%K Power demand, Power measurement, Impedance measurement,
Hydrogels, Current measurement, Simulation, Tactile sensors
%D 2024
%B 2024 IEEE International Symposium on Circuits and Systems (ISCAS)
%J Proceedings - IEEE International Symposium on Circuits and Systems
%I IEEE
%A Z Wu
%A Y Wu
%A A Demosthenous
%C Singapore, Singapore
%O This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
%X This paper presents a differential current driver based on a current feedback structure, designed to drive hydrogel sensors. It achieves low power consumption, low common-mode signal on the load, and high current efficiency. The use of a negative unit gain buffer reduces the common-mode signal on the load arising from process variations. The current driver was designed in a 65-nm CMOS technology with a 3.3 V supply. Simulation results demonstrate a THD of 0.4% at 125 kHz, for 40 μAp-p output current. The common-mode voltage on the load is reduced by 98.96% compared to a conventional topology using two independent drivers. The total current consumption is 60.3 μA, resulting in a current efficiency of 82.9%. The simulated output impedance is 2.76 MΩ at 125 kHz and 1.47 MΩ at 300 kHz.
%L discovery10195849
%T A 199 μW, 82.9% Efficiency Current Driver with Active Common-Mode Reduction for Impedance-Based Tactile Sensors