An event-driven POSFET taxel for sustained and transient sensing

We present an event-driven tactile sensing element that encodes both the absolute value of the input force and its variation over time. It is based on the POSFET device and Leaky-Integrate and Fire neurons, connected by a transconductance amplifier; the proposed circuit exploits the advantages of the POSFET device, such as high integration scale, fast response, wide bandwidth and force sensitivity, as well as the advantages of event-driven encoding, such as low latency, low power dissipation, and high temporal resolution, coupled with redundancy reduction.