Theoretical and experimental investigations on the high effective subharmonic injection locking of IMPATT oscillators in millimeter wave region
Abstract
Two new highly effective subharmonic injection locking methods to stabilize the IMPATT oscillator are proposed. One of the methods applies a parasitic oscillating signal attendant to the main oscillating signal, while the other utilizes an idler signal which is several times higher than the injection signal frequency. Kurokawa's (1973) oscillator analysis is extended to derive a generalized external injection locking theory for analyzing various subharmonic injection locking oscillators with multiple-resonant circuits, which resonate at very different frequencies. Small signal analysis for the single-frequency operated IMPATT diode is extended to more generalized multiple frequencies and current analysis in order to derive interrelationships between frequencies and circuit currents used for estimating circuit parameters. The results are used to numerically calculate the locking characteristics of IMPATT oscillators. The use of these methods to obtain wide locking bandwidth and high locking gain is demonstrated.
- Publication:
-
Radio Research Laboratory, Journal
- Pub Date:
- November 1983
- Bibcode:
- 1983RaRLJ..30...89H
- Keywords:
-
- Avalanche Diodes;
- Injection Locking;
- Microwave Oscillators;
- Millimeter Waves;
- Phase Locked Systems;
- Bandwidth;
- Equivalent Circuits;
- Power Gain;
- Electronics and Electrical Engineering