International Journal of Emerging Technology and Advanced Engineering (IJETAE)
Frequency synthesizer's behavior affects the wireless communication system. The quality of the frequency synthesizer is highly dependent on the type of Phase Locked-Loop (PLL) used for the system. It is crucial for the designers determine the correct type of PLL to achieve high noise performance, high switching speed, and high resolution in the wireless communication system. In this paper, several PLL-based frequency synthesizers are reviewed, including the design options and associated trade-offs. Design requirements in terms of phase noise, settling time, frequency resolution and frequency of operation are presented.