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Worksheet: Non-inverting Amplifier

<^< Non-inverting Amplifier | Course Index | Differential Amplifier >^>(:nl:)

Objective: To investigate a non-inverting operational amplifier.
Underpinning knowledge: Operational amplifier symbols and connections.
Apparatus: TINA circuit file, or apparatus to make the following circuit.

TINA Circuit File: Click here to download circuit file
Initial Settings: V'_in_' = 1V, R'_IN_' = R'_F_' = 100k&#937;.
Requires: Paper, Linear graph paper, pen or pencil.
Instructions:

(a) Set V'_in_' = +1V

(b) Set R'_IN_' = R'_F_' = 100k&#937;

(c) Measure and record the values of V'_in_' and V'_out_' (using VM1).

(d) Repeat (c) for each of the following conditions:

* R'_F_' = 300k&#937; * R'_F_' = 500k&#937; * R'_F_' = 700k&#937; * R'_F_' = 900k&#937;

(e) Set V'_in_' = -1V

(f) Repeat steps (b) to (d) above.

Observations:

(a) Comment on the results obtained.

(b) Show that the output voltage, Vout, of the amplifier is given by: Vout = AV x V'_in_' where AV is the voltage gain of the amplifier given by: AV = 1 + R'_F_'/R'_IN_'

Further work:

With R'_F_' set to 900k&#937;, vary the input voltage, V'_in_', from -1V to +1V in appropriate steps and record values of Vout. Use these values to plot a graph showing the relationship between V'_out_' and V'_in_'. What does the slope of this graph indicate? Compare the graph with that obtained from the inverting amplifier assignment

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