Transmitter linearized in response to derivative signal and method therefor

Abstract

A transmitter () includes a low power nonlinear predistorter () that inserts predistortion configured to compensate for a memoryless nonlinearity () corresponding to gain droop and another memoryless nonlinearity () corresponding to a video signal. When efforts are taken to reduce memory effects, such as configuring a network of components () that couple to an HPA () to avoid resonance frequencies substantially throughout a video bandwidth (), high performance linearization at low power results without extending linearization beyond that provided by the memoryless nonlinear predistorter (). A look-up table () has address inputs responsive to a magnitude parameter () of a communication signal (). A pre-distorted communication signal () is responsive to the output of the look-up table, a derivative signal (), and possibly one or more variable bias parameters (). The look-up table () is updated in response to an LMS control loop.