Optimization of out-of-band impedance environment for linearity improvements of microwave power transistors


Chaudhary, Muhammad Akmal and Memon, Zulfiqar Ali and Yusoff, Zubaida and Lees, Jonathan and Benedikt, Johannes and Tasker, Paul (2018) Optimization of out-of-band impedance environment for linearity improvements of microwave power transistors. In: 2018 5th International Conference on Electrical and Electronic Engineering (ICEEE), 3-5 May 2018, Istanbul, Turkey.

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This paper introduces a novel method that allows the presentation of specific, broadband impedances to a DUT by loadpull. To investigate this method, a derivative of class J power amplifier termed BJ is emulated, which effectively lies between class J and class B along the reactive routes on the Smith chart. The mode helps explore baseband linearization approach and its suitability when using continuous mode architectures. Adopting out-of-band impedance optimization technique allows to present impedances and move progressively from a completely real set of loads to completely imaginary set of loads in a deterministic and systematic way. This further extends a view to look at how well the emulated mode linearizes at a set of BJ contour points along the way. The method uses multiple modulated signal sources, phase synchronized at both radio frequency (RF) and intermediate frequency (IF) to provide a complete multi-harmonic broadband loadpull capability controlled by a single local oscillator and allows complete impedance control at the DUT current generator plane.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Broadband
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7800-8360 Electronics > TK7871 Electronics--Materials
Divisions: Faculty of Engineering (FOE)
Depositing User: Ms Rosnani Abd Wahab
Date Deposited: 30 Mar 2021 19:51
Last Modified: 30 Mar 2021 19:51
URII: http://shdl.mmu.edu.my/id/eprint/7571


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