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Load Modulated Balanced Amplifier Design Method Based on Complex Impedance Trajectories
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DOI：10.1109/JMW.2021.3129168.png)
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This paper presents a design methodology for a load modulated balanced amplifier (LMBA) focusing on AMPM distortion mitigation. By introducing second harmonic control as a degree of design freedom, a complex load trajectory can be selected to compensate for AMPM nonlinearities in the device without substantially affecting efficiency. A mathematical derivation is accompanied by a design procedure based on closed-form equations to fabricate an LMBA based solely on load-pull data. The theory is validated through the measured comparison of three different designs operating at 2.4 GHz in a pseudo-RF-input Doherty-like LMBA configuration, with class-J, -B, and -J* main PAs. The class-J prototype outperforms the other designs with 54% and 49% drain efficiency at peak output power and 6-dB back-off, respectively, and only 4 degrees of AM-PM across this power range. When driven with a 10-MHz, 8.6-dB PAPR LTE signal, 40.5% average efficiency is achieved with better than -40.5 dBc ACLR without digital predistortion.
Keyword:
Class J
Doherty power amplifier
gallium nitride
load modulated balanced amplifier
power amplifiers
期刊
I
IF:
4.9
论文数:
468
被引数:
1.7K
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