Inverting Amplifier, Linear integrated Circuits lab experiment (LIC)
circuit diagram Breadboard wiring etc For |Engineering | Diploma Polytechnic students
Aim: To design and setup an inverting amplifier circuit with OP AMP 741C for a gain of 10,
plot the waveforms, observe the phase reversal, measure the gain.
Equipments/Components:
Sl .No Name and Specification Quantity required
1 Dual power supply +/- 15V 1
2 Function generator (0 - 1MHz) 1
3 Oscilloscope 1
4 Bread board 1
5 IC 741C 1
6 Resistors 2
7 Probes and connecting wires As required.
Principle:
It is a closed loop mode application of opamp and employs negative feedback. The Rf
and Ri are the feedback and input resistance of the circuit respectively. The input terminals of
the opamp draws no current because of the large differential input impedance. The potential
difference across the input terminals of an opamp is zero because of the large open loop gain.
Due to these two conditions, the inverting terminal is at virtual ground potential. So the
current flowing through Ri and Rf are the same.
Ii = If
That is Vin/Ri = - Vo /Rf
Therefore Vo/Vin = Av = - Rf/ Ri,
Here the -Ve sign indicates that the output will be an amplified wave with 1800 phase
shift (inverted output). By varying the Rf or Ri, the gain of the amplifier can be varied to any
desired value.
Procedure
1. Check the components.
2. Setup the circuit on the breadboard and check the connections.
3. Switch on the power supply.
4. Give 1 Vpp / 1 KHz sine wave as input.
5. Observe input and output on the two channels of the oscilloscope simultaneously.
6. Note down and draw the input and output waveforms on the graph.
7. Verify the input and output waveforms are out of phase.
8. Verify the obtained gain is same as designed value of gain.
Design:
Gain of an inverting amplifier Av = Vo/Vin = - Rf / Ri
The required gain = 10,
That is Av = - Rf/ Ri = 10
Let Ri = 1KΩ, Then Rf = 10KΩ
Observations:
Vin = 1 Vpp
Vo=?
Gain, Av = Vo/Vin =?
Observed phase difference between the input and the output on the CRO =?
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