AUTOMATIC GAIN CONTROL AMPLIFICATION DEVICE, RECEPTION DEVICE, AND RADIO COMMUNICATION DEVICE

摘要

There is provided an automatic gain control amplification device capable of easily performing gain control with a high accuracy. A feedback gain control circuit (FB) (30) includes: an integration circuit (31) for detecting a power value of an amplification output signal of an AGC amplifier amplifying or attenuating a reception signal or an output signal DIN of the latter stage; a comparison circuit [1] (32) for calculating a first correction value A1 of rough accuracy in 3 dB unit, for example, and setting it in a first correction value recording circuit (37), and a comparison circuit [2] (34) for calculating a second correction value A2 of fine accuracy in 0.5 dB unit, for example, and setting it in a second correction value recording circuit (38). In a control value calculation circuit (39), a sum of the first correction value A1 and the second correction value A2 is multiplied by a dB-unit gain control unit step so as to output a second control value CFB so that the gain control value for the AGC amplifier is calculated by correcting the first control value set in advance or a third control value generated by the RSSI signal which has detected the signal power level of the reception signal.