Automatic Optimization of Input Split and Bias Voltage in Digitally Controlled Dual-Input Doherty RF PAs

Digitally controlled Dual-Input Doherty Power Amplifiers (DIDPAs) are becoming increasingly popular due to the flexible input signal splitting between main and auxiliary stages. Nevertheless, presence of many degrees freedom, e.g., amplitude split phase displacement as well biasing for multiple stages, often involves inefficient trial-and-error procedures reach a suitable PA performance. This article presents automated parameter setting based on coordinate descent or Bayesian optimizations, demonstrating an improvement in performance terms RF output power power-added efficiency (PAE) broadband-modulated signals, yet maintaining linear behavior for, communications applications.