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This article presents a technique for load-modulated balanced amplifiers (LMBAs) to achieve a continuum of load modulation (LM) ratio. This has been possible in prior arts using asymmetrical auxiliary devices. In contrast, the proposed technique employs identical auxiliary devices. A LM ratio is enabled by a specific coupling factor of the power-combining coupler at the output. The proposed LMBA technique is demonstrated through the design, implementation, and measurement of a concurrent wideband LMBA operating across 3. 1–4. 2 GHz. The prototype achieves a peak output power of 48. 1 0. 6~ dBm, with drain efficiency of 47–58% at peak power and 47–61% at 10-dB power back-off. The concurrent wideband performance is demonstrated by a characterization with 900-MHz new radio (NR) signal with 10-dB peak-to-average power ratio (PAPR). At 37. 8 dBm of average output power, the measurement yields 44% drain efficiency and −44-dBc adjacent channel leakage ratio (ACLR).
Saad et al. (Mon,) studied this question.