{"title":"45纳米技术的神经信号前端放大器","authors":"Jainendra Tripathi, R. S. Tomar, S. Akashe","doi":"10.1109/ICCN.2015.43","DOIUrl":null,"url":null,"abstract":"In this paper, a front-end amplifier is designed in 45nm CMOS technology (previously designed in 180 nm technology) for recording neural signals. This amplifier consists of three stages -(1) a pre-amplifier with a feedback loop, (2) a current gain stage with adjustable gain, and (3) a tunable filter. The first stage is a current-mode pre-amplifier with feedback loop. The feedback loop is used to bypass dc-offset current generated at the electrode-tissue interface. Adjustable current-gain stage is the second stage which is used to adjust the gain of the amplifier by the application of digital signals. Tunable filter (third stage) adjusts the low-pass cut-off frequency for different neural signals. All the stages in the amplifier are current mode circuits. To convert the output current signal of the tunable filter into voltage signal a transimpedance amplifier is used. The measured maximum voltage gain of the amplifier is 72.5 db. The maximum current noise is 23pA/√Hz, and the power consumption is 6μw at 0.8V power supply.","PeriodicalId":431743,"journal":{"name":"2015 International Conference on Communication Networks (ICCN)","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"2","resultStr":"{\"title\":\"Neural signal front-end amplifier in 45 nm technology\",\"authors\":\"Jainendra Tripathi, R. S. Tomar, S. Akashe\",\"doi\":\"10.1109/ICCN.2015.43\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"In this paper, a front-end amplifier is designed in 45nm CMOS technology (previously designed in 180 nm technology) for recording neural signals. This amplifier consists of three stages -(1) a pre-amplifier with a feedback loop, (2) a current gain stage with adjustable gain, and (3) a tunable filter. The first stage is a current-mode pre-amplifier with feedback loop. The feedback loop is used to bypass dc-offset current generated at the electrode-tissue interface. Adjustable current-gain stage is the second stage which is used to adjust the gain of the amplifier by the application of digital signals. Tunable filter (third stage) adjusts the low-pass cut-off frequency for different neural signals. All the stages in the amplifier are current mode circuits. To convert the output current signal of the tunable filter into voltage signal a transimpedance amplifier is used. The measured maximum voltage gain of the amplifier is 72.5 db. The maximum current noise is 23pA/√Hz, and the power consumption is 6μw at 0.8V power supply.\",\"PeriodicalId\":431743,\"journal\":{\"name\":\"2015 International Conference on Communication Networks (ICCN)\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2015-11-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"2\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"2015 International Conference on Communication Networks (ICCN)\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1109/ICCN.2015.43\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"2015 International Conference on Communication Networks (ICCN)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/ICCN.2015.43","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Neural signal front-end amplifier in 45 nm technology
In this paper, a front-end amplifier is designed in 45nm CMOS technology (previously designed in 180 nm technology) for recording neural signals. This amplifier consists of three stages -(1) a pre-amplifier with a feedback loop, (2) a current gain stage with adjustable gain, and (3) a tunable filter. The first stage is a current-mode pre-amplifier with feedback loop. The feedback loop is used to bypass dc-offset current generated at the electrode-tissue interface. Adjustable current-gain stage is the second stage which is used to adjust the gain of the amplifier by the application of digital signals. Tunable filter (third stage) adjusts the low-pass cut-off frequency for different neural signals. All the stages in the amplifier are current mode circuits. To convert the output current signal of the tunable filter into voltage signal a transimpedance amplifier is used. The measured maximum voltage gain of the amplifier is 72.5 db. The maximum current noise is 23pA/√Hz, and the power consumption is 6μw at 0.8V power supply.
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