Feedback in Very-High-Frequency and Ultra-High-Frequency Oscillators

This paper covers a study of feedback considerations in low-power negative-gnrd triode oscillators for the frequency range of 100 to 1,000 Mc. Discussion is mainly confined to oscillators using a single tuned circuit between grid and plate in the modified Colpitts circuit wherein the feedback is provided by the internal tube capacitances. The optimum feedback conditions are derived, and the analysis is applied to several typical oscillators.