Title :
The Study of a Dual-Mode Ring Oscillator
Author :
Chen, Zuow-Zun ; Lee, Tai-Cheng
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan
fDate :
4/1/2011 12:00:00 AM
Abstract :
An analytical investigation of a dual-mode ring oscillator is presented. The ring oscillator is designed using a CMOS 0.18-μm technology with differential eight-stage delay cells employing auxiliary input devices. With a proper startup control, the oscillator operates in two different modes covering two different frequency bands. A nonlinear model, along with the linearization method, is used to obtain the transient and steady-state behaviors of the dual-mode ring oscillator. The analytical derivations are verified through HSPICE simulation. The oscillator operates at the frequency bands from 2-5 GHz and from 0.1-2 GHz, respectively.
Keywords :
CMOS integrated circuits; oscillators; CMOS technology; HSPICE simulation; auxiliary input device; differential eight-stage delay cells; dual-mode ring oscillator; frequency 0.1 GHz to 2 GHz; frequency 2 GHz to 5 GHz; linearization method; nonlinear model; size 0.18 micron; steady-state behavior; transient behavior; CMOS integrated circuits; Delay; Equations; Mathematical model; Ring oscillators; Steady-state; Fractional-$N$ frequency synthesizer (FNFS); multiphase signals; ring oscillators; voltage-control oscillators (VCOs);
Journal_Title :
Circuits and Systems II: Express Briefs, IEEE Transactions on
DOI :
10.1109/TCSII.2011.2124650
