Method and apparatus for increasing receiver immunity to interference

(57) It is a method for adjusting the profit of a summary receiving circuit, and, thereby, the immunity of the receiver to interference is raised. A circuit has LNA which makes the received signal amplify (1702). The electric power of a received signal is controlled by エネーブル (ing) or disabling LNA according to the electric power of the measured received signal (1704). The received power level is periodically compared with a threshold value (1704). When the received power level exceeds a threshold value, the disable of the LNA is carried out (1706). When 電 Carre Belle who received becomes in less than a threshold value, LNA is エネーブル (ed) again (1708), and the ingredient of an important intermodulation interference is not detected at all (1710). The ingredient of intermodulation interference only エネーブル LNA and is detected by detecting change of the electric power of the measured signal which this produced (1710). When detected change exceeds predetermined quantity, the ingredient of an important intermodulation interference exists and LNA is not エネーブル (ed) again (1706). When change detected when that was not right is less than predetermined quantity, there is no ingredient of an important intermodulation interference and LNA is エネーブル (ed) again (1702).