Development of C-band Fractional Frequency Synthesizer

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Dr. Seller Rudolf
Department of Broadband Infocommunications and Electromagnetic Theory

Modern high frequency electronic devices (e.g. mobile phones, televisions, GPS, RADAR etc.) use microwave signals. To utilize the advantages of microwave signals we need to produce the microwave signal itself. The most common way of producing these signals, is frequency synthesizing. In my thesis I will present alternative methods of synthesizing in different levels of detail.

My main task is to develop a fractional PLL (Phase Locked Loop) which has to operate between 3.08GHz and 4.91GHz with 1kHz frequency resolution.

This thesis mainly focusing on giving a proper introduction of the LTC6948-2 integrated circuit, developed by Linear Technology, detailing the radio frequency spurious signals that are specific in synthesizer applications. Further more, I would like to reflect on solutions of filtering and attenuating these unwanted spectral components, output signal power and adaptability in high-end technology signal sources, RADARs and other RF equipments.

This thesis also includes the basic knowledge of frequency synthesizing, the development of the whole synthesizer system including the PCB, the simulations and the measurement of phase noise and other spurious signals.


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