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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 several muA up to 4 mA, a pulse width from 20 musec up to over four hundred musec, and a pulse frequency up to over three hundred Hz. The micro current pulses transmitting...
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