Digitally Assisted Load Modulated Balanced Amplifier for 200W Cellular Infrastructure Applications

Srinidhi, E. R.; Masood, Mir; Sharma, Tushar; Staudinger, Joseph; Dhar, Sagar K.; Rashev, Peter; Tucker, G.; Ghannouchi, Fadhel M.

doi:10.1109/ims30576.2020.9223833

Cited by 5 publications

(1 citation statement)

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“…3. According to (10), in order to maintain a constant V CA,doherty , the slopes of CA and BA1 fundamental currents with respect to β should be constant. Thus, the scaled current curve of BA1 is plotted in Fig.…”

Section: A Modeling Of Carrier and Peaking Generatorsmentioning

confidence: 99%

Linear Hybrid Asymmetrical Load-Modulated Balanced Amplifier With Multiband Reconfigurability and Antenna-VSWR Resilience

Guo,

Cao,

Chen

2024

IEEE Trans. Microwave Theory Techn.

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This paper presents the first-ever highly linear and load-insensitive three-way load-modulation power amplifier (PA) based on reconfigurable hybrid asymmetrical load modulated balanced amplifier (H-ALMBA). Through proper amplitude and phase controls, the carrier, control amplifier (CA), and two peaking balanced amplifiers (BA1 and BA2) can form a linear high-order load modulation over wide bandwidth. Moreover, it is theoretically unveiled that the load modulation behavior of H-ALMBA can be insensitive to load mismatch by leveraging bias reconfiguration and the intrinsic load-insensitivity of balanced topology. Specifically, the PA's linearity and efficiency profiles can be maintained against arbitrary load mismatch through ZLdependent reconfiguration of CA supply voltage (VDD,CA) and turning-on sequence of BA1 and BA2. Based on the proposed theory, an RF-input linear H-ALMBA is developed with GaN transistors and wideband quadrature hybrids. Over the design bandwidth from 1.7-2.9 GHz, an efficiency of 56.8%−72.9% at peak power and 49.8%−61.2% at 10-dB PBO are measured together with linear AMAM and AMPM responses. In modulated evaluation with 4G LTE signal, an EVM of 3.1%, ACPR of −39 dB, and average efficiency of up to 52% are measured. Moreover, the reconfigurable H-ALMBA experimentally maintains an excellent average efficiency and linearity against arbitrary load mismatch at 2 : 1 VSWR, and this mismatch-resilient operation can be achieved at any in-band frequencies. The overall measured performance favorably outperforms the state-of-the-art.

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Section: A Modeling Of Carrier and Peaking Generatorsmentioning

confidence: 99%