High Performance ZPM-Based AC Readout Platform With Enhanced Carrier Suppression

This work presents a modular acquisition platform for biasing and reading 2D crossbar resistive sensor arrays in AC mode based on the Zero Potential Method (ZPM). ZPM minimizes the number of connections and array bond pads while being scalable for arbitrary array dimensions. The system employs a new technique to suppress the non-informative sensor bias component thus allowing the readout of sensor arrays with a wide range of nominal resistances, validated from 1 kΩ to 1.8 MΩ. It can read up to 4 sensors simultaneously from a matrix comprising a maximum of 256 sensors. The platform is functionally demonstrated and characterized using a 4 × 4 resistive array and a 12 × 12 matrix of thin film spin valves, paving the way for a lab-on-chip Micro Total Analysis Systems (μTAS) device. The proposed system can also be employed in a range of applications like memristive reading and writing for neuromorphic systems, robotics sensing, and other applications based on crossbar resistive sensor matrices.