-10nt R-453 RFG 50 fg Function Generator 6.6.6 The time constant for the circuit

Question

-10nt R-453 RFG 50 fg Function Generator 6.6.6 The time constant for the circuit with the capacitor is shown below. Calculate the rise time 6.5.7 The rise time for this op-amp w/o feedback capacitor is given by the following equation. The BW for this op-amp is 3 MHz. The BW is a measure of the maximum sine wave frequency the op-amp will amplify without the output voltage dropping. Calculate the rise time and include the value in Table 6.5.1. As the BW goes up, what happens to the rise time? BW 2.86 1+ R. Table 6.5.1 Op-Amp Circuit Calculated trise W/C wolC

Explanation / Answer

i) The rise time given by tau = Rf * Cf = 4.99*10^3*10*10^-9 = 4.9900e-05 seconds

ii) The rise time corresponding to the equation given is

tau = 1 / 2.86*3*10^6/(1 + 4.99*10^3/453) =  1.2604e+07

If the Band width is increased the Rise time decreases

Calculated Rise time w / c   4.9900e-05 seconds w 0 / c 1.2604e+07 seconds

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