Mokhti, Zulhazmi A., Lees, Jonathan ![]() ![]() ![]() ![]() |
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Abstract
The effects of the nonlinear drain-to-source capacitance (CDS), or the varactor effect, on the operation of continuous-mode class-B/J power amplifiers (PAs) are described in terms of the mathematical analysis as well as experimental validation. The nonlinear CDS generates harmonic current when the class-B/J drain voltage is applied across it, modifying the theoretical load trajectories on the Smith chart. This is shown to significantly deviate from the continuous-mode assertion of constant power and efficiency. A novel measurement approach called voltage-pull is used to investigate the effects of the second harmonic generation by the varactor in a class-B/J PA mode. Theoretical and experimental results showed the nonlinear CDS degrades the drain efficiency compared to class-B on one half of the class-B/J design space while improving the other half due to the energy upconversion and downconversion, respectively. This paper provides an approach for die nonlinear characteristic optimizations for transistor manufacturers.
Item Type: | Article |
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Date Type: | Publication |
Status: | Published |
Schools: | Engineering |
Publisher: | Institute of Electrical and Electronics Engineers (IEEE) |
ISSN: | 0018-9480 |
Date of First Compliant Deposit: | 24 May 2019 |
Date of Acceptance: | 5 March 2019 |
Last Modified: | 12 Nov 2024 23:45 |
URI: | https://orca.cardiff.ac.uk/id/eprint/122860 |
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