{"title":"Frequency compensation in a two-integrator loop Gm-C biquad when realized with single stage OTAs","authors":"I. Uzunov, Boncho Nikov, S. Ouzounov, M. Hristov","doi":"10.1109/ET.2017.8124399","DOIUrl":null,"url":null,"abstract":"The paper considers the design of a two-integrator loop Gm-C second order filter, realized by single stage operational transconductance amplifiers (OTA). Two major problems are discussed: equalizing the maxima of OTA input voltages and unfavorable effect of OTA input capacitances. It is shown OTA input capacitances cause increasing of pole Q-factor and may turn the circuit to unstable. A method for avoiding of this problem is proposed, which could be applied for the other circuits of this class.","PeriodicalId":127983,"journal":{"name":"2017 XXVI International Scientific Conference Electronics (ET)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2017 XXVI International Scientific Conference Electronics (ET)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/ET.2017.8124399","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
The paper considers the design of a two-integrator loop Gm-C second order filter, realized by single stage operational transconductance amplifiers (OTA). Two major problems are discussed: equalizing the maxima of OTA input voltages and unfavorable effect of OTA input capacitances. It is shown OTA input capacitances cause increasing of pole Q-factor and may turn the circuit to unstable. A method for avoiding of this problem is proposed, which could be applied for the other circuits of this class.
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