Impact of Eddy Currents and Crowding Effects on High-Frequency Losses in Planar Schottky Diodes

In this paper, we present the influence of eddy currents, skin and proximity effects on high-frequency losses in planar terahertz Schottky diodes. The high-frequency losses, particularly losses due to the spreading resistance, are analyzed as a function of the ohmic-contact mesa geometry for frequen...

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Bibliographic Details
Published in:IEEE transactions on electron devices 2011-10, Vol.58 (10), p.3260-3269
Main Authors: Aik Yean Tang, Stake, J.
Format: Article
Language:English
Subjects:
Applied sciences
Atmospheric modeling
Circuit properties
Couplings
Current distribution
Diodes
eddy current
Eddy current testing
Electric, optical and optoelectronic circuits
electromagnetic coupling
Electronics
Equivalent circuits
Exact sciences and technology
geometric modeling
Geometry
Integrated circuit modeling
Interfaces
Mesas
Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits
parameter extraction
proximity effect
Proximity effect (electricity)
Resistance
Schottky diodes
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Simulation
skin effect
Spreading
Studies
submillimeter wave devices
submillimeter wave integrated circuits
Three dimensional
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Summary:In this paper, we present the influence of eddy currents, skin and proximity effects on high-frequency losses in planar terahertz Schottky diodes. The high-frequency losses, particularly losses due to the spreading resistance, are analyzed as a function of the ohmic-contact mesa geometry for frequencies up to 600 GHz. A combination of 3-D electromagnetic (EM) simulations and parameter extraction based on lumped equivalent circuit is used for the analysis. The extracted low-frequency spreading resistance shows a good agreement with the results from electrostatic simulations and experimental data. By taking into consideration the EM field couplings, the analysis shows that the optimum ohmic-contact mesa thickness is approximately one-skin depth at the operating frequency. It is also shown that, for a typical diode, the onset of eddy current loss starts at ~ 200 GHz, and the onset of a mixture of skin and proximity effects occurs around ~ 400 GHz.
ISSN:0018-9383
1557-9646
1557-9646
DOI:10.1109/TED.2011.2160724