{"title":"带MASH -1-1-1 σ δ调制器的分数n频率合成器的杂散抑制技术","authors":"V. Tamilselvan, Maran Ponnambalam, P. Chandramani","doi":"10.1109/ICCSP.2014.6949973","DOIUrl":null,"url":null,"abstract":"A fourth order MASH Sigma Delta modulator based fractional-N frequency synthesizer was designed and validated as a Matlab/Simulink macro- model. Use of MASH achieves a better noise shaping for the frequencies generated by the synthesizer. With a reference frequency of 20MHz, the fractional-N frequency synthesizer achieves a synthesized frequency range of 200MHz to 220MHz with 2 MHz resolution. The macro-model has a gain margin of 6.02dB and a phase margin of 39.7°, ensuring the stability of the closed loop system with settling time of 3.32μ sec. Spurs that were introduced by the fractional feedback and reference input are removed through notch type Comb filter.","PeriodicalId":149965,"journal":{"name":"2014 International Conference on Communication and Signal Processing","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2014-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"2","resultStr":"{\"title\":\"Spur reduction technique for fractional-N frequency synthesizer with MASH 1-1-1-1 Sigma Delta modulator\",\"authors\":\"V. Tamilselvan, Maran Ponnambalam, P. Chandramani\",\"doi\":\"10.1109/ICCSP.2014.6949973\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"A fourth order MASH Sigma Delta modulator based fractional-N frequency synthesizer was designed and validated as a Matlab/Simulink macro- model. Use of MASH achieves a better noise shaping for the frequencies generated by the synthesizer. With a reference frequency of 20MHz, the fractional-N frequency synthesizer achieves a synthesized frequency range of 200MHz to 220MHz with 2 MHz resolution. The macro-model has a gain margin of 6.02dB and a phase margin of 39.7°, ensuring the stability of the closed loop system with settling time of 3.32μ sec. Spurs that were introduced by the fractional feedback and reference input are removed through notch type Comb filter.\",\"PeriodicalId\":149965,\"journal\":{\"name\":\"2014 International Conference on Communication and Signal Processing\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2014-04-03\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"2\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"2014 International Conference on Communication and Signal Processing\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1109/ICCSP.2014.6949973\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"2014 International Conference on Communication and Signal Processing","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/ICCSP.2014.6949973","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Spur reduction technique for fractional-N frequency synthesizer with MASH 1-1-1-1 Sigma Delta modulator
A fourth order MASH Sigma Delta modulator based fractional-N frequency synthesizer was designed and validated as a Matlab/Simulink macro- model. Use of MASH achieves a better noise shaping for the frequencies generated by the synthesizer. With a reference frequency of 20MHz, the fractional-N frequency synthesizer achieves a synthesized frequency range of 200MHz to 220MHz with 2 MHz resolution. The macro-model has a gain margin of 6.02dB and a phase margin of 39.7°, ensuring the stability of the closed loop system with settling time of 3.32μ sec. Spurs that were introduced by the fractional feedback and reference input are removed through notch type Comb filter.
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