Device and method for presdistoring an input signal

摘要

A device, comprising a storage means (51) for storing phase change values, and a phase offset adding means ( 50 ) for predistorting an input signal at an amplifier means is disclosed. A controller means (52) is connected to the storage means ( 52 ) and the phase offset adding means ( 50 ). Said controller means ( 52 ) is adapted to retrieve phase change values from the storage means ( 51 ), and output an offset signal to the phase offset adding means ( 50 ), which is adapted to add said offset signal to the input signal. The invention also discloses a method for predistorting an input signal at an amplifier means (30) by retrieving phase change values from a look-up table stored in the storage means ( 30 ) in response to an indication to change the gain level of the amplifier means ( 30 ).