{"title":"A 280μW audio continuous-time ΔΣ modulator with 103dB DR and 102dB A-Weighted SNR","authors":"Amrith Sukumaran, S. Pavan","doi":"10.1109/ASSCC.2013.6691063","DOIUrl":null,"url":null,"abstract":"An optimally designed FIR feedback DAC is used in a third order, single bit continuous-time delta sigma modulator to reduce power dissipation and jitter sensitivity. The loop filter is carefully stabilized for the delay added by the FIR DAC. A current reuse two stage feedforward compensated opamp minimizes current consumption in the first integrator. The efficacy of our techniques is borne out by measurements from a 17 bit audio converter designed in a 0.18 μm CMOS technology. It achieves 103 dB dynamic range, 102 dB A-Weighted SNR and 106 dB SFDR in a 24 kHz bandwidth and dissipates 280 μW from a 1.8 V supply.","PeriodicalId":296544,"journal":{"name":"2013 IEEE Asian Solid-State Circuits Conference (A-SSCC)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2013-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"7","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2013 IEEE Asian Solid-State Circuits Conference (A-SSCC)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/ASSCC.2013.6691063","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 7
Abstract
An optimally designed FIR feedback DAC is used in a third order, single bit continuous-time delta sigma modulator to reduce power dissipation and jitter sensitivity. The loop filter is carefully stabilized for the delay added by the FIR DAC. A current reuse two stage feedforward compensated opamp minimizes current consumption in the first integrator. The efficacy of our techniques is borne out by measurements from a 17 bit audio converter designed in a 0.18 μm CMOS technology. It achieves 103 dB dynamic range, 102 dB A-Weighted SNR and 106 dB SFDR in a 24 kHz bandwidth and dissipates 280 μW from a 1.8 V supply.
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