{"title":"A Current-Feedback Amplifier with Programmable Gain for MEMS Microphone Read-Out Circuits","authors":"Luca Sant, E. Bach, R. Gaggl, A. Baschirotto","doi":"10.1109/Austrochip.2019.00012","DOIUrl":null,"url":null,"abstract":"This work presents a read-out amplifier for capacitive sensors, in particular for MEMS microphones, based on a current-feedback topology. This architecture allows for an extensive gain range while keeping the input impedance as well as the amplifier bandwidth independent of the selected gain. Noise performance is maximized and signal attenuation due to parasitic effects is minimized and stays constant at all gain settings. This architecture has been used for the design of an interface circuit for a MEMS microphone in a standard 0.13µm CMOS process.","PeriodicalId":6724,"journal":{"name":"2019 Austrochip Workshop on Microelectronics (Austrochip)","volume":"23 1","pages":"1-5"},"PeriodicalIF":0.0000,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"5","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2019 Austrochip Workshop on Microelectronics (Austrochip)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/Austrochip.2019.00012","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 5
Abstract
This work presents a read-out amplifier for capacitive sensors, in particular for MEMS microphones, based on a current-feedback topology. This architecture allows for an extensive gain range while keeping the input impedance as well as the amplifier bandwidth independent of the selected gain. Noise performance is maximized and signal attenuation due to parasitic effects is minimized and stays constant at all gain settings. This architecture has been used for the design of an interface circuit for a MEMS microphone in a standard 0.13µm CMOS process.
这项工作提出了一种基于电流反馈拓扑的电容式传感器读出放大器，特别是用于MEMS麦克风。这种结构允许广泛的增益范围，同时保持输入阻抗以及放大器带宽与所选增益无关。噪声性能最大化，信号衰减由于寄生效应最小化，并保持恒定在所有增益设置。该架构已用于标准0.13 μ m CMOS工艺的MEMS麦克风接口电路的设计。
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