Design and optimization of a high-efficiency current-biased reverse load modulated power amplifier with impedance and performance constraints

• An evolutionary-computation optimization method is proposed for designing broadband high-efficiency current-biased reverse load-modulation power amplifiers (CB-RLM PAs). • Multi-state impedance trajectory constraints and in-band performance deviations are combined into a comprehensive objective function for matching network design. • A broadband CB-RLM PA covering 0.6–1.8 GHz was designed and fabricated, validating the optimization approach. • Measured efficiencies exceed 43.6% at saturation, 6 dB PBO, and 8 dB PBO, with saturated output power of 40.9–41.5 dBm.