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4 marksOperational Amplifiers

CAPE Physics Unit 2 · 2005 · Paper 1 · Question 4(b)(iii)

Figure V shows an op-amp comparator with supply voltages +12 V and -12 V, and open-loop gain of 2 x 10^5.

On the axes provided, sketch both the input voltage V_i and the output voltage V_o for TWO complete cycles, clearly indicating maximum voltages and periodic times on the axes.

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Other parts of this question

  1. 4(a)State THREE properties of the ideal operational amplifier (op - amp).[3 marks]
  2. 4(b)(i)Calculate the positive and negative input voltages at which saturation will be reached.[2 marks]
  3. 4(b)(ii)A signal with voltage V_i given by V_i = 0.2 sin(100 pi t) is applied to the comparator in (b)(i). Calculate the frequency of the signal.[1 mark]

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