By the present invention is provided an inventive radio transmitter and a
method to operate a radio transmitter, by which the quality of a
transmitted radio signal can be improved. The radio transmitter comprises
at least one digital filter having adjustable parameters. Via a control
signal input the transmitter can receive a feedback signal being
indicative of the output signal from the transmitter. The radio
transmitter comprises programmable digital circuitry adapted to analyzing
the feedback signal and to generating an analysis result. The
programmable digital circuitry is further adapted to adjusting the
adjustable parameters of the digital filter in accordance with the
analysis result.