{"id":"https://openalex.org/W3041229157","doi":"https://doi.org/10.1109/tcsii.2020.3007934","title":"A 4.5 G\u03a9-Input Impedance Chopper Amplifier With Embedded DC-Servo and Ripple Reduction Loops for Impedance Boosting to Sub-Hz","display_name":"A 4.5 G\u03a9-Input Impedance Chopper Amplifier With Embedded DC-Servo and Ripple Reduction Loops for Impedance Boosting to Sub-Hz","publication_year":2020,"publication_date":"2020-07-08","ids":{"openalex":"https://openalex.org/W3041229157","doi":"https://doi.org/10.1109/tcsii.2020.3007934","mag":"3041229157"},"language":"en","primary_location":{"id":"doi:10.1109/tcsii.2020.3007934","is_oa":false,"landing_page_url":"https://doi.org/10.1109/tcsii.2020.3007934","pdf_url":null,"source":{"id":"https://openalex.org/S93916849","display_name":"IEEE Transactions on Circuits & Systems II Express Briefs","issn_l":"1549-7747","issn":["1549-7747","1558-3791"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310319808","host_organization_name":"Institute of Electrical and Electronics Engineers","host_organization_lineage":["https://openalex.org/P4310319808"],"host_organization_lineage_names":["Institute of Electrical and Electronics Engineers"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"IEEE Transactions on Circuits and Systems II: Express Briefs","raw_type":"journal-article"},"type":"article","indexed_in":["crossref"],"open_access":{"is_oa":false,"oa_status":"closed","oa_url":null,"any_repository_has_fulltext":false},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5009585337","display_name":"Xuan Thanh Pham","orcid":"https://orcid.org/0000-0001-9979-3220"},"institutions":[{"id":"https://openalex.org/I35928602","display_name":"Kyung Hee University","ror":"https://ror.org/01zqcg218","country_code":"KR","type":"education","lineage":["https://openalex.org/I35928602"]}],"countries":["KR"],"is_corresponding":false,"raw_author_name":"Xuan Thanh Pham","raw_affiliation_strings":["School of Electronics and Information, Kyung Hee University, Yongin, South Korea"],"raw_orcid":"https://orcid.org/0000-0001-9979-3220","affiliations":[{"raw_affiliation_string":"School of Electronics and Information, Kyung Hee University, Yongin, South Korea","institution_ids":["https://openalex.org/I35928602"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5085029151","display_name":"Duc Nha Duong","orcid":"https://orcid.org/0000-0001-6543-1168"},"institutions":[{"id":"https://openalex.org/I35928602","display_name":"Kyung Hee University","ror":"https://ror.org/01zqcg218","country_code":"KR","type":"education","lineage":["https://openalex.org/I35928602"]}],"countries":["KR"],"is_corresponding":false,"raw_author_name":"Duc Nha Duong","raw_affiliation_strings":["School of Electronics and Information, Kyung Hee University, Yongin, South Korea"],"raw_orcid":"https://orcid.org/0000-0001-6543-1168","affiliations":[{"raw_affiliation_string":"School of Electronics and Information, Kyung Hee University, Yongin, South Korea","institution_ids":["https://openalex.org/I35928602"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5107340507","display_name":"Ngoc Tan Nguyen","orcid":"https://orcid.org/0000-0003-0282-2000"},"institutions":[{"id":"https://openalex.org/I35928602","display_name":"Kyung Hee University","ror":"https://ror.org/01zqcg218","country_code":"KR","type":"education","lineage":["https://openalex.org/I35928602"]}],"countries":["KR"],"is_corresponding":false,"raw_author_name":"Ngoc Tan Nguyen","raw_affiliation_strings":["School of Electronics and Information, Kyung Hee University, Yongin, South Korea"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"School of Electronics and Information, Kyung Hee University, Yongin, South Korea","institution_ids":["https://openalex.org/I35928602"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5046386361","display_name":"Nguy\u1ec5n