In the circuit shown below, the op-amp is ideal and the Zener voltage of the diode is 2.5 volts. At the input, unit step voltage is applied, i.e. VIN (t) = u(t) Volts. Also, at t = 0, the voltage across each of the capacitors is zero.
The time 't', in milliseconds, at which the output voltage VOUT crosses −10 V is:
1
2.5
2
5
3
7.5
4
10