Fast automatic gain control device and control method thereof

The invention discloses a fast automatic gain control device and a control method thereof. The fast automatic gain control device comprises the following parts: a signal gain control module; a peak detection module; a second analog-to-digital conversion module; an overload detection module; a first analog-to-digital conversion module; a fuzzy inference module; a gain adjustment module; and an output module. The method has the following advantages: 1. the fastness of the method is reflected in real-time detection and control of a signal peak when a single is within a measuring range on one hand, on the other hand, the fastness is reflected in that whether the signal is overloaded is monitored in real time, and the gain is switched to the safest gain at the highest speed, a fuzzy inference process variable is reset and reference is provided for outputting effective data in the case of signal overload. 2. Therefore, the method can be used for realizing automatic locking and intelligent split switch of the gain, and effectively preventing the adoption of accurate classification and the control method.