{"title":"High precision bidirectional chopper amplifier with extended common mode input voltage range","authors":"Nicusor Bortun, Matei Nicolae Stan, G. Brezeanu","doi":"10.1109/SMICND.2015.7355237","DOIUrl":null,"url":null,"abstract":"This paper presents a chopper amplifier for precision current sensing, capable of handling common mode input voltages outside the supply rails. For high common mode rejection ratio (CMRR) and DC gain, the amplifier employs a three-stage topology with nested-Miller frequency compensation. By using the chopping technique, a referred to input offset voltage of ±90μV is obtained. To reduce the output ripples caused by the chopping technique the amplifier employs a notch filter. A CMRR of 123dB has been obtained, considering a supply voltage of 5V, for a common mode input voltage range from 4V to 80V. The stability of the operational amplifier (OA) is ensured for a minimum closed loop gain of 20V/V.","PeriodicalId":325576,"journal":{"name":"2015 International Semiconductor Conference (CAS)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"3","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2015 International Semiconductor Conference (CAS)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/SMICND.2015.7355237","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 3
Abstract
This paper presents a chopper amplifier for precision current sensing, capable of handling common mode input voltages outside the supply rails. For high common mode rejection ratio (CMRR) and DC gain, the amplifier employs a three-stage topology with nested-Miller frequency compensation. By using the chopping technique, a referred to input offset voltage of ±90μV is obtained. To reduce the output ripples caused by the chopping technique the amplifier employs a notch filter. A CMRR of 123dB has been obtained, considering a supply voltage of 5V, for a common mode input voltage range from 4V to 80V. The stability of the operational amplifier (OA) is ensured for a minimum closed loop gain of 20V/V.
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