忆阻器被认为是除了电阻、电容、电感之外的第四个基本电路元件,它是一种非线性二端无源器件,具有“记忆”功能。忆阻器在众多领域中具有巨大的应用潜力,有望推动整个电路理论的变革。介绍了一种改进的忆阻器SPICE模型,在此基础上,设计了一种基于忆阻器的自动增益控制电路。通过SPICE对电路进行仿真,证明该设计是可行的,完全实现了增益的自动控制。 Memristor is considered as the fourth basic circuit element except resistance, capacitance and inductance. It is a non-linear two-terminal passive device with “memory” function. Memristor in many areas has great potential for use, is expected to promote the entire circuit theory change. An improved SPICE model of memristor is introduced. Based on this, an automatic gain control circuit based on memristor is designed. The simulation of the circuit by SPICE proves that the design is feasible and fully realizes the automatic control of gain.