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dc.contributor.authorZou, Qiongen
dc.identifier.citationZou, Q. (2015). Design of voltage-controlled oscillators and frequency dividers for 60 GHZ wireless communication applications. Doctoral thesis, Nanyang Technological University, Singapore.en
dc.description.abstractA frequency synthesizer which is used to provide the local oscillation (LO) frequency of a transceiver is a fundamental block in a wireless communication system. For 60 GHz applications, the voltage-controlled oscillator (VCO) and the first-stage frequency divider (FD) are the most challenging blocks of a synthesizer due to their high operation frequency and their significant influence on the overall performance of the synthesizer. As frequency increases, the trade-offs between phase noise, power consumption, and tuning range of VCO becomes more difficult. In this thesis, firstly, the Q enhancement of multiple-coupled LC-tank has been investigated, mainly for the purpose of designing VCOs with low phase noise under low power consumption for 60 GHz transceivers with a multi-conversion super-heterodyne architecture. Secondly, a Ku-band VCO using dual LC-tanks and transformer-based feedback technique is designed. Thirdly, to cater for the requirement of wide tuning range for 60 GHz applications, a new dual-mode VCO topology with switchable coupled VCO-cores has been proposed to design low phase noise and wide frequency tuning range 60 GHz VCOs. For the first-stage FD, the injection-locked frequency divider (ILFD) with high division ratio is an attractive solution for mm-wave frequency synthesizers, but normally ILFDs suffer from narrow locking ranges, making them difficult to design for 60 GHz applications. In the thesis, a V-band divide-by-4 ILFD has been proposed. With the special topology involving dual oscillation loops, a wide locking range has been achieved at 60 GHz.en
dc.format.extent154 p.en
dc.subjectDRNTU::Engineering::Electrical and electronic engineering::Electronic circuitsen
dc.titleDesign of voltage-controlled oscillators and frequency dividers for 60 GHZ wireless communication applicationsen
dc.contributor.supervisorYeo Kiat Sengen
dc.contributor.schoolSchool of Electrical and Electronic Engineeringen
dc.description.degreeDOCTOR OF PHILOSOPHY (EEE)en
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