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The high power amplifier with class AB operation has a large memory effect and high non-linearity. The usual AM-AM and AM-PM data cannot properly describe the large distortion characteristics. We present an accurate block model of the amplifier based on the two tone transfer characteristics. The measurement setup of the two tone transfer characteristics are described. The measured and modeled amplitude and phase data of the two tone harmonics versus input power level are presented. This behavioral model will be very useful for the design of a predistortion linearizer of high power amplifiers and for the nonlinear system simulation with a large memory effect.