Wide-Band Phase Locking and Phase Shifting Using Feedback Control of Oscillators (Short Papers)

Two Yig-tuned Gunn oscillators/sup 1/ have been frequency locked over a 3-GHz range in X-band. Injected power into the locked oscillator was approximately 10 dB below its output power. Analog frequency-tracking circuitry was used together with phase-comparator feedback to achieve output phase which remained within /spl plus mn/10/spl deg/ over a 1.2 GHz bandwidth. Controlled phase shifting was obtained by applying dc voltages within the feedback loop.