{"title":"A CMOS frequency-mixing transimpedance amplifier with 5nArms input noise for frequency-domain near-infrared spectroscopy","authors":"Ruida Yun, V. Joyner","doi":"10.1109/BIOCAS.2010.5709615","DOIUrl":null,"url":null,"abstract":"A novel frequency mixing transimpedance amplifier (FM-TIA) is proposed and implemented in 0.18μm CMOS for low-noise detection of sinusoidally-modulated optical signals in frequency-domain near infrared (NIR) spectroscopy instrumentation. The FM-TIA topology employs a T-feedback resistor network incorporating gate-controlled transistors for resistance modulation, enabling operation in both wideband and frequency-mixing mode. In wideband mode, the TIA achieves a transimpedance gain of 110 (dBΩ, 263 MHz bandwidth, 230 nArms total integrated input current noise and 1 dB compression point of 1.65 μA for 4pF photodiode capacitance. In frequency-mixing mode, the amplifier is capable of directly downcon-verting and amplifying photocurrent signals generated by near-infrared excitation light modulated at 100 MHz. The FM-TIA obtains 5 nArms input noise, current-to-voltage conversion gain of 93dBQ, and ldB compression point of 1.1 μA with up to 47 dB dynamic range. The amplifier consumes only 22 mW of power from a 1.8 V supply.","PeriodicalId":440499,"journal":{"name":"2010 Biomedical Circuits and Systems Conference (BioCAS)","volume":"79 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"3","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2010 Biomedical Circuits and Systems Conference (BioCAS)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/BIOCAS.2010.5709615","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
A novel frequency mixing transimpedance amplifier (FM-TIA) is proposed and implemented in 0.18μm CMOS for low-noise detection of sinusoidally-modulated optical signals in frequency-domain near infrared (NIR) spectroscopy instrumentation. The FM-TIA topology employs a T-feedback resistor network incorporating gate-controlled transistors for resistance modulation, enabling operation in both wideband and frequency-mixing mode. In wideband mode, the TIA achieves a transimpedance gain of 110 (dBΩ, 263 MHz bandwidth, 230 nArms total integrated input current noise and 1 dB compression point of 1.65 μA for 4pF photodiode capacitance. In frequency-mixing mode, the amplifier is capable of directly downcon-verting and amplifying photocurrent signals generated by near-infrared excitation light modulated at 100 MHz. The FM-TIA obtains 5 nArms input noise, current-to-voltage conversion gain of 93dBQ, and ldB compression point of 1.1 μA with up to 47 dB dynamic range. The amplifier consumes only 22 mW of power from a 1.8 V supply.
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