TRAPATT Diode Amplifiers.
MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
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A description has been given of the device simulation computer program which is the basis of the theoretical results obtained. Different methods for obtaining solutions using this program with current drive and voltage drive have been discussed, and a particular current drive yielding negative resistance at least up to the third harmonic has been presented. It was demonstrated that a one cycle simulation is sufficient to characterize the diode impedance, thus avoiding the time and expense of obtaining converged solutions. From a series of diode simulations at different frequencies, the required impedance vs. frequency characteristics for a broadband amplifier was presented. An optimization procedure was discussed whereby the parameters of a stepped coaxial line are adjusted so that the input impedance approximates the required theoretical impedance as closely as possible. The fabrication of the resulting circuit was outlined. Impedance vs. frequency measurements of the fabricated circuit were presented and reasons given for discrepancies between the measured circuit impedances and the expected impedance based on the original circuit model. Finally, experimental results for an amplifier circuit were given as well as suggestions for future measurements and circuit fabrication modifications. Author
- Electrical and Electronic Equipment
- Solid State Physics