Title :
Analysis of a PLL based frequency synthesizer using switched loop bandwidth for Mobile WiMAX
Author :
Valenta, Vaclav ; Villegas, Martine ; Baudoin, Genevieve
Abstract :
This paper is focused on design aspects of a fractional-N PLL (phase locked loop) based frequency synthesizer proposed for the mobile WiMAX (worldwide interoperability for mobile access) standard. Requirements in terms of phase noise, settling time, frequency resolution and frequency of operation for WiMAX frequency synthesizer are presented. Furthermore, a high-speed CP (Charge Pump) PLL based synthesizer with a switched loop bandwidth is proposed and simulated. It has a 32 MHz reference frequency and a 50 kHz loop bandwidth with frequency raster of 125 kHz and 14 mus settling time.
Keywords :
WiMax; frequency synthesizers; mobile radio; phase locked loops; fractional-N phase locked loop; frequency 125 kHz; frequency 32 MHz; frequency 50 kHz; frequency synthesizer; high-speed charge pump; mobile WiMAX; switched loop bandwidth; time 14 mus; Bandwidth; Certification; Circuits; Downlink; Frequency conversion; Frequency synthesizers; Phase locked loops; Phase noise; RF signals; WiMAX; Fractional-N frequency synthesizers; high-speed electronics; phase locked loops; phase noise;
Conference_Titel :
Radioelektronika, 2008 18th International Conference
Conference_Location :
Prague
Print_ISBN :
978-1-4244-2087-2
Electronic_ISBN :
978-1-4244-2088-9
DOI :
10.1109/RADIOELEK.2008.4542708
