In this work, we present a low-power subthreshold implementation of the Izhikevich neuron model, inspired by the circuit introduced by Wijekoon and Dudek. The circuit, designed in the UMC 65nm process, consumes 11.74fJ/spike at a 0.18V supply voltage, while operating on a biological timescale and allowing analog tunability of control voltages so as to exhibit different spiking behaviors. The circuit comprises an integrated digital spike transceiver that communicates with AER arbitration circuitry and generates reset pulses.