Doctor of Philosophy, The Ohio State University, 2003, Electrical Engineering

For the past years, great efforts have been made to implement a single chip transceiver for a target wireless system. More over, world-wide massivetransportations necessitate global communication methods. However, lots of different standards exist nowadays and a mobile unit for a certain standard can not be used for different standards. In order to cover various wireless systems, unless a new unified global communication standard is adopted, conventional systems need to be merged and evolve into a more complicated communication system called a "multi-standard'' transceiver. In a typical receiver architecture, incoming RF signals are multiplied by a local oscillator(LO) signal to obtain desired signals that might be either intermediate frequency(IF) signals or baseband signals. The local oscillator is practically an output signal of a frequency synthesizer. Conventional synthesizers can provide channel selection over a limited band due to limited division ratios of prescalers and voltage-controlled oscillator(VCO) operating frequency ranges. In this dissertation, a frequency synthesizer for multi-standard applications is presented. Based on a phase-locked loop, the synthesizer can provide various channel selection in order to comply with a designer's own frequency plan to cover multiple wireless standards. A fully programmable dual-modulus frequency divider is proposed with a new frequency division method to avoid division ratios that contain a decimal point. Newly developed PLL sub-blocks are presented. A new method to analyze and suppress effects of VCO pushing is introduced. Due to the difficulty in building a wide-band/multi-band LC-tank oscillator, a 900MHz band and tri-band single-ended voltage controlled oscillator(SE-VCRO) are built for the purpose of multi-band test even though they exhibit inferior phase noise performance to their LC-tank counterparts. A phase noise equation for a voltage-controlled oscillator is derived by modifying a phase noise equation (open full item for complete abstract)

Committee: Mohammed Ismail (Advisor) Subjects: