Download Sheet 4

Lab 4: Operational Amplifiers
1.1 OBJECTIVE
1. To sketch the following op-amp circuits and explain the operation of each:
1. Integrator
2. Differentiator.
2. To analyze and design circuits of the type listed in item I above for input & output
impedances, voltage gain and bandwidth.
3. To trouble shoot and analyze faults in the op-amp circuits.
1.2 PRE LAB QUESTIONS
1. Determine the output voltage of each amplifier in Fig (a).
Fig (a)
1.3 EXPERIMENT
(1) Integrator
1.1 Assemble an integrator circuit with R=1 kΩ and C=0.1 µf. Connect Rf of value 1 MΩ
across the capacitor.
1.2 Feed +1V, 500 Hz square wave input.
1.3 Observe the input and output voltages on a CRO. Determine the gain of the circuit and
tabulate the readings in table 1.3.1. Model waveform is shown in fig. 1.3.1(a)
1.4 Plot the input and output voltages on the same scale on a linear graph sheet.
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Mechatronics op-amp Lab 4
(2 )Differentiator
2.1 Assemble a differentiator circuit with R=10 kΩ and C=0.05µf. Connect a resistor R1 of
value 470Ω between the source and the capacitor.
2.2 Feed + 0.1V, 5 kHz triangular wave input.
2.3 Observe the input and output voltages on a CRO. Determine the gain of the circuit and
tabulate the readings in table 1.3.1. Model waveform is shown in fig. 1.3.1(b).
2.4 Plot the input and output voltages on the same scale on a linear graph sheet.
(a)
(b)
Fig. 1.3.1 Waveform for (a) op-amp integrator, (b) op-amp differentiator
Table 1.3.1
op-amp configuration /
circuit
Input signal
Amplitude
Frequency
Output signal
Amplitude
Frequency
Voltage gain
Designed
value
Observed
value
Integrator
Differentiator
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Mechatronics op-amp Lab 4