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3 marksOperational Amplifiers

CAPE Physics Unit 2 · 2001 · Paper 2 · Question 2(a)

An operational amplifier has an open loop gain A_0, whose frequency dependence is shown in a Bode plot.

Draw a circuit diagram to show how the operational amplifier could be used over a wider range of frequencies at a reduced gain.

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Other parts of this question

  1. 2(b)State what feature allows the gain to be reduced.[1 mark]
  2. 2(c)State what adjustment can be made to your circuit to lower the gain.[2 marks]
  3. 2(d)State what effect(s) this would have on the amplifier.[2 marks]
  4. 2(e)Given that the closed loop gain is related to the open loop gain by A = A_0 / (1 + β A_0), where β is a negative fraction of output fed back to the input,…[2 marks]

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