{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/16215"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/16215","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"BER-optimal analog-to-digital converters for communication links","abstract":"In this thesis, we propose BER-optimal analog-to-digital converters (ADC) where quantization levels and thresholds are set non-uniformly to minimize the bit-error rate (BER). This is in contrast to present-day ADCs which act as transparent waveform preservers. We define the ADC shaping gain metric in order to quantify the improvements. Simulations for various communication channels show that the BER-optimal ADC achieves shaping gains that range from 2.5 dB for channels with low intersymbol interference (ISI) to more than 30 dB for channels with high ISI. Moreover, a 3 bit BER-optimal ADC achieves at least as low a BER as a 4 bit uniform ADC. For flash converters, this corresponds to a power reduction by 2x. Look-up table based equalizers compatible with BER-optimal ADCs are shown to reduce the power up to 47% and the area up to 66% in a 45 nm CMOS process. The shaping gain due to BER-optimal ADCs can be exploited to lower peak transmit swings at the transmitter or decrease power consumption of the ADC.","abstract_html":"In this thesis, we propose BER-optimal analog-to-digital converters (ADC) where quantization levels and thresholds are set non-uniformly to minimize the bit-error rate (BER). This is in contrast to present-day ADCs which act as transparent waveform preservers. We define the ADC shaping gain metric in order to quantify the improvements. Simulations for various communication channels show that the BER-optimal ADC achieves shaping gains that range from 2.5 dB for channels with low intersymbol interference (ISI) to more than 30 dB for channels with high ISI. Moreover, a 3 bit BER-optimal ADC achieves at least as low a BER as a 4 bit uniform ADC. For flash converters, this corresponds to a power reduction by 2x. Look-up table based equalizers compatible with BER-optimal ADCs are shown to reduce the power up to 47% and the area up to 66% in a 45 nm CMOS process. The shaping gain due to BER-optimal ADCs can be exploited to lower peak transmit swings at the transmitter or decrease power consumption of the ADC.","abstract_has_math":false,"creators":["Lu, Minwei"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Electrical & Computer Engr","degree_department":null,"school":null,"contributors":["Shanbhag, Naresh R.","Singer, Andrew C."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2010,"date_issued":"2010-05-19T18:40:50Z","date_published":"2010-05-19T18:40:50Z","updated_at":"2026-07-22T22:25:08Z","subjects":["BER-optimal","Analog-to-digital converters (ADC)","communication links","ADC shaping gain","Bit-error rate (BER)"],"languages":["en"],"rights":["Copyright 2010 Minwei Lu"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/16215","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Shanbhag, Naresh R.","Singer, Andrew C."]},{"key":"dc:creator","label":"Author","values":["Lu, Minwei"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2010-05-19T18:40:50Z","2010-5"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Electrical & Computer Engr"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["BER-optimal","Analog-to-digital converters (ADC)","communication links","ADC shaping gain","Bit-error rate (BER)"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2010 Minwei Lu"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/16215"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["In this thesis, we propose BER-optimal analog-to-digital converters (ADC) where quantization levels and thresholds are set non-uniformly to minimize the bit-error rate (BER). This is in contrast to present-day ADCs which act as transparent waveform preservers. We define the ADC shaping gain metric in order to quantify the improvements. Simulations for various communication channels show that the BER-optimal ADC achieves shaping gains that range from 2.5 dB for channels with low intersymbol interference (ISI) to more than 30 dB for channels with high ISI. Moreover, a 3 bit BER-optimal ADC achieves at least as low a BER as a 4 bit uniform ADC. For flash converters, this corresponds to a power reduction by 2x. Look-up table based equalizers compatible with BER-optimal ADCs are shown to reduce the power up to 47% and the area up to 66% in a 45 nm CMOS process. The shaping gain due to BER-optimal ADCs can be exploited to lower peak transmit swings at the transmitter or decrease power consumption of the ADC.","Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2010-04-15T18:46:16Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 1 Lu_Minwei.pdf: 583794 bytes, checksum: 13c030923737a385e4c62c4513b0aaf8 (MD5)","Made available in DSpace on 2010-05-19T18:40:50Z (GMT). No. of bitstreams: 2 Lu_Minwei.pdf: 583794 bytes, checksum: 13c030923737a385e4c62c4513b0aaf8 (MD5) license.txt: 4055 bytes, checksum: f96bac9f99b7ec94dc96f6daa9a2ac37 (MD5)"]},{"key":"dc:title","label":"Title","values":["BER-optimal analog-to-digital converters for communication links"]}]}],"canonical_facts":{"dc:contributor":["Shanbhag, Naresh R.","Singer, Andrew C."],"dc:creator":["Lu, Minwei"],"dc:date":["2010-05-19T18:40:50Z","2010-5"],"dc:description":["In this thesis, we propose BER-optimal analog-to-digital converters (ADC) where quantization levels and thresholds are set non-uniformly to minimize the bit-error rate (BER). This is in contrast to present-day ADCs which act as transparent waveform preservers. We define the ADC shaping gain metric in order to quantify the improvements. Simulations for various communication channels show that the BER-optimal ADC achieves shaping gains that range from 2.5 dB for channels with low intersymbol interference (ISI) to more than 30 dB for channels with high ISI. Moreover, a 3 bit BER-optimal ADC achieves at least as low a BER as a 4 bit uniform ADC. For flash converters, this corresponds to a power reduction by 2x. Look-up table based equalizers compatible with BER-optimal ADCs are shown to reduce the power up to 47% and the area up to 66% in a 45 nm CMOS process. The shaping gain due to BER-optimal ADCs can be exploited to lower peak transmit swings at the transmitter or decrease power consumption of the ADC.","Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2010-04-15T18:46:16Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 1 Lu_Minwei.pdf: 583794 bytes, checksum: 13c030923737a385e4c62c4513b0aaf8 (MD5)","Made available in DSpace on 2010-05-19T18:40:50Z (GMT). No. of bitstreams: 2 Lu_Minwei.pdf: 583794 bytes, checksum: 13c030923737a385e4c62c4513b0aaf8 (MD5) license.txt: 4055 bytes, checksum: f96bac9f99b7ec94dc96f6daa9a2ac37 (MD5)"],"dc:identifier":["http://hdl.handle.net/2142/16215"],"dc:language":["en"],"dc:rights":["Copyright 2010 Minwei Lu"],"dc:subject":["BER-optimal","Analog-to-digital converters (ADC)","communication links","ADC shaping gain","Bit-error rate (BER)"],"dc:title":["BER-optimal analog-to-digital converters for communication links"],"thesis:degree_discipline":["Electrical & Computer Engr"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["M.S."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:08Z"}