1. A signal processing circuit arrangement comprising: a preamplifier circuit configured to: map a first dimension input and a second dimension input to a first subset of a plurality of lookup table coefficients of a two-dimensional (2D) lookup table, wherein the first dimension input and the second dimension input each represent a signal level of one or more input signals; extrapolate from the first subset of the plurality of lookup table coefficients to generate a lookup table output; and apply the lookup table output to the one or more input signals to generate a predistorted input signal for an amplifier.