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In implantable electronic medical devices, low power consumption and small size are important requirements to design efficient implantable circuits. As a preprocessing circuit of the retinal prosthesis system, this paper presents two types of image processing circuits: a CMOS median filter and a CMOS binarizing circuit. Owing to the CMOS circuit design utilizing clocked neuron CMOS inverters, the proposed circuits can achieve median filtering and binarizing of the captured image without arithmetic logic circuits. Furthermore, the through-current of neuron CMOS inverters can be suppressed by adjusting the duty cycle of clock pulses. Therefore, the proposed circuits achieve not only simple circuit configuration but also low power consumption. The results of the simulation program with integrated circuit emphasis (SPICE) simulation demonstrate the effectiveness of the proposed circuits.

The Development of a Preprocessing Circuit Using Clocked CMOS Neuron Inverters for a Retinal Prosthesis System