Automatic gain control amplifier circuit diagram

Published:2011/7/21 1:23:00 Author:Ecco | Keyword: Automatic , gain control amplifier | From:SeekIC

Figure 1 is automatic gain control amplifier. Figure 1 (a) is the block diagram of automatic gain control amplifier which is composed of the variable gain amplifier VGA, rectifier circuit, reference voltage source and error amplifier. Figure 1 (b) is the actual circuit, A1 may constitute VGA amplifier, of which the gain depends on the ratio of resistance value, that is the RG of the optical coupler, and the maximum gain is 15 times which is decided by the ratio of R2 and R1, and the minimum gain is determined by the minimum value of RG.



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