Output Signal Re-Injection in Load-Modulated Balanced Amplifiers for RF Bandwidth Improvement

Output Signal Re-Injection in Load-Modulated Balanced Amplifiers for RF Bandwidth Improvement

This letter discusses the theory, simulation, and experimental characterization of a load-modulated balanced amplifier (LMBA) where the control signal power (CSP) is obtained by re-injecting part of the output RF signal. Compared to the standard balanced load-modulated power amplifier (PA), this app...

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Veröffentlicht in:IEEE microwave and wireless technology letters (Print) 2023-10, Vol.33 (10), p.1-4
Hauptverfasser: Yuan, Tonghui, Quaglia, Roberto, Chaudhry, Kauser, Azad, Ehsan, Powell, Jeff R., Cripps, Steve C.
Format: Artikel
Sprache:eng
Schlagworte:
Broadband
Directional couplers
Frequency modulation
Impedance
load modulation
Modulation
Phase shifters
Power amplifiers
power amplifiers (PAs)
Power generation
Push-pull amplifiers
Radio frequency
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Beschreibung
Zusammenfassung:This letter discusses the theory, simulation, and experimental characterization of a load-modulated balanced amplifier (LMBA) where the control signal power (CSP) is obtained by re-injecting part of the output RF signal. Compared to the standard balanced load-modulated power amplifier (PA), this approach does not require an external amplification of the CSP. The potential of this technique is explored experimentally with a balanced PA (BPA) working on 1400-3400-MHz band, using an external off-the-shelf directional coupler and manual phase shift adjustment. The induced load modulation can lead to a 10% increase of power added efficiency, or 1 dB of output power, across the frequency band of operation compared to the BPA.
ISSN:2771-957X
2771-9588
DOI:10.1109/LMWT.2023.3305812