Figure 3. Operational windows of capacitance.

(a) Window of C₁ and C₂ (grey zone) for successful spiking in due course, evaluated by time-dependent calculation. The inset shows the NLIF neuron circuit with parameters used in this calculation. Four combinations of C₁ and C₂, α (7 nF, 2 nF), β (3 nF, 2 nF), γ (3 nF, 4 nF), and δ (3 nF, 4 nF), are sampled and voltage-time behaviors of NLIF neurons with the capacitance combinations are plotted in (b,c). Input current I_in is shown in (d). For case β, the evolution of V₁, V₂, R_S1, and R_S2 is zoomed in in (e,f) to identify the self-consistent relation between them. The black and the red dashed line denote thresholds for on- and off-switching, respectively.