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Estimate minimum value of input resistance of biomedical amp

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.

2417_input of a biomedical amplifier.png

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.

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