Abstract
A 40 GHz modified-Colpitts voltage controlled oscillator (VCO) is presented that offers wider tuning range than the basic Colpitts structure with comparable phase noise performance. The modification entails the addition of a negative-resistance to compensate for the low-Q of the microstrip lines used as the inductive element. Simulations show a 15% increase in tuning range for the modified Colpitts VCO, a significant improvement over that of the basic structure.
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