DOI: 10.1109/TMTT.2025.3540876   IEEEXplore: https://ieeexplore.ieee.org/document/10900590

An ultrawideband back-off efficiency-enhanced power amplifier with a hybrid class-G and Doherty design.

0.6 to 3.6 GHz

Switchless transition between Class-G and Doherty modes as the PA main-path phase shift varies with frequency overcomes the fundamental bandwidth limitations caused by matching network phase shifts. The PA delivers optimal back-off efficiency under any phase shift condition while maintaining constant saturation power (Psat) and output back-off (OBO) performance. A dual-bonding wire strategy in the auxiliary transistor connection uses two bonding wires to connect the drain node of the auxiliary transistor to the main-path and postmatching networks (PMNs), respectively. Bonding wires and parasitic capacitance are absorbed into the matching network to minimize the number of auxiliary-path components and their detrimental effects on the PA bandwidth.

High-speed data transmission in next-generation wireless communication systems demanding higher spectral efficiency and broader modulation bandwidth.

38.7–40.2 dBm saturated output power (Psat), 40%–57% and 44%–57% drain efficiency (DE) at 7.5- and 6-dB output backoff (OBO) from 0.6–3.6-GHz. 1.1% or better error vector magnitude (EVM), -45 dBc or better adjacent channel power ratio (ACPR) after digital predistortion with a 40-MHz 256-QAM signal with a peak-to- average power ratio of 7.5 dB.