V\u0103n Tr\u01b0\u1edfng","orcid":"https://orcid.org/0000-0001-6594-8562"},"institutions":[{"id":"https://openalex.org/I35928602","display_name":"Kyung Hee University","ror":"https://ror.org/01zqcg218","country_code":"KR","type":"education","lineage":["https://openalex.org/I35928602"]}],"countries":["KR"],"is_corresponding":false,"raw_author_name":"Nguyen Van Truong","raw_affiliation_strings":["School of Electronics and Information, Kyung Hee University, Yongin, South Korea"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"School of Electronics and Information, Kyung Hee University, Yongin, South Korea","institution_ids":["https://openalex.org/I35928602"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5100702747","display_name":"Jong\u2010Wook Lee","orcid":"https://orcid.org/0000-0002-9160-2183"},"institutions":[{"id":"https://openalex.org/I35928602","display_name":"Kyung Hee University","ror":"https://ror.org/01zqcg218","country_code":"KR","type":"education","lineage":["https://openalex.org/I35928602"]}],"countries":["KR"],"is_corresponding":false,"raw_author_name":"Jong-Wook Lee","raw_affiliation_strings":["School of Electronics and Information, Kyung Hee University, Yongin, South Korea"],"raw_orcid":"https://orcid.org/0000-0002-9160-2183","affiliations":[{"raw_affiliation_string":"School of Electronics and Information, Kyung Hee University, Yongin, South Korea","institution_ids":["https://openalex.org/I35928602"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":5,"corresponding_author_ids":[],"corresponding_institution_ids":[],"apc_list":null,"apc_paid":null,"fwci":1.1328,"has_fulltext":false,"cited_by_count":20,"citation_normalized_percentile":{"value":0.7554331,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":96,"max":98},"biblio":{"volume":"68","issue":"1","first_page":"116","last_page":"120"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10323","display_name":"Analog and Mixed-Signal Circuit Design","score":0.9998999834060669,"subfield":{"id":"https://openalex.org/subfields/2204","display_name":"Biomedical Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T10323","display_name":"Analog and Mixed-Signal Circuit Design","score":0.9998999834060669,"subfield":{"id":"https://openalex.org/subfields/2204","display_name":"Biomedical Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T11601","display_name":"Neuroscience and Neural Engineering","score":0.9988999962806702,"subfield":{"id":"https://openalex.org/subfields/2804","display_name":"Cellular and Molecular Neuroscience"},"field":{"id":"https://openalex.org/fields/28","display_name":"Neuroscience"},"domain":{"id":"https://openalex.org/domains/1","display_name":"Life Sciences"}},{"id":"https://openalex.org/T10502","display_name":"Advanced Memory and Neural Computing","score":0.9973000288009644,"subfield":{"id":"https://openalex.org/subfields/2208","display_name":"Electrical and Electronic Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/amplifier","display_name":"Amplifier","score":0.5283135771751404},{"id":"https://openalex.org/keywords/electrical-impedance","display_name":"Electrical impedance","score":0.4871327579021454},{"id":"https://openalex.org/keywords/boosting","display_name":"Boosting (machine learning)","score":0.4846061170101166},{"id":"https://openalex.org/keywords/chopper","display_name":"Chopper","score":0.4838896691799164},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.45078837871551514},{"id":"https://openalex.org/keywords/electronic-engineering","display_name":"Electronic engineering","score":0.3799367845058441},{"id":"https://openalex.org/keywords/physics","display_name":"Physics","score":0.3514717221260071},{"id":"https://openalex.org/keywords/topology","display_name":"Topology (electrical circuits)","score":0.3431134521961212},{"id":"https://openalex.org/keywords/cmos","display_name":"CMOS","score":0.33285847306251526},{"id":"https://openalex.org/keywords/electrical-engineering","display_name":"Electrical engineering","score":0.29175591468811035},{"id":"https://openalex.org/keywords/engineering","display_name":"Engineering","score":0.16228395700454712},{"id":"https://openalex.org/keywords/artificial-intelligence","display_name":"Artificial intelligence","score":0.1499941647052765},{"id":"https://openalex.org/keywords/voltage","display_name":"Voltage","score":0.09645587205886841}],"concepts":[{"id":"https://openalex.org/C194257627","wikidata":"https://www.wikidata.org/wiki/Q211554","display_name":"Amplifier","level":3,"score":0.5283135771751404},{"id":"https://openalex.org/C17829176","wikidata":"https://www.wikidata.org/wiki/Q179043","display_name":"Electrical impedance","level":2,"score":0.4871327579021454},{"id":"https://openalex.org/C46686674","wikidata":"https://www.wikidata.org/wiki/Q466303","display_name":"Boosting (machine learning)","level":2,"score":0.4846061170101166},{"id":"https://openalex.org/C2780191706","wikidata":"https://www.wikidata.org/wiki/Q191658","display_name":"Chopper","level":3,"score":0.4838896691799164},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.45078837871551514},{"id":"https://openalex.org/C24326235","wikidata":"https://www.wikidata.org/wiki/Q126095","display_name":"Electronic engineering","level":1,"score":0.3799367845058441},{"id":"https://openalex.org/C121332964","wikidata":"https://www.wikidata.org/wiki/Q413","display_name":"Physics","level":0,"score":0.3514717221260071},{"id":"https://openalex.org/C184720557","wikidata":"https://www.wikidata.org/wiki/Q7825049","display_name":"Topology (electrical circuits)","level":2,"score":0.3431134521961212},{"id":"https://openalex.org/C46362747","wikidata":"https://www.wikidata.org/wiki/Q173431","display_name":"CMOS","level":2,"score":0.33285847306251526},{"id":"https://openalex.org/C119599485","wikidata":"https://www.wikidata.org/wiki/Q43035","display_name":"Electrical engineering","level":1,"score":0.29175591468811035},{"id":"https://openalex.org/C127413603","wikidata":"https://www.wikidata.org/wiki/Q11023","display_name":"Engineering","level":0,"score":0.16228395700454712},{"id":"https://openalex.org/C154945302","wikidata":"https://www.wikidata.org/wiki/Q11660","display_name":"Artificial intelligence","level":1,"score":0.1499941647052765},{"id":"https://openalex.org/C165801399","wikidata":"https://www.wikidata.org/wiki/Q25428","display_name":"Voltage","level":2,"score":0.09645587205886841}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1109/tcsii.2020.3007934","is_oa":false,"landing_page_url":"https://doi.org/10.1109/tcsii.2020.3007934","pdf_url":null,"source":{"id":"https://openalex.org/S93916849","display_name":"IEEE Transactions on Circuits & Systems II Express Briefs","issn_l":"1549-7747","issn":["1549-7747","1558-3791"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310319808","host_organization_name":"Institute of Electrical and Electronics Engineers","host_organization_lineage":["https://openalex.org/P4310319808"],"host_organization_lineage_names":["Institute of Electrical and Electronics Engineers"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"IEEE Transactions on Circuits and Systems II: Express Briefs","raw_type":"journal-article"}],"best_oa_location":null,"sustainable_development_goals":[{"id":"https://metadata.un.org/sdg/7","score":0.5,"display_name":"Affordable and clean energy"}],"awards":[{"id":"https://openalex.org/G2772137799","display_name":null,"funder_award_id":"2018R1A2A2A0501862113","funder_id":"https://openalex.org/F4320322120","funder_display_name":"National Research Foundation of