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OperationalAmplifierCircuits /

Worksheet: Direct Coupled Amplifier

<^< Direct Coupled Amplifier | Course Index | Transistor Amplifier Circuits >^>(:nl:)

Objective: To investigate a direct coupled 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 at 1kHz, R'_IN_' = 100k&#937;, R'_F_' = 500k&#937;.
Requires: Paper, Linear graph paper, pen or pencil.
Instructions:

(a) Set V'_in_' = 1V at 1 kHz

(b) Set R'_IN_' = 100k&#937;, R'_F_' = 500k&#937;

(c) Select 'AC conditions'

(d) Observe the output waveform produced by the amplifier. Sketch two complete cycles of the output waveform and include labelled axes of voltage (V'_out_') and time (t).

(e) Repeat (d) for R'_F_' = 1M&#937; and R'_F_' = 2M&#937;.

Observations:

(a) Comment on the waveforms produced. Do these indicate a phase inversion?

(b) Show that the voltage gain, AV, of the amplifier is given by: AV = -R'_F_'/R'_IN_'

(c) Explain what happened when R'_F_' = 2M&#937;. What caused the distortion in the output waveform?

Further work:

Design an inverting amplifier with a voltage gain of 40 and an input resistance of 20k&#937;. Sketch the circuit diagram for the amplifier showing the component values. Test the amplifier using TINA and verify that a voltage gain of 40 is achieved.

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