The network demonstrated in figure presents the input of a biomedical amplifier, now the input impedance is seem purely resistive, R and a capacitor, C, is used to block dc.
In that case the source signal is taken as a pulse of amplitude, Vm, and duration, T, described as given below:
VS(t) = Vmu(t) - Vmu(t-T)
It uses the Laplace transform method to establish an expression for the input voltage, Vi, like a function of time.
Therefore establish the degree of the input signal undershoot, Vi, from the baseline at the ending of the pulse duration like a percentage of the pulse amplitude.
Estimate the minimum value of input resistance, R that ensures here that the undershoot does not exceed 5 percent of the pulse amplitude when the duration of the pulse is 100ms and also the capacitance C = 0.33,F.