| 摘要 |
The invention relates to an equaliser circuit for radio-frequency transmission systems to compensate for interference caused by intermodulation in amplifiers. The object of the invention is to achieve linearisation of the transmission response at minimum circuit cost in equaliser circuits of this type. This object is achieved according to the invention in that a pre-equaliser (2) which comprises two parallel-connected auxiliary amplifiers (T1, T2) is connected upstream of the amplifier (3) which causes the intermodulation interference and which supplies the useful signal (B, S, T) with opposite-phase intermodulation interference (J) and that the first (T1) of the two auxiliary amplifiers (T1, T2) supplies, at a predefined intensity, a useful signal (B, S, T) which is affected by at least approximately the same intermodulation interference (J) and to which the unaffected useful signal (-2B, -2S, -2T) supplied by the second auxiliary amplifier (T2) is added in phase opposition at double the pre-defined intensity. <IMAGE>
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