DOI: 10.1109/TMTT.2024.3479728   IEEEXplore: https://ieeexplore.ieee.org/document/10745134

Dual-Input Single-Output (DISO) RF PAs, such as Doherty, Outphasing or SLMBA. Experimentally validated on a 400W GaN SLMBA.

3.3 GHz for this demonstration

Two algorithms are proposed to define the optimal input signal for maximum power-added efficiency (PAE): 1) Exploration algorithm to determine the input space for safe PA operation. This algorithm progresses through a peaking detection process, a carrier sweep, observation of peaking startup, testing peaking ramp-up over a reduced set of input conditions (to maintain safe operation), and performing a final sweep with a full set of safe input conditions (up to the maximum PA output power). 2) Extraction algorithm to derive the optimal excitation for maximum efficiency based on the exploration algorithm results. This algorithm interpolates the extraction data to perform PAE optimization. Adapting for PA performance variations over time due to aging or the environment, can be achieved by rerunning the exploration periodically around the optimized driving conditions.

Telecommunications RF and microwave power amplifiers with high PAPR requirements.

Algorithms validated in simulation for Doherty and Outphasing DISO PAs and experimentally in a sLMBA DISO PA. Experimental performance – 30% to 35% backoff PAE; ~45% PAE at peak power; ~50% peak PAE;