Spike neural network circuit including self-correcting control circuit and method of operation thereof

A spike neural network circuit comprising:

• a self-correcting control circuit configured to generate an input signal and a first control code;
• a bias voltage generation circuit configured to generate a first bias voltage based on the first control code;
• a synaptic circuit including a first synaptic column configured to perform an operation of the input signal and a first weight signal based on the first bias voltage and to generate a first operation signal;
• a neuron circuit including a first neuron configured to generate a first output signal based on a comparison of the first operation signal and a threshold voltage;
• and
• a spike comparison circuit configured to generate a first comparison signal corresponding to a difference between an actual number of pulses included in the first output signal and a target number of pulses indicated by a reference number, and
• wherein the self-correcting control circuit is further configured to generate a second control code for correcting the first bias voltage based on the first control code and the first comparison signal,
• wherein the bias voltage generation circuit is further configured to generate a second bias volage that is the same as the first bias voltage based on the second control code when the actual number of pulses in the first output signal is the same as the target number of pulses, and configured to generate the second bias voltage different from the first bias voltage based on the second control code when the actual number of pulses in the first output signal is different from the target number of pulses, and
• wherein the self-correcting control circuit is further configured to generate the second control code so as to make the bias voltage generation circuit generate the second bias voltage greater than the first bias voltage when the actual number of pulses is less the target number of pulses, and so as to make the bias voltage generation circuit generate the second bias voltage smaller than the first bias voltage when the actual number of pulses is greater than the target number of pulses.