Receiver

A receiver comprising:

• a pre-stage variable gain amplifier configured to amplify an RF signal received by an antenna;
• a frequency converter configured to convert an output signal of the pre-stage variable gain amplifier into a low frequency signal to output the low frequency signal;
• a filter unit configured to selectively extract a receiving channel frequency band component from the low frequency signal;
• a post-stage variable gain amplifier configured to amplify the output signal of the filter unit;
• a pre-stage amplifier controller configured to adjust a gain of the pre-stage variable gain amplifier so that an output amplitude of the frequency converter approaches a target value;
• a post-stage amplifier controller configured to adjust a gain of the post-stage variable gain amplifier so that an output amplitude of the post-stage variable gain amplifier approaches a target value;
• and
• an adaptive controller configured to detect a receiving status including at least one of presence or absence of an interference wave and a strength of a field intensity based on the gain of the pre-stage variable gain amplifier, the gain of the post-stage variable gain amplifier and an output signal amplitude of the post-stage variable gain amplifier, and control an operational current of at least one of parts inside of the receiver based on the detected result.