| 摘要 |
A predistortion-based amplifier which compensates for distortions generated by the amplifier when a modulated wave signal is amplified thereby in accordance with a predistortion scheme, based on an envelope information of the modulated wave information. An envelope information detector for detecting information related to the envelope of the modulated signal to be amplified comprises, between an input terminal A1 and an output terminal A1, matching circuits 11, 14, diode circuits 12, 15, 16 for rectifying the modulated wave signal, a stub circuit 13 for removing a carrier component of the signal output from the diode circuits, and a signal converter circuit 17 for converting an envelope signal output from the stub circuit from a current signal to a voltage signal.
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