Abstract: Many radio frequency (RF) power amplifiers (PAs) work in Class AB for the consideration in both lineari ty and efficiency. For the best performance of Class AB PA, the optimization of PA's bias circuit is necessary. This paper presents a novel class AB PA design technique based on Volterra Series analysis. In Class AB PA design, the best bias cir cuit can be calculated by using this design technique. Consequently the periods of PA忆s design and experiment can be short ened. A test sample is fabricated and the measurement results verify the effectiveness of this design technique.