NDLI: Series impedance of GaAs planar Schottky diodes operated to 500 GHz

Content Provider	IEEE Xplore Digital Library
Author	Bhaumik, K. Gelmont, B. Mattauch, R.J. Shur, M.
Copyright Year	1963
Abstract	The author discusses the impact of ohmic contacts on the series impedance of a GaAs cylindrical planar Schottky diode. The expression for the high-frequency impedance of an annular ohmic contact is developed using a novel transmission line model. This formulation is used to ascertain the contribution of the ohmic contact impedance to the overall device series impedance at both DC and 500 GHz. Diode impedance characterization indicates that the ohmic contact impedance makes a small contribution to the series impedance in comparison to that of the other components, both at DC and submillimeter wavelengths. Hence, the dimensions of the contact pads can be scaled down significantly without any appreciable increase in series impedance but with a decrease in the parasitic pad-to-pad capacitance. Finally, this modeling establishes theoretical guidelines regarding the allowable limits for specific contact resistance in small geometry diodes, so that the device I-V characteristics are not significantly altered as a result of the ohmic contact impedance.<>
Sponsorship	IEEE Microwave Theory and Techniques Society
Starting Page	880
Ending Page	885
Page Count	6
File Size	582001
File Format	PDF
ISSN	00189480
Volume Number	40
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1992-05-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Impedance Gallium arsenide Schottky diodes Ohmic contacts Planar transmission lines Transmission line theory Parasitic capacitance Solid modeling Guidelines Contact resistance
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering Radiation

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