Resolution Enhancement of VCO-based ADCs by Passive Interpolation and Phase Injection

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dc.contributor.author Alvero González, Leidy Mabel
dc.contributor.author Hernández Corporales, Luis
dc.contributor.author Gutiérrez Fernández, Eric
dc.date.accessioned 2022-09-16T10:26:50Z
dc.date.available 2022-09-16T10:26:50Z
dc.date.issued 2020-01-16
dc.identifier.bibliographicCitation 2019 XXXIV Conference on Design of Circuits and Integrated Systems (DCIS), 20-22 November 2019, Bilbao, Spain (pp.: 1-5) Proceedings. IEEE, 2020.
dc.identifier.isbn 978-1-7281-5458-9
dc.identifier.issn 2640-5563
dc.identifier.uri http://hdl.handle.net/10016/35726
dc.description Proceeding of: 2019 XXXIV Conference on Design of Circuits and Integrated Systems (DCIS), 20-22 November 2019, Bilbao, Spain
dc.description.abstract This work describes a simple way to improve the resolution of low-pass voltage-controlled-oscillators based analog-to-digital converters (VCO-based ADCs) implemented with ring-oscillators. We propose to insert a passive resistive network into the differential delay cells of the oscillator to get additional interpolated phases. These interpolated phases are then injected to other similar oscillators. By increasing the number of phases coming from all the oscillators, the effective gain of the system is higher and enhances the resolution of the converter. To validate the idea, a prototype of an open-loop VCO-based ADC was built in VerilogA language with ring-oscillators designed with a 65-nm CMOS process. The results of transient simulations were compared to the results of a behavioral ideal model of the system built in MATLAB. As expected, the signal-to-noise ratio (SNR) was improved in concordance with the increase in the number of phases. Finally, it was checked that the proposed circuit used to extract and inject the interpolated phases did not penalize the total power consumption. The proposed circuit structure is particularly suitable for high-bandwidth applications, where the oversampling ratio (OSR) is strongly restricted and the gain is limited because of the oscillator non-linearity. Due to the highly digital nature of the VCO-based ADC structures, this solution may be of special interest to be implemented in new deep-submicron CMOS processes.
dc.description.sponsorship This work was supported by the CICYT project TEC2017-82653-R, Spain.
dc.format.extent 5
dc.language.iso eng
dc.publisher IEEE
dc.rights © 2019, IEEE.
dc.subject.other Analogue-digital conversion
dc.subject.other CMOS integrated circuits
dc.subject.other Interpolation
dc.subject.other Voltage-controlled oscillators
dc.title Resolution Enhancement of VCO-based ADCs by Passive Interpolation and Phase Injection
dc.type bookPart
dc.type conferenceObject
dc.description.status Publicado
dc.subject.eciencia Electrónica
dc.identifier.doi https://doi.org/10.1109/DCIS201949030.2019.8959933
dc.rights.accessRights openAccess
dc.relation.projectID Gobierno de España. TEC2017-82653-R
dc.type.version acceptedVersion
dc.relation.eventdate 20-22 noviembre 2019
dc.relation.eventnumber 34
dc.relation.eventplace Bilbao, España
dc.relation.eventtitle XXXIV Conference on Design of Circuits and Integrated Systems (DCIS 2019)
dc.relation.eventtype proceeding
dc.identifier.publicationfirstpage 1
dc.identifier.publicationlastpage 5
dc.identifier.publicationtitle 2019 XXXIV Conference on Design of Circuits and Integrated Systems (DCIS). Proceedings
dc.identifier.uxxi CC/0000030326
dc.contributor.funder Comisión Interministerial de Ciencia y Tecnología (España)
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