{"title":"A Novel SAR Fast-Locking Digital PLL: SPICE Modeling and Simulations","authors":"M. Wagdy, Robin Sur","doi":"10.1109/ITNG.2012.108","DOIUrl":null,"url":null,"abstract":"A novel fast-locking DPLL based on the Successive-Approximation Register (SAR) is presented and modeled using SPICE. The DPLL has two distinct stages of operation: 1) A coarse-tuning stage which employs frequency tracking to bring the VCO and reference frequencies close to each other and 2) a fine tuning stage which uses conventional phase tracking to achieve a complete lock. The coarse-tuning stage consists of a frequency comparator, a SAR, and a D/A converter (DAC). The architecture of the SAR DPLL has been designed and simulated in 250nm SPICE. The fast-locking DPLL was found to be 1.5 to 3 times faster than the conventional DPLL.","PeriodicalId":117236,"journal":{"name":"2012 Ninth International Conference on Information Technology - New Generations","volume":"792 ","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2012-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"4","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2012 Ninth International Conference on Information Technology - New Generations","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/ITNG.2012.108","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 4
Abstract
A novel fast-locking DPLL based on the Successive-Approximation Register (SAR) is presented and modeled using SPICE. The DPLL has two distinct stages of operation: 1) A coarse-tuning stage which employs frequency tracking to bring the VCO and reference frequencies close to each other and 2) a fine tuning stage which uses conventional phase tracking to achieve a complete lock. The coarse-tuning stage consists of a frequency comparator, a SAR, and a D/A converter (DAC). The architecture of the SAR DPLL has been designed and simulated in 250nm SPICE. The fast-locking DPLL was found to be 1.5 to 3 times faster than the conventional DPLL.