Expandable on-chip back propagation learning neural network with 4-neuron 16-synapse

摘要

A expandable neural network with on-chip back propagation learning is provided in the present invention. The expandable neural network comprises at least one neuron array containing a plurality of neurons, at least one synapse array containing a plurality of synapses, and an error generator array containing a plurality of error generator. An improved Gilbert multiplier is provided in each synapse where the output is a single-ended current. The synapse array receives a voltage input and generates a summed current output and a summed neuron error. The summed current output is sent to the input of the neuron array where the input current is transformed into a plurality of voltage output. These voltage output are sent to the error generator array for generating a weight error according to a control signal and a port signal.