{"title":"用于非侵入性生物医学设备的具有失配误差整形的115.2 db动态范围两步直接转换前端","authors":"Yuxuan Chen;Xianzhi Yang;Jiayi Lin;Zilong Liu;Min Zeng;Qi Wu;Mingyi Chen","doi":"10.1109/LSSC.2025.3548453","DOIUrl":null,"url":null,"abstract":"This article presents a two-step direct-conversion front-end (Direct-FE) for noninvasive wearable biomedical devices. In the first step, a delta modulator (<inline-formula> <tex-math>$\\Delta $ </tex-math></inline-formula> M) with embedded gain is used to implement coarse quantization, while in the second step, a discrete-time sigma delta modulator (DT-<inline-formula> <tex-math>$\\Sigma \\Delta $ </tex-math></inline-formula> M) is used to realize fine quantization. DC-coupled differential difference amplifier (DDA) with resistor-based digital-to-analog converter (RDAC) is adopted as the input stage. Mismatch error shaping (MES) with reduced silicon area is utilized to suppress the mismatch error of the RDAC. The prototype has been implemented in 0.18-<inline-formula> <tex-math>$\\mu $ </tex-math></inline-formula> m BCD process and achieves a peak input range of <inline-formula> <tex-math>$7.64~{\\mathrm {V}_{\\mathrm {pp}}}$ </tex-math></inline-formula>, an input-referred-noise (IRN) of <inline-formula> <tex-math>$1.59~\\mu \\mathrm {V}_{\\mathrm {RMS}}$ </tex-math></inline-formula>, a corresponding dynamic range (DR) of 115.2 dB, while consuming 2.4-mW power. The real physiological signals recording demonstrates its potential capability for wearable bio-potential acquisition, boosting the wearable and fitness application areas.","PeriodicalId":13032,"journal":{"name":"IEEE Solid-State Circuits Letters","volume":"8 ","pages":"69-72"},"PeriodicalIF":2.2000,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"A 115.2-dB Dynamic-Range Two-Step Direct-Conversion Front-End With Mismatch Error Shaping for Noninvasive Biomedical Devices\",\"authors\":\"Yuxuan Chen;Xianzhi Yang;Jiayi Lin;Zilong Liu;Min Zeng;Qi Wu;Mingyi Chen\",\"doi\":\"10.1109/LSSC.2025.3548453\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"This article presents a two-step direct-conversion front-end (Direct-FE) for noninvasive wearable biomedical devices. In the first step, a delta modulator (<inline-formula> <tex-math>$\\\\Delta $ </tex-math></inline-formula> M) with embedded gain is used to implement coarse quantization, while in the second step, a discrete-time sigma delta modulator (DT-<inline-formula> <tex-math>$\\\\Sigma \\\\Delta $ </tex-math></inline-formula> M) is used to realize fine quantization. DC-coupled differential difference amplifier (DDA) with resistor-based digital-to-analog converter (RDAC) is adopted as the input stage. Mismatch error shaping (MES) with reduced silicon area is utilized to suppress the mismatch error of the RDAC. The prototype has been implemented in 0.18-<inline-formula> <tex-math>$\\\\mu $ </tex-math></inline-formula> m BCD process and achieves a peak input range of <inline-formula> <tex-math>$7.64~{\\\\mathrm {V}_{\\\\mathrm {pp}}}$ </tex-math></inline-formula>, an input-referred-noise (IRN) of <inline-formula> <tex-math>$1.59~\\\\mu \\\\mathrm {V}_{\\\\mathrm {RMS}}$ </tex-math></inline-formula>, a corresponding dynamic range (DR) of 115.2 dB, while consuming 2.4-mW power. The real physiological signals recording demonstrates its potential capability for wearable bio-potential acquisition, boosting the wearable and fitness application areas.\",\"PeriodicalId\":13032,\"journal\":{\"name\":\"IEEE Solid-State Circuits Letters\",\"volume\":\"8 \",\"pages\":\"69-72\"},\"PeriodicalIF\":2.2000,\"publicationDate\":\"2025-03-05\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"IEEE Solid-State Circuits Letters\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://ieeexplore.ieee.org/document/10912501/\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"COMPUTER SCIENCE, HARDWARE & ARCHITECTURE\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE Solid-State Circuits Letters","FirstCategoryId":"1085","ListUrlMain":"https://ieeexplore.ieee.org/document/10912501/","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"COMPUTER SCIENCE, HARDWARE & ARCHITECTURE","Score":null,"Total":0}
A 115.2-dB Dynamic-Range Two-Step Direct-Conversion Front-End With Mismatch Error Shaping for Noninvasive Biomedical Devices
This article presents a two-step direct-conversion front-end (Direct-FE) for noninvasive wearable biomedical devices. In the first step, a delta modulator ($\Delta $ M) with embedded gain is used to implement coarse quantization, while in the second step, a discrete-time sigma delta modulator (DT-$\Sigma \Delta $ M) is used to realize fine quantization. DC-coupled differential difference amplifier (DDA) with resistor-based digital-to-analog converter (RDAC) is adopted as the input stage. Mismatch error shaping (MES) with reduced silicon area is utilized to suppress the mismatch error of the RDAC. The prototype has been implemented in 0.18-$\mu $ m BCD process and achieves a peak input range of $7.64~{\mathrm {V}_{\mathrm {pp}}}$ , an input-referred-noise (IRN) of $1.59~\mu \mathrm {V}_{\mathrm {RMS}}$ , a corresponding dynamic range (DR) of 115.2 dB, while consuming 2.4-mW power. The real physiological signals recording demonstrates its potential capability for wearable bio-potential acquisition, boosting the wearable and fitness application areas.