An Anodic Current Pulse Modulation Active Charge Balancer for Implantable Electrical Stimulator

Abstract

This paper presents an anodic phase modulation charge balancing method for implantable biphasic bipolar stimulator integrated circuit (IC). The proposed IC, designed using $0.18-\mu m$ CMOS process, consists of a current-mode electrical stimulator with active charge balancing circuit. The proposed active charge balancer uses a simple digital logic circuit consisting of subtractor, comparator, and D-latch and can perform accurate charge balancing by adjusting the magnitude of the anodic current pulse according to the measured net charge.