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Active harmonic load-pull system for characterising highly mismatched high power transistors

Aboush, Zaid, Lees, Jonathan, Benedikt, Johannes and Tasker, Paul J. 2005. Active harmonic load-pull system for characterising highly mismatched high power transistors. Presented at: IEEE MTT-S International Microwave Symposium Digest 2005, 2005. 10.1109/MWSYM.2005.1516920

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High-power devices (>30W) require low load impedances (<5?) for optimum power performance. In presenting the necessary fundamental and harmonic impedances, traditional passive load-pull systems are restricted by inherent system losses. Active load-pull can compensate for this problem, but unfortunately does not scale well with high power applications. This paper presents a novel solution allowing harmonic load-pull characterization of high-power devices. Broadband impedance transformers allow the necessary load-pull power to be dramatically reduced whilst maintaining the accuracy and integrity of measured waveforms. This approach has been successfully demonstrated through the measurement of a 30W LDMOS device, where the required active load-pull power required to present the optimum load has been reduced from 270W to 50W.

Item Type: Conference or Workshop Item (Paper)
Date Type: Publication
Status: Published
Schools: Engineering
Uncontrolled Keywords: MOSFET; high-frequency transformers; impedance matching; load (electric); power transistors
Additional Information: ISBN: 0780388453
Last Modified: 04 Jun 2017 01:42

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