Comments on “SPICE Model of Photomultiplier Tube Under Different Bias Conditions”

The paper “SPICE Model of Photomultiplier Tube Under Different Bias Conditions” is commented. We revisit the mathematical formulation to compensate for some ambiguities in the original manuscript, and point out some inconsistencies in the results and reproducibility of the simulations, as well as in the optimized parameters originally obtained with the PSPICE simulation engine. All simulations are recalculated with the NGSPICE software using the corrected parameters and compared against the original figures. The reproducibility of our simulations is independently verified with PSPICE, as well as by numerically solving the analytical system of non-linear equations using Newton’s method within MATLAB.