Consider the ideal op-amp integrator. Assume the capacitor is initially uncharged. (a) The output voltage is v O = − 5 V at t = 1.2 s after a + 0.25 V pulse is applied to the input. What is the RC time constant? (b) Use the results of part (a). At t = 1.2 s , the input changes to − 0.10 V . (i) At what timedoes v O = 0 ? (ii) At what time does v O = + 5 V .
Consider the ideal op-amp integrator. Assume the capacitor is initially uncharged. (a) The output voltage is v O = − 5 V at t = 1.2 s after a + 0.25 V pulse is applied to the input. What is the RC time constant? (b) Use the results of part (a). At t = 1.2 s , the input changes to − 0.10 V . (i) At what timedoes v O = 0 ? (ii) At what time does v O = + 5 V .
Solution Summary: The author illustrates the required diagram for the integrator op amp circuit.
Consider the ideal op-amp integrator. Assume the capacitor is initially uncharged. (a) The output voltage is
v
O
=
−
5
V
at
t
=
1.2
s
after a
+
0.25
V
pulse is applied to the input. What is the RC time constant? (b) Use the results of part (a). At
t
=
1.2
s
, the input changes to
−
0.10
V
. (i) At what timedoes
v
O
=
0
? (ii) At what time does
v
O
=
+
5
V
.
Given the four statements, which of the following statements are true about an op-amp
integrator?
i. For an op-amp integrator wilh R = 10OKOhms, C = 10UF and a sine wave inpul
waveform, the output waveform is a cosine waveform.
%3D
ii. For an op-amp integrator with R = 100KOhms, C = 10uF and a triangular input
waveform, the output waveform is a square wave.
iii. For an op-amp integrator with R- 100KOhms, C =10uF and a sine wave input
waveform, the output waveform is a sawtooth waveform.
v. For an op-amp integrator with R10OKOhms. C lCuF and a square wave input
waveform, the output waveform is a triangular waveferm.
Boost Converter Design
A boost converter is required to have an output voltage of 8 V and supply a load current
of 1 A. The input voltage varies from 2.7 to 4.2 V. A control circuit adjusts the duty ratio
to keep the output voltage constant. Select the switching frequency. Determine a value for
the inductor such that the variation in inductor current is no more than 40 percent of
the average inductor current for all operating conditions. Determine a value of an ideal
capacitor such that the output voltage ripple is no more than 2 percent. Determine the
maximum capacitor equivalent series resistance for a 2 percent ripple.
Given the four statements, which of the following statements are true about an op-amp
integrator?
i. For an op-amp integrator with R = 100KOhms, C
waveform, the output waveform is a cosine waveform.
10UF and a sine wave input
%3D
ii. For an op-amp integrator with R = 100KOhms, C
waveform, thc output waveform is a squarc wave.
10UF and a triangular input
%3D
%3!
iii. For an op-amp integrator with R = 100KOhms, C
waveform, the output waveform is a sawtooth waveform.
= 10UF and a sine wave input
%3D
iv. For an op-amp integrator with R 100KOhms, C 10uF and a square wave input
waveform, the output waveform is a triangular waveform.
Oi, ii, i
O i, ii, iv
O i iv
O ii, ii
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Electrical Engineering: Ch 5: Operational Amp (2 of 28) Inverting Amplifier-Basic Operation; Author: Michel van Biezen;https://www.youtube.com/watch?v=x2xxOKOTwM4;License: Standard YouTube License, CC-BY