{"title":"On-line digital compensation of analog circuit imperfections for cascaded /spl Sigma//spl Delta/ modulators","authors":"A. Wiesbuer, G. Temes","doi":"10.1109/AMICD.1996.569394","DOIUrl":"https://doi.org/10.1109/AMICD.1996.569394","url":null,"abstract":"Multi-bit cascaded /spl Sigma//spl Delta/ modulators are known to suffer from performance degradation caused by analog circuit imperfections. In this paper, a method is introduced for the adaptive digital on-line compensation of linear errors, such as finite op-amp gain and capacitor mismatch. The method is discussed by considering a two-stage 3/sup rd/-order multi-bit switched-capacitor modulator. Simulations show that nearly perfect compensation can be achieved with only slightly increased hardware complexity. Realizing the considered modulator without digital compensation would require at least 80 db op-amp gain and capacitor accuracy better than 0.05%, and comparably difficult specifications on op-amp settling. The analog circuit requirements are relaxed by the adaptation to 54 dB op-amp gain, 0.4% capacitor accuracy and 1% op-amp settling, which are readily attainable.","PeriodicalId":356572,"journal":{"name":"1996 IEEE-CAS Region 8 Workshop on Analog and Mixed IC Design. Proceedings","volume":"340 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129842955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"All Verilog mixed-signal simulator with analog behavioral and noise models","authors":"M. Mayes, S. Chin","doi":"10.1109/AMICD.1996.569382","DOIUrl":"https://doi.org/10.1109/AMICD.1996.569382","url":null,"abstract":"This paper describes an all Verilog full chip simulation technique using Verilog macro-models for analog functions and a Verilog noise model simulating the affects of digital cross-talk. Correlation between simulated results and a prototype are shown. The prototype is a 16-bit 1Msample/s pipelined analog-to-digital converter (ADC) with on chip 32-bit micro-controller. Models for operational amplifiers, analog comparators, capacitors, analog switches, and digital cross-talk noise are developed using Verilog syntax. These Verilog macro models are used to build the analog section of the pipelined ADC and are incorporated in a full chip mixed-signal simulation.","PeriodicalId":356572,"journal":{"name":"1996 IEEE-CAS Region 8 Workshop on Analog and Mixed IC Design. Proceedings","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114274047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}