公开(公告)号：WO2005025056A8

公开(公告)日：2005-12-15

申请号：PCT/JP2004008897

申请日：2004-06-24

Applicant: SHARP KK ,  HATAYAMA KASUMI ,  KUBOTA MINORU

Inventor： HATAYAMA KASUMI ,  KUBOTA MINORU

IPC: H03G3/30 ,  H03G3/20 ,  H04B1/16

CPC classification number: H03G3/3052

Abstract: 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.

Abstract translation: 提供了一种能够以高精度容易地执行增益控制的自动增益控制放大装置。 反馈增益控制电路（FB）（30）包括：积分电路（31），用于检测放大或衰减后级的接收信号或输出信号DIN的AGC放大器的放大输出信号的功率值; 比较电路[1]（32），其用于例如以3dB为单位计算粗略精度的第一校正值A1，并将其设置在第一校正值记录电路（37）中;以及比较电路[2] ），用于例如以0.5dB为单位计算精确精度的第二校正值A2，并将其设置在第二校正值记录电路（38）中。 在控制值计算电路（39）中，将第一校正值A1和第二校正值A2之和乘以dB单位增益控制单位步长，以输出第二控制值CFB，使得增益控制值 通过校正预先设置的第一控制值或者由检测到接收信号的信号功率电平的RSSI信号产生的第三控制值来计算AGC放大器的输出。