Young Uk Yim John F. McDonald Russell P. Kraft 12-23 GHz Ultra Wide Tuning Range Voltage-Controlled Ring Oscillator with Hybrid Control Schemes. 278-279 2005 conf/isvlsi/2005 ISVLSI http://doi.ieeecomputersociety.org/10.1109/ISVLSI.2005.1 db/conf/isvlsi/isvlsi2005.html#YimMK05