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

WIPO Patent Application WO/2005/025056

A1

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 D_IN 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 C_FB 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.

HATAYAMA KASUMI (JP)
KUBOTA MINORU (JP)

PCT/JP2004/008897

March 17, 2005

June 24, 2004

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SHARP KK (JP)
HATAYAMA KASUMI (JP)
KUBOTA MINORU (JP)

H03G3/30; (IPC1-7): H03G3/20; H04B1/16

JP2003133873A	2003-05-09
JPH06112746A	1994-04-22
JPH10178323A	1998-06-30
JPH0268516U	1990-05-24

Takano, Akichika (9th Floor Salute Bldg., 72, Yoshida-cho, Naka-k, Yokohama-shi Kanagawa, JP)

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