Show simple item record

dc.contributor.advisorBelostotski, Leonid
dc.contributor.authorTaghavi, Mohammad Hossein
dc.date.accessioned2015-06-19T19:15:56Z
dc.date.available2015-11-20T08:00:31Z
dc.date.issued2015-06-19
dc.date.submitted2015en
dc.identifier.citationTaghavi, M. H. (2015). A CMOS Optical Receiver for the Square Kilometer Array Radio Telescope (Unpublished doctoral thesis). University of Calgary, Calgary, AB. doi:10.11575/PRISM/24661en_US
dc.identifier.urihttp://hdl.handle.net/11023/2311
dc.description.abstractThe Square Kilometer Array (SKA) is an international effort to construct the world 's largest radio telescope with an effective area of one square kilometer. By their nature signals arriving from astronomical sources are very weak. An SKA receiver therefore will require a wideband high-frequency gain in the order of 70 dB to condition the signals for data processing. This large wideband gain makes the conventional data transfer through coaxial cables problematic as any amount of signal leaking back into the receiver front-end can either overpower the desired signals and desensitize the receiver and/or cause stability issues. Therefore, optical data transfer is desirable and is being considered in this thesis. This thesis presents a study of using CMOS technologies, which are attractive due to their lower costs, higher integration densities, and lower power consumption, to implement an optical transfer for an SKA receiver. Four different transimpedance amplifiers (TIAs) were designed and experimentally verified in this work. One of these TIAs that employs an immittance converter, which provides both a negative input resistance to increase the input pole frequency and a negative inductance to improve the circuit stability, was chosen as an optical receiver front end. The proposed TIA achieves a 6 GHz 3-dB bandwidth with a 250 fF photodiode capacitance. The transimpedance gain of a single-stage TIA is 54 dBohm, the group-delay variation and average input-referred noise current are 6 ps and 24 pA/sqrt(Hz), respectively, over its entire bandwidth. A fully integrated CMOS optical receiver front end was proposed and experimentally verified in this work. The receiver achieves a transimpedance gain of 77.7 dBohm with a 12-GHz 3-dB bandwidth. With a photodiode, whose responsivity is 0.8 A/W, the simulated sensitivity of the optical receiver at 15 Gb/s is about -12 dBm for a bit error rate (BER) of less than 10^{-12}. A time-to-digital (TDC) converter that utilizes an optimum detection concept was designed and fabricated in a TSMC 65nm CMOS process as an optical receiver back end.en_US
dc.language.isoeng
dc.rightsUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.
dc.subjectEngineering--Electronics and Electrical
dc.subject.classificationOptical receiver, Transimpedance amplifier, Limiting amplifier, equalizer, time-based ADC, Square Kilometre Array, CMOSen_US
dc.titleA CMOS Optical Receiver for the Square Kilometer Array Radio Telescope
dc.typedoctoral thesis
dc.publisher.facultyGraduate Studies
dc.publisher.institutionUniversity of Calgaryen
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/24661
thesis.degree.nameDoctor of Philosophy
thesis.degree.namePhD
thesis.degree.disciplineElectrical and Computer Engineering
thesis.degree.grantorUniversity of Calgary
atmire.migration.oldid3322
dc.publisher.placeCalgaryen


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record