Optimization-Oriented Method for Broadband Doherty Power Amplifier Designs Using Support Vector Regression

In this paper, an optimization-oriented method is presented to design a broadband Doherty power amplifier (DPA) using a technique known as support vector regression (SVR). By combining simulation software with a programming environment, the proposed method can be applied to optimize DPA designs automatically. For verification, a 20-W DPA design is optimized from 1.5 to 2.3 GHz. Measured results show that the optimized DPA achieves a 6 dB back-off efficiency of 46–55 % and a saturated efficiency of 48–68 % across the band, with saturated output power varying from 42.6 to 44.30 dBm.