An Energy-Efficient Multi-Channel Charge Trackable Inductor-Based Stimulation System
Abstract
The concept of "electroceuticals" has recently emerged, aiming to maximize therapeutic effects by delivering targeted electrical stimulation while minimizing side effects. To realize electroceuticals, it is essential to develop implantable stimulators that meet specific requirements, such as overcoming battery size limitations, ensuring safety, and providing effective electrical stimulation. Therefore, these stimulators must operate with high energy efficiency and have the capability to monitor the amount of charge delivered to the body. However, existing electrical stimulators fail to meet these requirements. Therefore, this study developed a Charge Trackable Inductor-Based Stimulator (CTIBS) that achieves up to 80% of peak stimulator efficiency, with a charge error between anodic and cathodic stimulation being less than 1.6%. Additionally, the number of stimulation channels has been expanded to 16, allowing flexible control over the stimulation area and density. The integrated circuit (IC) chip was designed using a 180 nm RF process, occupying an area of 5 mm².
