Chaudhary, Muhammad Akmal, Memon, Zulfiqar Ali, Yusoff, Zubaida, Lees, Jonathan  ORCID: https://orcid.org/0000-0002-6217-7552, Benedikt, Johannes ORCID: https://orcid.org/0000-0002-9583-2349 and Tasker, Paul ORCID: https://orcid.org/0000-0002-6760-7830
2018.
Optimization of out-of-band impedance environment for linearity improvements of microwave power transistors.
Presented at: 2018 5th International Conference on Electrical and Electronic Engineering (ICEEE),
Istanbul, Turkey,
3-5 May 2018.
2018 5th International Conference on Electrical and Electronic Engineering (ICEEE).
IEEE,
pp. 219-223.
10.1109/ICEEE2.2018.8391334
|
Abstract
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) |
|---|---|
| Date Type: | Publication |
| Status: | Published |
| Schools: | Schools > Engineering |
| Publisher: | IEEE |
| ISBN: | 978-1-5386-6392-9 |
| Last Modified: | 25 Oct 2022 13:38 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/120420 |
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