An 80W Power Amplifier with 50% Efficiency at 8dB Power Back-off over 2.6-3.8 GHz

Saad, Paul; Hou, Rui; Hellberg, Richard; Berglund, Bo

doi:10.1109/mwsym.2019.8701113

Cited by 16 publications

(1 citation statement)

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“…By introducing techniques such as post-matching [5]- [12], complex combining loads [13], [14], modified load modulation network [15], [16] and dual-mode operation [17], [18], the bandwidth of the DPA has been greatly extended. Recently, some new PA architectures with high back-off efficiency and broadband feature have also been presented with novel load modulation operation, such as the load modulated balanced power amplifiers (LMBAs) [19]- [26] and distributed efficiency amplifiers (DEPAs) [27], [28]. Nevertheless, most of these techniques only focus on the fundamental impedance conditions, the high efficiency performance of the DPAs might not be guaranteed in the entire designed band.…”

Section: Introductionmentioning

confidence: 99%

Broadband RF-Input Continuous-Mode Load-Modulated Balanced Power Amplifier With Input Phase Adjustment

Pang

Chu

et al. 2020

IEEE Trans. Microwave Theory Techn.

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This paper presents the theory and design methodology of broadband RF-input continuous mode load modulated balanced power amplifier (CM-LMBA) by introducing the continuous mode output matching networks in the LMBA architecture. It is illustrated that the continuous mode impedance condition can be achieved by properly adjusting the phase difference between the different PA branches in the proposed CM-LMBA during the entire load modulation process. An RF-input CM-LMBA with 1.45-2.45 GHz bandwidth using commercial GaN transistors is designed and implemented to validate the proposed architecture. The fabricated CM-LMBA attains a measured 11.2-13.4 dB gain and around 40 Watts saturated power. Power added efficiency (PAE) of 46.4-56.5% and 43.2-50.3% is achieved at 6 dB and 8 dB output power back-off throughout the designed band. When driven by a 100 MHz OFDM signal with 8 dB peak to average power ratio (PAPR), the proposed CM-LMBA achieves better than -46 dBc adjacent channel leakage ratio (ACLR) and higher than 45% average PAE after digital pre-distortion at 1.8 GHz and 2.1 GHz.

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