Title :
Analysis and Design of a Wide-Tuning-Range VCO With Quadrature Outputs
Author :
Lee, Shuenn-Yuh ; Chen, Ching-Yi
Author_Institution :
Dept. of Electr. Eng., Nat. Chung-Cheng Univ., Chiayi
Abstract :
A quadrature voltage-controlled oscillator (QVCO) with a wide tuning range is proposed and implemented in the TSMC 0.18- mum CMOS process. The said QVCO uses a cross-coupled structure and a current-reuse technology to produce the quadrature signal and to save power consumption and area, respectively. Based on our measurement, the phase noise with 1-MHz offset from the carrier frequency of 3.6 GHz is - 114 dBc/Hz and the proposed QVCO has a wide-band tuning range of 3.6-4.9 GHz. Also, the maximal phase error and power imbalance are less than 5deg and 1.5 dB, respectively, and the power consumption is 8 mW at 2-V power supply voltage.
Keywords :
CMOS integrated circuits; tuning; voltage-controlled oscillators; TSMC CMOS process; cross-coupled structure; current-reuse technology; frequency 3.6 GHz to 4.9 GHz; quadrature outputs; quadrature signal; size 0.18 mum; voltage-controlled oscillator; wide-band tuning; wide-tuning-range VCO; CMOS process; CMOS technology; Energy consumption; Frequency measurement; Noise measurement; Phase measurement; Phase noise; Tuning; Voltage-controlled oscillators; Wideband; Quadrature; voltage-controlled oscillator; wide-tuning-range;
Journal_Title :
Circuits and Systems II: Express Briefs, IEEE Transactions on
DOI :
10.1109/TCSII.2008.2008054
