<^< Non-inverting Amplifier | Course Index | Differential Amplifier >^>
| Objective:
| To investigate a non-inverting operational amplifier.
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| Underpinning knowledge:
| Operational amplifier symbols and connections.
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| Apparatus:
| TINA circuit file, or apparatus to make the following circuit.
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| TINA Circuit File:
| Click here to download circuit file
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| Initial Settings:
| Vin = 1V, RIN = RF = 100kΩ.
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| Requires:
| Paper, Linear graph paper, pen or pencil.
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| Instructions:
(a) Set Vin = +1V
(b) Set RIN = RF = 100kΩ
(c) Measure and record the values of Vin and Vout (using VM1).
(d) Repeat (c) for each of the following conditions:
- RF = 300kΩ
- RF = 500kΩ
- RF = 700kΩ
- RF = 900kΩ
(e) Set Vin = -1V
(f) Repeat steps (b) to (d) above.
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Observations:
(a) Comment on the results obtained.
(b) Show that the output voltage, Vout, of the amplifier is given by: Vout = AV x Vin where AV is the voltage gain of the amplifier given by: AV = 1 + RF/RIN
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| Further work:
With RF set to 900kΩ, vary the input voltage, Vin, from -1V to +1V in appropriate steps and record values of Vout. Use these values to plot a graph showing the relationship between Vout and Vin. What does the slope of this graph indicate? Compare the graph with that obtained from the inverting amplifier assignment
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<^< Non-inverting Amplifier | Course index | Differential Amplifier >^>
