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. Author manuscript; available in PMC: 2011 Dec 1.
Published in final edited form as: IEEE Trans Neural Netw. 2010 Oct 18;21(12):1950–1962. doi: 10.1109/TNN.2010.2083685

Fig. 6.

Fig. 6

Circuit diagram for a single integrate and fire silicon neuron. PW control determines the pulsewidth of the output spikes, Discharge determines how long the membrane discharges for after a spike. Vthresh is the spike threshold. The weights each have an 8-bit programmable magnitude and a sign bit. Adaptation is implemented using an external RC circuit which filters the output and feeds the result back into one of the analog inputs. The Feedback inputs are internal to the chip and one is connected to the output of each neuron on chip.