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This paper proposes a new behavioral PA modeling scheme which combines existing pruned Volterra (PV) model with infinite impulse response (IIR) basis functions. These IIR basis functions are inherently composed of a parallel structure of single-pole IIR filters, summed at the output. Performance of this new IIR-PV model is found to be significantly better than existing memory polynomial (MP) and pruned Volterra only (PV) PA models. For the validation, characterization results of 80W Class-AB PA and 240W Asymmetric Doherty PA are presented. Excellent results are obtained, where error between model prediction and measurements is better than -41.7dBc (Class-AB PA) and -42.1dBc (Doherty PA).