{"title":"Balanced log-domain filters for VHF applications","authors":"M. El-Gamal, V. Leung, G. Roberts","doi":"10.1109/ISCAS.1997.608780","DOIUrl":null,"url":null,"abstract":"General transfer characteristics of log-domain integrators necessary to realize different log-domain filter topologies, based on LC ladder synthesis, are described. As an example, a transistor-level all-NPN differential log-domain integrator is proposed and used to implement a fully tunable balanced 600 MHz biquad. The integrator is then used to implement 4/sup th/ and 6/sup th/-order balanced bandpass filters. The sensitivity of log-domain integrators to DC biasing offsets is discussed. These offsets are minimized using a BiCMOS common mode feedback circuit. Simulation results are presented with an emphasis on distortion analysis.","PeriodicalId":68559,"journal":{"name":"电路与系统学报","volume":"58 1","pages":"493-496 vol.1"},"PeriodicalIF":0.0000,"publicationDate":"1997-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"20","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"电路与系统学报","FirstCategoryId":"1093","ListUrlMain":"https://doi.org/10.1109/ISCAS.1997.608780","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 20
Abstract
General transfer characteristics of log-domain integrators necessary to realize different log-domain filter topologies, based on LC ladder synthesis, are described. As an example, a transistor-level all-NPN differential log-domain integrator is proposed and used to implement a fully tunable balanced 600 MHz biquad. The integrator is then used to implement 4/sup th/ and 6/sup th/-order balanced bandpass filters. The sensitivity of log-domain integrators to DC biasing offsets is discussed. These offsets are minimized using a BiCMOS common mode feedback circuit. Simulation results are presented with an emphasis on distortion analysis.
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