Abstract: An apparatus, method and computer readable medium are provided for behavioral modeling of a concurrent multiband amplifier. The apparatus includes a memory to store coefficients of a memory polynomial having summations over no more than four indices including memory order and nonlinearity order, and nonlinear terms confined to even powers, and a processor circuitry that executes a model of the multiband amplifier according to the memory polynomial. The coefficients are not indexed over is the memory order index which allows for a substantial reduction in number of coefficients and minimization of memory, but with high memory depth.