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Enhanced Prediction Capabilities of Harmonic and Intermodulation Distortion Characteristics of μ-Wave and mm-Wave PHEMTs Via an Advanced Non-Linear Model

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3 Author(s)
Cojocaru, Vicentiu I. ; Department of Electrnic and Electrical Engineering, University College Dublin, Dublin 4, Ireland. E-mail: vivi@hertz.ucd.ie ; Bannon, A. ; Brazil, T.J.

The paper investigates the capabilities of the COBRA FET model [1] to predict the harmonic and intermodulation distortion (IMD) characteristics of μ-wave and mm-wave PHEMT devces. The ability of the model to account for high order effects is proven by analysing the second and third order derivatives of the drain 1/V model and the gate Q/V model. A substantial and conclusive selection of results of single-tone large-signal tests (with harmonics reaching into the mm-wave region) and two-tone large-signal test (including third and fifth intermodulation products) are presented for the case of a 0.2μm PHEMT process designed for mm-wave applications. The simulations have been carried out with the HP-EEsof SeriesIV simulator, where the model has been recently implemented (in compiled form). These results show a very good overall agreement between simulated and measured harmonic and IM distortion characteristics, from μ-wave up to mm-wave frequencies and across the entire bias region.

Published in:

Microwave Conference, 1998. 28th European  (Volume:1 )

Date of Conference:

4-6 Oct. 1998

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