Delay-Resistor Implementation of Integrators for Biomimic Artificial Neurons

Delay-Resistor Implementation of Integrators for Biomimic Artificial Neurons Richard B. Wells Bruce Barnes

Background: • Design Application: • Pulse-Mode Artificial Neurons and, in particular, • “Biomimic” Artificial Neurons • Artificial Neurons Specifically Designed to Mimic the Signal Characteristics of Real Neurons

Design Objectives • Mimic Asymmetrical Integration Properties of Biological Neurons • Low Power Dissipation • Small Chip Area • This Circuit is Intended to Operate Within a Feedback Loop in a Biomimic Artificial Neuron

Hodgkin-Huxley Model • The H-H Model Describes the Dynamics of Membrane Potential

Linear Prototype Model Low-Gain Non-Inverting Amplifier • Open-Loop Gain Approximately 2.8 V/V • “Delay Resistors” are P-MOSFETs

Linear Model Transfer Function • Circuit Has 2 Real Poles, 1 Zero • One Pole is a Dominant Pole • This Results in Leaky-Integrator Transfer Function

The Non-Linear Circuit Circuit w/ Buffered Current Source Input

Transfer Characteristic • Current In to Voltage Out

Integrator Response • Fall Time vs. Vbias of Delay Resistors

Response to Pulse Input • Vbias = 1.77 Volts

Thank You. Questions?

Delay-Resistor Implementation of Integrators for Biomimic Artificial Neurons