发明名称 |
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.
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申请公布号 |
WO2005025056(A1) |
申请公布日期 |
2005.03.17 |
申请号 |
WO2004JP08897 |
申请日期 |
2004.06.24 |
申请人 |
SHARP KABUSHIKI KAISHA;HATAYAMA, KASUMI;KUBOTA, MINORU |
发明人 |
HATAYAMA, KASUMI;KUBOTA, MINORU |
分类号 |
H03G3/30;(IPC1-7):H03G3/20;H04B1/16 |
主分类号 |
H03G3/30 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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