{"title":"一种用于自旋转矩振荡器的可变输入阻抗和自动归零反馈的可变增益放大器","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":"{\"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}","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}
A variable gain amplifier with variable input impedance and auto-zero feedback for spin torque oscillators
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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