Design Of Low Phase Noise Very High Frequency (VHF) Low Band Voltage Controlled Oscillator (VCO) For Transceiver Application

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dc.contributor.authorYeap, Kim Huat
dc.date.accessioned2018-12-17T07:21:55Z
dc.date.available2018-12-17T07:21:55Z
dc.date.issued2011-09
dc.description.abstractThere is little research in transceiver technology for Very High Frequency (VHF) low band nowadays because many communication systems today use higher frequency bands. However, low band is still required in specific fields, such as public safety due to its extensive and precise coverage. This thesis researches improvement in the phase noise of the low band Voltage Controlled Oscillator (VCO). As such, the back-to-back varactor, the linearizing inductor, and the low noise biasing network are introduced. Sensible placement of the bypass capacitor, choke, and ferrite bead as well as proper selection of parts have been studied and implemented. The transmitter VCO design comprises of an oscillator cascaded with a buffer and a pad attenuator to improve the output matching. The receiver VCO has a similar design but added with a filter at the output to suppress its harmonics before injected into the mixer. Momentum co-simulation is introduced and proven as a closer correlated simulation method compared to conventional simulations. The receiver VCO measured phase noise is around -126 dBc/Hz at 12.5 kHz offset and around -136 dBc/Hz at 25 kHz offset. The transmitter VCO measured phase noise is around -134 dBc/Hz at 12.5 kHz offset and around -141 dBc/Hz at 25 kHz offset. Both VCOs phase noise comply with the specifications of < -118 dBc/Hz at 12.5 kHz offset and < -133 dBc/Hz at 25 kHz offset. Such VCO is suitable in both domestic and public safety applications.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/7314
dc.language.isoenen_US
dc.publisherUniversiti Sains Malaysiaen_US
dc.subjectDesign of low phase noise very high frequencyen_US
dc.subjectlow band voltage controlled oscillatoren_US
dc.titleDesign Of Low Phase Noise Very High Frequency (VHF) Low Band Voltage Controlled Oscillator (VCO) For Transceiver Applicationen_US
dc.typeThesisen_US
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