{"title":"A variable gain amplifier with variable input impedance and auto-zero feedback for spin torque oscillators","authors":"M. Kreissig, Alexander Richter, F. Ellinger","doi":"10.1109/SMICND.2015.7355196","DOIUrl":null,"url":null,"abstract":"This work presents a highly adaptive circuit for amplifying a signal of a spin torque oscillator (STO). For achieving power matching with respect to the STO's variable output resistance, the input impedance of the amplifier can be tuned in the range of 50 Ω to more than 500 Ω. Multiple amplifier stages are deployed leading to accumulated gain of >60 dB at 1 GHz. The -3 dB bandwidth of 1.5 GHz makes this amplifier suitable for vortex STO. A fully integrated and adjustable auto-zero feedback for compensating the DC-offset has been implemented in order to convert the single ended signal into a differential one. The circuit was realized in a 180nm BiCMOS process and includes an I2C-slave interface to adjust on-chip currents and control signal switches.","PeriodicalId":325576,"journal":{"name":"2015 International Semiconductor Conference (CAS)","volume":"65 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.2015.7355196","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 work presents a highly adaptive circuit for amplifying a signal of a spin torque oscillator (STO). For achieving power matching with respect to the STO's variable output resistance, the input impedance of the amplifier can be tuned in the range of 50 Ω to more than 500 Ω. Multiple amplifier stages are deployed leading to accumulated gain of >60 dB at 1 GHz. The -3 dB bandwidth of 1.5 GHz makes this amplifier suitable for vortex STO. A fully integrated and adjustable auto-zero feedback for compensating the DC-offset has been implemented in order to convert the single ended signal into a differential one. The circuit was realized in a 180nm BiCMOS process and includes an I2C-slave interface to adjust on-chip currents and control signal switches.
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