Memory cross Volterra model for Doherty power amplifier with group delay mismatch

A Memory Cross Volterra model for Doherty power amplifiers (PA) with delay mismatch is presented in this letter. During the design process of amplifier, gain, efficiency and operation bandwidth are mostly considered. Delay difficult to avoid kind dual-path circuit, which reduces modeling performance traditional behavioral models. The proposed Model (MCVM) derived from combination three memory polynomial equations mismatch. Simulation results show that MCVM has about 10 dB improvement Normalized Mean Square Error (NMSE) compared Generalized Polynomial (GMP) same complexity level as GMP. In a measurement experiment, PA tested at 3.45 GHz 20 MHz LTE signal. Compared GMP, maximum 2.5 Adjacent Chanel Power Ratio (ACPR), inverse improved -41.7 -44.3.