Efficient Self-Adaptive Pseudo-Resistor with Rapid Settling and High Linearity for Neurorecording Front-End Circuits

In this paper, we present a novel self-adaptive pseudo-resistor (A-PR) designed to enhance the performance of neurorecording front-end circuits in terms of settling time, linearity, and tunability. We validate the effectiveness of the proposed A-PR through the implementation of a capacitively- coupled instrumentation amplifier (CCIA) recording front-end using TSMC 40-nm process technology. The results demonstrate that the A-PR enables continuous recording with minimal interruptions, enhancing the system’s robustness and enabling more reliable acquisition of neural signals. Notably, the A-PR achieves a significant reduction in settling time, reaching the millisecond level—1000 times faster than conventional pseudo-resistors—while also exhibiting wide linear characteristics and easy tunability.