{"title":"Analysis of a novel active capacitance circuit using BJT and its application to RF bandpass filters","authors":"Il-Soo Kim, Young‐Hoon Chun, S. Yun","doi":"10.1109/MWSYM.2005.1517190","DOIUrl":null,"url":null,"abstract":"This paper presents a novel active capacitance circuit using BJT and RLC series-feedback. It is competitive in the noise performance and the stability by adjusting the feedback elements. We analyze its characteristics in detail and apply it to an RF application by designing a duplexer. The active capacitance circuit can replace the passive capacitors of resonators in Rx and Tx BPF, which provide negative resistance to compensate for parasitic resistance of inductors. With the detailed analysis, we can obtain the frequency range as well as the maximum value of negative resistance. The active duplexer is designed realized at cellular at Rx (824/spl sim/849 MHz) and Tx (869/spl sim/894 MHz) bands.","PeriodicalId":13133,"journal":{"name":"IEEE MTT-S International Microwave Symposium Digest, 2005.","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2005-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"13","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE MTT-S International Microwave Symposium Digest, 2005.","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/MWSYM.2005.1517190","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 13
Abstract
This paper presents a novel active capacitance circuit using BJT and RLC series-feedback. It is competitive in the noise performance and the stability by adjusting the feedback elements. We analyze its characteristics in detail and apply it to an RF application by designing a duplexer. The active capacitance circuit can replace the passive capacitors of resonators in Rx and Tx BPF, which provide negative resistance to compensate for parasitic resistance of inductors. With the detailed analysis, we can obtain the frequency range as well as the maximum value of negative resistance. The active duplexer is designed realized at cellular at Rx (824/spl sim/849 MHz) and Tx (869/spl sim/894 MHz) bands.
京公网安备 11010802042870号
京ICP备2023020795号-1
分享
求助内容：
应助结果提醒方式：
扫码关注我们
