Distortion compensation amplifier

A distortion compensation amplifier performing distortion compensation with a pre-distortion scheme, comprising:

• level detecting means for detecting a level of a signal to be amplified;
• distortion compensation aspect storing means for storing a distortion compensation aspect associated with the level detected by the level detecting means;
• distortion providing means for providing distortion of pre-distortion for the signal to be amplified in the distortion compensation aspect associated with the level detected by the level detecting means based on a storage content of the distortion compensation aspect storing means;
• amplifying means for amplifying the signal provided with the distortion of pre-distortion by the distortion providing means;
• feedback signal taking means for performing detection of the signal amplified by the amplifying means to take a feedback signal;
• distortion level detecting means for detecting a level of distortion contained in the feedback signal for the signal amplified by the amplifying means;
• and
• control means for performing switching such that first update processing of updating the storage content of the distortion compensation aspect storing means is performed so as to reduce an error component between the signal to be amplified and the feedback signal taken by the feedback signal taking means at the time of start of distortion compensation processing and second update processing of updating the storage content of the distortion compensation aspect storing means is performed so as to reduce the level of distortion detected by the distortion level detecting means when the error component is reduced to satisfy a predetermined condition using a predetermined threshold.