CMOS charge-metering microstimulator for implantable prosthetic device

Charge-metering microstimulator has been shown with higher charge accuracy, less charge-imbalance, and higher power efficiency than conventional current-mode and voltage-mode stimulators. In this paper, a discrete-time charge-metering microstimulator is proposed for implantable prosthetic device. Design techniques like half-clock sampling, high-voltage isolation, integration folding, and periodic discharging are proposed. Low power design is applied through system and function blocks. CMOS 0.18 um process was used with 1.8 V supply voltage and 50 uW power consumption.