Flexible frequency selective passive circuits based on memristor and capacitor

Abstract

Abstract In analog electronic communication and signal processing applications, programmable analog filters are desirable to reduce the hardware requirement. Memristor is two states configurable nonvolatile resistor, which is small size, low power, and fast switching device. To achieve tunable cut-off frequency and bandwidth, flexible memristor-capacitor (MC) circuits are proposed, which can be applied as low pass, high pass, and band pass filters. They can be fabricated on a flexible polyethylene terephthalate (PET) substrate through electrohydrodynamic (EHD) technique. In the proposed filters, two cut-off frequencies are selected through switching two resistive states of the memristor either in high resistance state (HRS) or low resistance state (LRS), whereas the capacitor has a fixed value. The memristor is composed of graphene quantum dots (GQDs)/poly 4-vinlyphenol (PVP) composite to achieve highly stable and linear behavior and the dielectric layer of capacitor is consisted of graphene/PVP composite. The fabricated MC filters are electrically and mechanically characterized, which are matched quite well with theoretical results. From these results, it can be a good basis for tunable analog filters in wearable electronics.