Title :
A Fast-Locking Agile Frequency Synthesizer for MIMO Dual-mode WiFi / WiMAX Applications
Author :
Tsai, Meng-Ting ; Yang, Ching-Yuan
Author_Institution :
Ind. Technol. Res. Inst. Hsinchu, Hsinchu
Abstract :
In this paper, a frequency synthesizer based on phase-locked loop (PLL) technique for dual-mode WiFi (2.4-GHz band) and WiMax (5-GHz band) applications is presented. The frequency synthesizer with wide frequency range application and the settling time within 10-mus is realized by a time-to-voltage converter (TVC). A 40-MHz input reference for 125-KHz frequency steps which is realized by a 12-bits MASH 1-1 delta-sigma modulator for fractional divisions. The frequency synthesizer provides output frequency ranges from 4.6-GHz to 5.4-GHz with simulated phase noise of around -110 dBc/Hz at 1-MHz offset. Simulated in standard 0.13-mum CMOS process, the frequency synthesizer dissipates 40-mW from a 1.2-V power supply.
Keywords :
MIMO communication; delta-sigma modulation; frequency synthesizers; phase locked loops; wireless LAN; MIMO system; delta-sigma modulator; dual-mode WiFi/WiMAX application; fast-locking agile frequency synthesizer; multiple input multiple output; phase-locked loop; time-to-voltage converter; wide frequency range application; wireless fidelity; CMOS process; Delta modulation; Frequency conversion; Frequency synthesizers; MIMO; Multi-stage noise shaping; Phase locked loops; Phase noise; Power supplies; WiMAX;
Conference_Titel :
Electronics, Circuits and Systems, 2007. ICECS 2007. 14th IEEE International Conference on
Conference_Location :
Marrakech
Print_ISBN :
978-1-4244-1377-5
Electronic_ISBN :
978-1-4244-1378-2
DOI :
10.1109/ICECS.2007.4511257
