CMOS techniques for direct digitisation of current signals

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dc.check.date2030-06-12
dc.contributor.advisorO'Hare, Daniel
dc.contributor.advisorCantillon-Murphy, Padraig
dc.contributor.authorWall, Anthonyen
dc.contributor.funderInfineon Technologies
dc.date.accessioned2025-05-13T11:04:58Z
dc.date.available2025-05-13T11:04:58Z
dc.date.issued2024
dc.date.submitted2024
dc.description.abstractThis thesis presents a series of techniques and circuits to further the art of CMOS current-to-digital conversion using digitally-assisted techniques, particularly suited to highly-scaled technology nodes. A new model of the Current-Controlled Ring Oscillator (CCRO) is presented which describes its non-linearity with a single parameter, the Active-to-Dead Time Ratio (TADR). An improved squaring CCRO topology is presented, based on the TADR model which improves upon the linearity of inverter-based CCROs by 9.75 dB. The power-linearity trade-off is greatly improved by the introduction of the Ping-Pong CCO (PP-CCO), a new Current Controlled Oscillator (CCO) architecture. It demonstrates power consumption 19× lower than the improved squaring CCRO, and 2.75× lower than the state of the art. Based on the TADR model, a novel time-based, digitally-assisted linearity correction method is designed. This method uses a Time Quantiser (TQ) to quantise the period of the CCO, and its dead time is simply subtracted in the digital domain. The TQ is designed using a novel injection-locked Cyclic-Coupled Ring Oscillator (Cyc-CRO), which enables the oscillator’s use in TQs. Using the PP-CCO and the time-based linearity correction backend, the second harmonic, usually dominant in single-ended CCRO architectures, drops below the noise floor and >25 dB of correction is seen without the need for calibration or lookup tables.en
dc.description.statusNot peer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationWall, A. 2024. CMOS techniques for direct digitisation of current signals. PhD Thesis, University College Cork.
dc.identifier.endpage382
dc.identifier.urihttps://hdl.handle.net/10468/17472
dc.language.isoenen
dc.publisherUniversity College Corken
dc.rights© 2024, Anthony Wall.
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectAnalogue to digital converter
dc.subjectADC
dc.subjectCurrent controlled ring oscillator
dc.subjectCCRO
dc.subjectTime domain ADC
dc.subjectCurrent to digital converter
dc.subjectCDC
dc.subjectTime quantiser
dc.subjectTQ
dc.subjectDigitally assisted
dc.subjectLinearity correction
dc.titleCMOS techniques for direct digitisation of current signals
dc.typeDoctoral thesisen
dc.type.qualificationlevelDoctoralen
dc.type.qualificationnamePhD - Doctor of Philosophyen
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