Title :
A coupled two-stage ring oscillator
Author :
Rezayee, A. ; Martin, Ken
Author_Institution :
Dept. of Electr. & Comput. Eng., Toronto Univ., Ont.
Abstract :
Modeling, analysis and test results of a fabricated coupled two-stage ring oscillator are presented in this paper. The oscillator consists of two two-stage ring oscillators which are coupled to each other and oscillate with the same frequency, but with 45 degrees phase difference resulting in two sets of quadrature outputs. It has been proven analytically that the coupled ring oscillator has an inherent capability of oscillating with frequencies as high as 1.96 times that of a single three-stage ring. A coupled two-stage ring oscillator, fabricated in CMOS 0.18 μm technology, is described. This VCO has frequency tuning range of 2.5 - 9 GHz for a 1.8 V power supply voltage
Keywords :
CMOS analogue integrated circuits; circuit tuning; coupled circuits; voltage-controlled oscillators; 0.18 micron; 1.8 V; 2.5 to 9 GHz; CMOS technology; VCO; coupled two-stage ring oscillator; frequency tuning; phase difference; quadrature output; CMOS technology; Coupled mode analysis; Coupling circuits; Eigenvalues and eigenfunctions; Feedback; Frequency; Inverters; Ring oscillators; Strontium; Testing;
Conference_Titel :
Circuits and Systems, 2001. MWSCAS 2001. Proceedings of the 44th IEEE 2001 Midwest Symposium on
Conference_Location :
Dayton, OH
Print_ISBN :
0-7803-7150-X
DOI :
10.1109/MWSCAS.2001.986327
