Properties of S-Band TRAPATT Diode Oscillators.
MICHIGAN UNIV ANN ARBOR ELECTRON PHYSICS LAB
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The purpose of this investigation is to study theoretically and experimentally the operation of TRAPATT mode an acronym for trapped plasma avalanche triggered transit oscillators. The solid-state device and microwave circuit as well as the interaction between them are considered in detail. A simplified computer model of a TRAPATT oscillator that considers the operation of the device from the terminal voltage-current waveforms has been developed. This model allows the investigation of arbitrary current waveforms and therefore can be used in the study of harmonic tuning effects and the requirements for high-efficiency operation. The simplified computer model is used to study the operation of the oscillator with many different terminal voltage-current waveforms. Waveforms containing up to ten harmonic frequencies are considered. By individually varying the amplitude and phase angles of each harmonic component the optimum tuning conditions for high-efficiency operation are obtained. It has been determined that the oscillator efficiency is primarily dependent upon the amplitude and phase angle of the fundamental signal and the phase angle of the second-harmonic component. The amplitude of the second harmonic and the amplitudes and phase angles of the third and higher harmonic components have a significant effect on oscillator frequency but only a minor effect on oscillator efficiency. It has also been determined, theoretically at least, that steady-state TRAPATT oscillations are possible with single-frequency operation. Author
- Electrical and Electronic Equipment