Doherty-to-Balanced Switchable Power Amplifier

A novel Doherty-to-balanced (D2B) switchable power amplifiers (PAs) architecture based on branch-line quadrature hybrid couplers is presented. It is for the first time unveiled that by switching the 50-Ω loading at isolation port to a short circuit to ground, the balanced amplifier can be fully conv...

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Bibliographic Details
Main Authors: Haifeng Lyu, Yuchen Cao, Kenle Chen
Format: Conference Proceeding
Language:English
Subjects:
balanced amplifier
Couplers
doherty
efficiency
Impedance
Power amplifiers
Power generation
Power measurement
Switches
Switching circuits
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Summary:A novel Doherty-to-balanced (D2B) switchable power amplifiers (PAs) architecture based on branch-line quadrature hybrid couplers is presented. It is for the first time unveiled that by switching the 50-Ω loading at isolation port to a short circuit to ground, the balanced amplifier can be fully converted to a Doherty PA. The proof of the concept is demonstrated using a commercial SP2T SOI switch integrated with a balanced GaN power amplifier for mode reconfiguration. The implemented PA achieves efficient Doherty performance with a peak efficiency of 78.1% at maximum output power of 41.75 dBm, and 60.9% at 6 dB output power back-off (OBO). The balanced mode of this PA offers excellent immunity to load mismatch up to 5:1 VSWR achieving minimum output power fluctuation within 1 dB, as demonstrated experimentally.
ISSN:2576-7216
DOI:10.1109/MWSYM.2019.8700948