Title :
Maximizing the oscillation frequency of CMOS VCOs
Author :
Chen, Huiting ; Geiger, Randall
Author_Institution :
Dept. of Electr. & Comput. Eng., Iowa State Univ., Ames, IA, USA
Abstract :
Techniques for enhancing the operation frequency range for voltage controlled ring oscillators are discussed. It is shown that substantial improvement in speed is achievable with concentric layout techniques and with transconductance density optimization. Simulation results for a VCO designed in a 0.35 μm CMOS process are presented which show a center frequency of 4.5 GHz and a tuning range of ±12%
Keywords :
CMOS analogue integrated circuits; MMIC oscillators; circuit optimisation; circuit tuning; field effect MMIC; integrated circuit layout; voltage-controlled oscillators; 0.35 micron; 4.5 GHz; CMOS process; VCO design; concentric layout techniques; diffusion parasitics minimisation; operation frequency range enhancement; oscillation frequency maximisation; transconductance density optimization; voltage controlled ring oscillators; CMOS process; Capacitance; Circuits; Delay; Frequency; Poles and zeros; Ring oscillators; Transconductance; Voltage control; Voltage-controlled oscillators;
Conference_Titel :
Circuits and Systems, 2000. Proceedings of the 43rd IEEE Midwest Symposium on
Conference_Location :
Lansing, MI
Print_ISBN :
0-7803-6475-9
DOI :
10.1109/MWSCAS.2000.951441
