Memristor-based automatic gain control circuit

The invention particularly relates to a memristor-based automatic gain control circuit. The technical scheme is as follows: the circuit consists of a variable gain amplification module (1), a comparator (4) and a peak value detection module (5); the variable gain amplification module (1) consists of an operational amplifier circuit (2) and a memristor (3); a terminal M2 of the memristor (3) is connected with an input end Rc of the operational amplifier circuit (2); an input end Vi of the operational amplifier circuit (2) is externally connected with an input signal Vin; an output end VVGA of the operational amplifier circuit (2) is respectively connected with an input end VVGAP of the peak value detection module (5) and the input end Vw of a peripheral circuit; a terminal M1 of the memristor (3) is connected with an output end Vc of the comparator (4); an input end ViVGAP of the comparator (4) is connected with an output end ViVGA of the peak value detection module (5); and an input end VREF1 of the comparator (4) is externally connected with a reference electric level VREF. The memristor based automatic gain control circuit provided by the invention has the advantages of simple structure, low cost and high accuracy.