A novel charge-metering stimulus amplifier is proposed for high performance neural prosthesis stimulation. The new charge-based approach with feedback has low charge error 0.5%, low charge imbalance 0.2%, and high power efficiency. Charge-metering stimulus amplifier can be implemented using advanced 0.18mum CMOS technology and is compatible with mixed-signal system-on-a-chip (SoC) implantable devices. It also has the capability to monitor the electrode-tissue contact quality and estimate the interface impedance in real-time for robust stimulation.
['Xiang Fang', 'Jack Wills', 'John J. Granacki', 'Jeff LaCoss', 'Artak Arakelian', 'James D. Weiland']
Novel Charge-Metering Stimulus Amplifier for Biomimetic Implantable Prosthesis