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The proposed low-power bandgap reference voltage circuitry is specially designed for a temperature sensor of a retinal prosthesis. Retinal prosthesises have great potential for restoring vision to patients suffering from age related macular degeneration (AMD) and retinitis pigmentosa (RP). Here a circuit is proposed and implemented on 65 nm IBM CMOS process, which generates a reference of 700 mV from a power supply of the 1.2 V while consuming the 23 μW at room temperature. The proposed bandgap achieves a temperature coefficient (TC) of 16 ppm/°C without trimming for the temperature range (TR) of 20°C to 50°C.