A high-performance CMOS multiphase voltage-controlled oscillator for communication systems

• Published in: 2002 IEEE International Symposium on Circuits and Systems (ISCAS) Vol. 4; p. IV
• Main Authors: Sheen, R.R.-B., Chen, O.T.-C., Zheng-Dao Lee
• Format: Conference Proceeding
• Language: English
• Published: IEEE 2002
• Subjects: CMOS technology; Filters; Modems; Phase noise; Power dissipation; Power generation; Radio frequency; Signal generators; Transceivers; Voltage-controlled oscillators
• ISBN: 9780780374485; 0780374487
• DOI: 10.1109/ISCAS.2002.1010476

A multiphase oscillator employing phase-setting and oscillation-generation units was developed for modern communication systems. The phase-setting unit includes multiple cascading phase-shifting cells the number of which determines output signal phase differences. The oscillation-generation unit consists of multiple oscillators to trigger the phase-setting unit. This configuration ensures that the proposed multiphase oscillator has good oscillation quality and high phase accuracy. In addition, a voltage-controlled ring oscillator capable of generating two oscillation signals with a phase difference of 180/spl deg/ is designed. It not only decreases the settling time of the multiphase oscillation system, but also reduces power dissipation due to its simplicity. By using TSMC 1P6M 0.18 /spl mu/m CMOS technology, the proposed multiphase voltage-controlled oscillator (VCO) yields oscillation signals ranging from 2.37 GHz to 2.53 GHz at a supply voltage of 1.8 V. There are 8 oscillation signals with phase differences of 45/spl deg/, 90/spl deg/, 135/spl deg/, 180/spl deg/, 225/spl deg/, 270/spl deg/, 315/spl deg/ and 360/spl deg/. Power dissipation is around 4.21 mW to 4.88 mW.