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On the Modelling of the Millimeter Wave Schottky Varactor

Authors:
Jyrki T. Louhi, A. V. Räisänen
Abstract:
Schottky varactor frequency multipliers are used to generate the local oscillator power at millimeter and submillimeter wavelengths. The aim of this study is to model the edge effects of the small-area circular anode in order to take them into account in all components of the equivalent circuit. The equivalent circuit contains a junction capacitance, a junction conductance, a series resistance and a model for electron velocity saturation. The correction factors due to the edge effect for the junction capacitance and for the series resistance are available in the literature. In this work we have modelled the electron velocity saturation by limiting the velocity of the transition front between the depleted and undepleted layer. By using this model the maximum current of the diode is given by the actual area of the transition front between depleted and undepleted layers. We have used our new model to analyse the two diode balanced doubler for 160 GHz constructed earlier by Erickson. The agreement between the theoretical results and the measurements is excellent, when the physical parameters of the epitaxial layer and the correction terms due to the edge effects are employed.
Categories:
Multipliers, Varactors
Year:
1994
Session:
6
Full-text:
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Page Number(s):
426-436