Title :
A 5-GHz frequency synthesizer with AFC for low IF ZigBee transceiver applications
Author :
Li, Zhiqun ; Jiang, Yawei ; Shu, Haiyong ; Hou, Ningbing
Author_Institution :
Inst. of RF- & OE-ICs, Southeast Univ., Nanjing, China
Abstract :
A fully integrated integer-N frequency synthesizer has been designed and implemented in 0.18μm RF CMOS technology for low intermediate frequency (IF) ZigBee transceiver application. It incorporates an automatic frequency calibration (AFC) loop to extend frequency tuning range. In-phase and quadrature (IQ) signals are generated by a divide-by-two frequency divider at the output of PLL. It consumes 11mA at 1.8V. The measured phase noise is -118dBc/Hz and -135dBc/Hz at the offset of 1MHz and 3MHz from 2.405GHz carrier respectively. The measured reference-spur at 2MHz offset from 2.405GHz carrier is -64dBc.
Keywords :
CMOS integrated circuits; Zigbee; calibration; frequency synthesizers; phase locked loops; phase noise; radio transceivers; AFC; IQ signal; PLL; RF CMOS technology; automatic frequency calibration; current 11 mA; frequency 5 GHz; frequency synthesizer; frequency tuning range; low IF ZigBee transceiver application; phase noise; size 0.18 mum; voltage 1.8 V; Frequency control; Frequency conversion; Frequency synthesizers; Phase locked loops; Phase noise; Radiation detectors; Voltage-controlled oscillators; Automatic frequency calibration; Phase-locked loop; Voltage controlled oscillator; ZigBee; phase noise;
Conference_Titel :
New Circuits and Systems Conference (NEWCAS), 2011 IEEE 9th International
Conference_Location :
Bordeaux
Print_ISBN :
978-1-61284-135-9
DOI :
10.1109/NEWCAS.2011.5981336
