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1 markOperational Amplifiers

CAPE Physics Unit 2 · 2013 · Paper 2 · Question 2(b)(v)

The op-amp is used as a non-inverting amplifier with feedback resistance Rf = 330 kΩ and input resistance R1 = 3.3 kΩ.

What would be the input impedance of the resulting circuit?

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Other parts of this question

  1. 2(a)(i)Use the graph to determine the open loop d.c. gain of the amplifier.[1 mark]
  2. 2(a)(ii)Use the graph to determine the unity gain bandwidth of the amplifier.[1 mark]
  3. 2(a)(iii)Use the graph to determine the open loop bandwidth of the amplifier.[1 mark]
  4. 2(b)(i)Draw the circuit diagram for this amplifier and label the resistors with their values.[3 marks]
  5. 2(b)(ii)Calculate the gain of the amplifier.[2 marks]
  6. 2(b)(iii)Use the open loop gain-frequency curve in Figure 2 to determine the closed loop bandwidth of this amplifier.[2 marks]
  7. 2(b)(iv)Deduce the gain of the amplifier when the input resistance is made infinitely large (effectively removed from the circuit).[2 marks]
  8. 2(b)(vi)Identify the practical application for the circuit and state why it is suited for this application.[2 marks]

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