Correlation learning rule in floating-gate pFET synapses

摘要

We study the weight dynamics of the floating-gate pFET synapse andnthe effects of the pFET's gate and drain voltages on these dynamics. Wenshow that we can derive a weight update rule such that the equilibriumnweight value is proportional to the correlation between the gate andndrain voltages. In particular, we want a rule of the form Τ'nΔW˙=-ΔW+ΗE[xy], where x is a voltage signal on thengate terminal and y is a voltage signal on the drain terminal. We obtainnthis rule by making a linear approximation to the weight dynamics aroundna given equilibrium point. We develop this approximation by consideringnthe basic functional form of the system dynamics and then examining theneffects of the gate and drain voltages on the specifics of this form