A micro-stimulator circuitry designed for visual prosthesis based on optic nerve stimulation is presented in this paper. This micro-stimulator is capable of providing a wide range of biphasic current pulses with an amplitude from severalμA up to 4 mA, a pulse width from 20μsec up to over four hundredμsec, and a pulse frequency up to over three hundred Hz. The micro current pulses transmitting to the penetrating multi-electrode-arrays will stimulate optic nerve to elicit phosphenes within visual field. The performances of the proposed micro-stimulator circuitry were studied using the PSPICE program. The simulation results verified the circuit performances are agreed with the expected values.
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