A Clock-Tuned Digital Memristor Emulator

Memristors are inherently frequency-dependent devices that may be limited by a variety of practical constraints such as operating frequency ranges of commercially available devices, or complexity of analog circuit implementations that emulate memristor behavior. Therefore, a novel clock-tuned digital memristor emulator is presented, where the frequency-dependent behavior of the memristor can be tuned over a range of two decades. An external clock provides simple adjustment of the operating frequency range and frequency-dependent behavior of the memristor, without requiring any modification of firmware or hardware. The digital memristor is implemented in embedded software on a microcontroller with an integrated analog-to-digital and digital-to-analog converter, providing a reconfigurable platform that can support other non-ideal memristor characteristics. Measurements of a prototype demonstrate a clock-tuned memristor with pinched hysteresis loop v-i curves that are unchanged over an operating frequency range of 100:1.