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Gate bias voltage dependence of Cardiff admittance model in Ka-band GaAs pHEMTs

Baddeley, Alexander, Azad, Ehsan, Quaglia, Roberto, Bell, James and Tasker, Paul 2022. Gate bias voltage dependence of Cardiff admittance model in Ka-band GaAs pHEMTs. Presented at: IEEE Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless Applications (PAWR), Las Vegas, NV, USA, 16-19 January 2022. 2022 IEEE Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless Applications (PAWR). IEEE, pp. 8-10. 10.1109/PAWR53092.2022.9719858

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Abstract

This paper analyzes the dependence vs. gate bias voltage of the coefficients of the Cardiff model in the admittance form. The load-pull measurement data used to extract the model, inclusive of input power sweep, is taken on a GaAs pseudomorphic high electron mobility transistor (pHEMT) at the frequency of 36 G Hz. The gate bias is swept in class C and in class AB and a different set of coefficients is extracted at each bias point. It is observed that the model coefficients can be fitted vs. bias using a linear function within the class C and class AB ranges. This allows to predict the model coefficients within a range of bias voltages with load-pull measurements at only a few bias points, significantly reducing the measurement effort. Using the predicted coefficients, the model shows a global error lower than -31 dB for the DC and fundamental output current.

Item Type: Conference or Workshop Item (Paper)
Date Type: Published Online
Status: Published
Schools: Engineering
Publisher: IEEE
ISBN: 978-1-6654-3472-0
Funders: EPSRC, Qorvo inc.
Date of First Compliant Deposit: 15 March 2022
Date of Acceptance: 17 September 2021
Last Modified: 30 Apr 2022 16:10
URI: https://orca.cardiff.ac.uk/id/eprint/148386

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