When an input signal is a non-periodic triangular pulse, an analysis is made of the relation between the input and the output signals. On the basis of the analysis, calculations are made of the trapping time, trapping error and attenuation of the output signal.The non-linear characteristic of the diode is considered according to two different conditions, in the case where the volt-ampere characteristic can be represented in exponential form. The author proposes an iteration form to solve the intermediate region of the two conditions.