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3 marksOperational Amplifiers

CAPE Physics Unit 2 · 2011 · Paper 2 · Question 5(b)(i)

The circuit in Figure 5 (a) is modified by adding a 2.0 M-ohm feedback resistor and a 0.4 M-ohm resistor between the inverting input P and earth, with the ac supply reconnected between Q and earth.

Draw the resulting circuit and state the name of this type of circuit.

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Other parts of this question

  1. 5(a)(i)Explain the terms 'bandwidth' and 'feedback' as applied to operational amplifiers (op-amps).[2 marks]
  2. 5(a)(ii)Sketch, on the same axes, the input waveform and the output waveform produced from the open-loop op-amp circuit in Figure 5 (a).[3 marks]
  3. 5(a)(iii)Explain the shape of the waveform shown in Figure 5 (b) when a constant voltage of 0.5 V is applied to non-inverting terminal Q.[2 marks]
  4. 5(b)(ii)Calculate the voltage gain of the circuit.[3 marks]
  5. 5(b)(iii)Calculate the MAXIMUM input voltage for no saturation at the output.[2 marks]

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