Maximizing the Oscillation Frequency of Cmos Vcos
نویسندگان
چکیده
* This work was supported, in part, by Texas Instruments Inc., Rocketchips Inc., and the R. J. Carver trust. 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 0.35μm CMOS process are presented which show a center frequency of 4.5 GHz and a tuning range of ±12%.
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