Title :
A frequency synthesizer realized by a transformer-based voltage-controlled oscillator for IEEE 802.11a/b/g channels
Author :
Tsai, Meng-Ting ; Yang, Ching-Yuan
Author_Institution :
Dept. of Electr. Eng., Nat. Chung Hsing Univ., Taichung
Abstract :
A fractional-N frequency synthesizer for IEEE 802.11a/b/g standard with the design focused on voltage controlled oscillator (VCO) is proposed in this paper. Unlike the traditional approach of tuning VCO oscillation frequencies by capacitive varactors, the proposed VCO with a voltage-controlled inductor, which is made by an integrated transformer technology, is adopted. A digital delta-sigma modulator realized with FPGA verification is employed for fractional-N purpose to meet IEEE 802.11a/b/g channels. The frequency synthesizer is simulated in 0.18-mum CMOS process with a loop-bandwidth of 300 KHz for a 32-MHz reference and the power dissipation is about 40 mW from a 1.8-V supply
Keywords :
delta-sigma modulation; field programmable gate arrays; frequency synthesizers; inductors; integrated circuit design; transceivers; voltage-controlled oscillators; 0.18 micron; 1.8 V; 300 kHz; 32 MHz; 40 mW; CMOS process; FPGA verification; IEEE 802.11a/b/g channels; digital delta-sigma modulator; fractional-N frequency synthesizer; integrated transformer; voltage-controlled inductor; voltage-controlled oscillator; CMOS process; CMOS technology; Delta-sigma modulation; Field programmable gate arrays; Frequency synthesizers; Inductors; Power dissipation; Tuning; Varactors; Voltage-controlled oscillators;
Conference_Titel :
Circuits and Systems, 2006. ISCAS 2006. Proceedings. 2006 IEEE International Symposium on
Conference_Location :
Island of Kos
Print_ISBN :
0-7803-9389-9
DOI :
10.1109/ISCAS.2006.1693804
