Title :
Design of automatic frequency calibration Used in the PLL frequency synthesizer for 2.4GHz WSN
Author :
Fan Xiangning ; Tang Haihong ; Yu Lu ; Li Bin
Author_Institution :
Sch. of Inf. Sci. & Eng., Southeast Univ., Nanjing, China
Abstract :
In this paper, an open looped fast automatic frequency calibration (AFC) unit used in 2.4GHz CMOS integer-N phase-locked loop (PLL) frequency synthesizer (FS) for IEEE802.15.4/ZigBee wireless sensor networks (WSN) is presented. The calibration method accomplishes efficient search for an optimum discrete tuning curve of the voltage controlled oscillator (VCO) among a group of frequency sub-bands. The pre-simulation, layout design and post-simulation results are given. Post simulation results show that the AFC performs well.
Keywords :
CMOS integrated circuits; UHF integrated circuits; UHF oscillators; Zigbee; calibration; frequency synthesizers; phase locked loops; voltage-controlled oscillators; wireless sensor networks; AFC unit; CMOS integer-N phase-locked loop frequency synthesizer; IEEE802.15.4; PLL frequency synthesizer; VCO; WSN; ZigBee wireless sensor networks; automatic frequency calibration method; frequency 2.4 GHz; frequency subbands; layout design; open looped fast automatic frequency calibration unit; optimum discrete tuning curve; voltage controlled oscillator; Calibration; Frequency synthesizers; Phase locked loops; Tuning; Voltage-controlled oscillators; Wireless sensor networks; CMOS; automatic frequency calibration; frequency synthesizer; wireless sensor networks;
Conference_Titel :
Microwave Workshop Series on Millimeter Wave Wireless Technology and Applications (IMWS), 2012 IEEE MTT-S International
Conference_Location :
Nanjing
Print_ISBN :
978-1-4673-0901-1
Electronic_ISBN :
978-1-4673-0903-5
DOI :
10.1109/IMWS2.2012.6338182