Korea"},{"id":"https://openalex.org/G4970180092","display_name":null,"funder_award_id":"2020M3H2A107678611","funder_id":"https://openalex.org/F4320322120","funder_display_name":"National Research Foundation of Korea"}],"funders":[{"id":"https://openalex.org/F4320322120","display_name":"National Research Foundation of Korea","ror":"https://ror.org/013aysd81"}],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":10,"referenced_works":["https://openalex.org/W2047700412","https://openalex.org/W2108560657","https://openalex.org/W2109472370","https://openalex.org/W2309936867","https://openalex.org/W2396217863","https://openalex.org/W2582798323","https://openalex.org/W2739770034","https://openalex.org/W2753806916","https://openalex.org/W6741829979","https://openalex.org/W6993075465"],"related_works":["https://openalex.org/W2899084033","https://openalex.org/W2376014514","https://openalex.org/W2391645806","https://openalex.org/W2387338363","https://openalex.org/W20937862","https://openalex.org/W2181931672","https://openalex.org/W2080606327","https://openalex.org/W2125652721","https://openalex.org/W2900802911","https://openalex.org/W1540371141"],"abstract_inverted_index":{"Achieving":[0],"a":[1,30,70,85,111,117,129,139,146,155],"high":[2],"input":[3],"impedance":[4,23,80],"Z":[5,87,101,175,198],"<sub":[6,88,102,176,199],"xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"":[7,89,103,167,177,200],"xmlns:xlink=\"http://www.w3.org/1999/xlink\">in</sub>":[8,90,104,178,201],"is":[9,126,136,152,179,202,213],"important":[10],"for":[11,116],"the":[12,37,45,50,59,67,92,133,193],"instrumentation":[13,120],"amplifier":[14,121],"(IA)":[15],"performing":[16],"neural":[17],"and":[18,99,132,151],"biopotential":[19],"signal":[20],"sensing.":[21],"Previously,":[22],"boosting":[24,81,105],"techniques":[25],"have":[26],"been":[27],"used":[28],"with":[29,160],"positive":[31],"feedback":[32],"loop":[33,55],"(PFL)":[34],"driven":[35,43],"by":[36,44,181,204],"output":[38],"or":[39,72,82],"auxiliary":[40],"(AUX)":[41],"path":[42,135],"input.":[46],"We":[47],"propose":[48,110],"that":[49,174],"conventional":[51,196],"approach":[52,113],"to":[53,107,114,185,192],"DC-servo":[54],"(DSL),":[56],"which":[57],"blocks":[58],"electrode":[60],"offset":[61],"(EOS),":[62],"does":[63],"not":[64],"fully":[65],"enable":[66],"function":[68],"of":[69,84,148,163,210],"PFL":[71],"AUX":[73,134],"path.":[74],"This":[75],"results":[76,172],"in":[77,91],"either":[78],"limited":[79],"reduction":[83],"low-frequency":[86],"sub-Hz":[93],"band.":[94],"To":[95],"solve":[96],"this":[97],"problem":[98],"achieve":[100],"down":[106],"sub-Hz,":[108],"we":[109],"new":[112],"DSL":[115,125],"capacitively-coupled":[118],"chopper":[119],"(CCIA).":[122],"The":[123,143,170],"proposed":[124],"realized":[127],"using":[128,138,154,195],"30-nA":[130],"opamp,":[131],"designed":[137],"450-nA":[140],"duty-cycled":[141],"buffer.":[142],"CCIA":[144,194],"achieves":[145],"gain":[147],"40":[149],"dB":[150],"implemented":[153],"0.18":[156],"\u03bcm":[157],"CMOS":[158],"process":[159],"an":[161],"area":[162],"0.19":[164],"mm":[165],"<sup":[166],"xmlns:xlink=\"http://www.w3.org/1999/xlink\">2</sup>":[168],".":[169],"measured":[171],"show":[173],"increased":[180],"184":[182],"times":[183],"up":[184],"4.6":[186],"GQ":[187],"at":[188,215],"0.01":[189],"Hz.":[190],"Compared":[191],"DSL,":[197],"improved":[203],"7.8":[205],"times.":[206],"An":[207],"input-referred":[208],"noise":[209],"2.1":[211],"\u03bcVrms":[212],"achieved":[214],"2.14":[216],"\u03bcW.":[217]},"counts_by_year":[{"year":2025,"cited_by_count":3},{"year":2024,"cited_by_count":4},{"year":2023,"cited_by_count":4},{"year":2022,"cited_by_count":5},{"year":2021,"cited_by_count":4}],"updated_date":"2026-06-11T09:08:48.828518","created_date":"2025-10-10T00:00:00"}
