A baseband impedance cancellation technique for wideband multi-transistor amplifiers

van den Heuvel, Indy, Azad, Ehsan M., Omisakin-Edwards, Mark, Cripps, Steve C. ORCID: https://orcid.org/0000-0002-2258-951X, Tasker, Paul J. ORCID: https://orcid.org/0000-0002-6760-7830 and Quaglia, Roberto ORCID: https://orcid.org/0000-0003-3228-301X 2024. A baseband impedance cancellation technique for wideband multi-transistor amplifiers. IEEE Microwave and Wireless Technology Letters 10.1109/LMWT.2024.3390594

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Abstract

A new baseband (BB) impedance cancellation technique is presented for broadband multitransistor amplifier designs. By placing a BB transformer in between the Doherty main and auxiliary amplifier, the BB component of a two-tone signal can be canceled out, resulting in improved efficiency, output power, and linearity over two-tone bandwidth. A 20-W, 6-dB back-off 3.5-GHz Doherty is designed and its performance is measured with and without this cancellation technique. The prototype shows significant improvements for all metrics for tone spacing above 130 MHz when the transformer is used, and it has an efficiency enhancement up to 15% points at 300-MHz tone spacing.

Item Type:	Article
Date Type:	Published Online
Status:	In Press
Schools:	Engineering
Publisher:	IEEE
ISSN:	1531-1309
Date of First Compliant Deposit:	16 April 2024
Date of Acceptance:	14 April 2024
Last Modified:	29 Apr 2024 20:33
URI:	https://orca.cardiff.ac.uk/id/eprint/167986

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