation of normalized IcpKvco/wvco in seven modes is in the range of •8% and 7%. The setting time is less than 21µs. The total power consumption is 15.34mW at 1.8V voltage supply.
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