{"title":"A 31-Feature, 80nW, 0.53mm2 Audio Analog Feature Extractor based on Time-Mode Analog Filterbank Interpolation and Time-Mode Analog Rectification","authors":"S. Ray, P. Kinget","doi":"10.1109/vlsitechnologyandcir46769.2022.9830455","DOIUrl":null,"url":null,"abstract":"To alleviate the feature extraction bottleneck in always-on, on-device Keyword Spotting (KWS), we propose two novel analog circuit techniques that are combined into an efficient analog feature extraction architecture: 1) Time-Mode Analog Filterbank Interpolation (TM-AFI) uses digital XOR gates to double the number of outputs of an analog filterbank, 2) Time-Mode Analog Rectification (TM-AR) uses a single digital XOR gate as an analog full-wave rectifier. Among other analog feature extractor chips using a software classifier for a KWS demo, the 31-feature, 80nW, 0.53mm2 prototype is 18× more power-efficient and 3.3× more area-efficient than the most area- and power-efficient published works, respectively, while maintaining competitive >90% accuracy on 10 keywords.","PeriodicalId":332454,"journal":{"name":"2022 IEEE Symposium on VLSI Technology and Circuits (VLSI Technology and Circuits)","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2022-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2022 IEEE Symposium on VLSI Technology and Circuits (VLSI Technology and Circuits)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/vlsitechnologyandcir46769.2022.9830455","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 1
Abstract
To alleviate the feature extraction bottleneck in always-on, on-device Keyword Spotting (KWS), we propose two novel analog circuit techniques that are combined into an efficient analog feature extraction architecture: 1) Time-Mode Analog Filterbank Interpolation (TM-AFI) uses digital XOR gates to double the number of outputs of an analog filterbank, 2) Time-Mode Analog Rectification (TM-AR) uses a single digital XOR gate as an analog full-wave rectifier. Among other analog feature extractor chips using a software classifier for a KWS demo, the 31-feature, 80nW, 0.53mm2 prototype is 18× more power-efficient and 3.3× more area-efficient than the most area- and power-efficient published works, respectively, while maintaining competitive >90% accuracy on 10 keywords.