Simulating organic thin film transistors using multilayer perceptron regression models to enable circuit design
Résumé
There is increasing interest in using specialized circuits based on emerging technologies to develop a new generation of smart devices. The process and device variability exhibited by such materials, however, can present substantial challenges for designing circuits. We consider the use of three models: a physical compact model, an empirical look up table and an empirical surrogate model based on a multilayer perceptron (MLP) regression. Each is fit to measured discrete organic thin film transistors in the low voltage regime. We show that the models provide consistent results when designing artificial neuron circuits, but that the MLP regression provides the highest accuracy and is much simpler to fit compared to the compact model. The targeted technology exhibits non-ideal behavior such as variable threshold voltage and hysteresis. Using the multiplayer perceptron model, we compare the effect of such variability on the performance of the neuron circuit. We find that these effects alter the neuron firing rate and change the time spent in the on/off states but do not change the basic operation. V g V d V g 2 V d 2 Input Output HL1 HL2 V g V d ln(|I d |)
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