An artificial neuron is formed from an input subcircuit, a capacitor free
leaky integrator subcircuit, and an output switching subcircuit. The
input subcircuit is configured to supply a pulsed input signal. The
capacitor free leaky integrator subcircuit is configured to supply a
parasitic capacitance and to utilize the parasitic capacitance to provide
differing time constants for the rising and falling edges of an output
signal produced in response to the pulsed input signal. The output
switching subcircuit s configured to, upon receipt of a sufficient output
signal from the capacitor free leaky integrator subcircuit, switch off
the input subcircuit and to release a neuron firing signal.