Quelpr
2 marksOperational Amplifiers

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

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

Deduce the gain of the amplifier when the input resistance is made infinitely large (effectively removed from the circuit).

The mark scheme is shown once you've answered.

Practise this question

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)(v)What would be the input impedance of the resulting circuit?[1 mark]
  8. 2(b)(vi)Identify the practical application for the circuit and state why it is suited for this application.[2 marks]

More practice: the rest of this paper · more Operational Amplifiers questions · all CAPE Physics Unit 2 past papers