the predistorter 25 u2032 the second signal component x u2032 52 is a non linearity dependent on a high pass filtered non linearity the characteristics of the second signal component x u2032 52 makes the predistorter 92 particularly suitable for use in combination with linedrivers for which it is not possible to disregard the impact of distortion generated in the differential stage of the linedriver it is apparent to a person skilled in the art that the inventive predistorters described above can be realised in many different ways the inventive digital predistorter can be realised in hardware with means of digital circuits or as software in a signal processing circuit the inventive analogue predistorter can be realised by means of operational amplifiers and analogue circuits inventive methods for predistortion have become apparent from the descriptions of the inventive predistorters described above fig1 shows a flow diagram of such an inventive method of predistortion the method includes a step 81 wherein a first signal component is produced based on an input signal in some cases the input signal must be delayed in a step 82 a second signal component is produced by means of high pass filtering a non linear function of the input signal in some cases as shown in fig1 the second signal component is created from a second non linear function that depends on the high.