Memristive Time Difference Encoder



Prof. Elisabetta Chicca

University of Groningen


Prof. Regina Dittmann

Forschungszentrum Jülich


MemrisTec Young Researcher Awards für beste Präsentation

During MemrisTec2024 the presenters Dimitris Spithouris, Johannes Hellwig and Hugh Greatorex were rated best in terms of their presentation skills by the MemrisTec Board.

“Best oral Award” for Johannes Hellwig at MEMRISYS

During the conference MEMRISYS in Turin, lasting from 5th to 9th of November 2023, Johannes Hellwig received the “Best oral Award” for his talk „ Resolving the Physical Origin of LRS Relaxation in Valence Change Memory”.

Project Description

In the Internet of Things (IoT) era there is a growing amount of sensory data to be processed. IoT sensors often require the use of wireless communication at the cost of high power consumption. Sensors smart enough to compute data are needed to reduce the communication load and can offer the advantage of local decision making. While there are several advances in the field of sensors and sensor networks, the technology for complex processing at the sensing node is still to be developed, especially for applications requiring compact low-power systems operating with very low latencies.

In this project, we will empower a recently proposed computational element, namely the TDE, suitable for low-latency and low-power sensory information processing, with the advantages provided by a hybrid CMOS-memristive implementation. We will engineer volatile redox-based memristive devices with tailored decay times to replace the capacitor used in the CMOS implementation. This will guarantee compactness while enabling the achievement of long time constants (from hundred of milliseconds to seconds) prohibitive for analog CMOS. The combination of short (from microseconds to tens of milliseconds) and long time constants will further extend the field of application of the proposed computational module.

This project will take advantage from the synergies of two groups with strongly complementary expertise on memristive device development and analog circuit design.The device engineering and CMOS design efforts planned in this proposal will advance the state-of-the-art in memristive devices and hybrid CMOS-memristive systems. The strategy to engineer the decay times of memristive devices is based on elucidating the details of the redox-processes at the oxide-electrode interface, governing the time stability of the resistive states. The knowledge about the underlying physico-chemical processes causing the time decay will provide novel design rules for both volatile and non-volatile memristive devices in the future.

The demonstrator envisioned in this research will enable innovation in smart sensing. We will have the unique opportunity to explore a variety of sensory domains, including vision and audition and possibly touch and olfaction, therefore finding innovative solutions to open sensing problems.

Further involved scientists


Hugh Greatorex

University of Groningen


Johannes Hellwig

Forschungszentrum Jülich


Dimitris Spithouris

Forschungszentrum Jülich