An improved memristive current mirror circuit for continuous adjustable current output

Abstract

The traditional mirror current source circuit has been widely used in analog circuits. However, the output current of this circuit is not adjustable after the circuit is manufactured, which is a difficult issues. To solve this problem, this paper proposes a memristive continuously adjustable cascode current source. In this paper, we introduce two additional MOS transistors and a memristor to the circuit architecture of the cascode current mirror. This modified design achieves electrical isolation between the improved cascode current source and the memristor control circuit. By incorporating a memristor control circuit, we are able to regulate the memristance in the main circuit, which in turn allows for continuously adjustable output current. The mathematical relationship between the control signal and the output current of the memristor control circuit is derived in this paper, and the mathematical model is verified using PSPICE. The simulation results show that the continuously adjustable cascode current source based on the memristor achieves continuous regulation of the output current and high accuracy of the output current. This paper provides a technical solution to the problem that the traditional current source circuit cannot realize the continuous adjustable output current.