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1 markOperational Amplifiers

CAPE Physics Unit 2 · 2012 · Paper 2 · Question 5(a)(ii)

An operational amplifier frequency response curve is analyzed alongside an op-amp circuit and a subsequent logic sensing circuit.

State what is meant by 'negative feedback' in this amplifier.

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Other parts of this question

  1. 5(a)(i)State the type of amplifier circuit shown in Figure 7.[1 mark]
  2. 5(a)(iii)a)Calculate the gain of this amplifier at low frequencies.[2 marks]
  3. 5(a)(iii)b)Calculate the bandwidth of the amplifier using Figures 6 and 7.[3 marks]
  4. 5(a)(iv)What is the peak output voltage for an input signal of peak value 0.052 V and frequency 1.0 x 10^4 Hz?[2 marks]
  5. 5(b)(i)Copy and complete the truth table (Table 3) for the digital circuit shown in Figure 8.[3 marks]
  6. 5(b)(ii)a)State whether the thermistor RT is hot or cold for logic 1 at input A.[1 mark]
  7. 5(b)(ii)b)State whether the LDR RL is in light or darkness for logic 1 at input B.[1 mark]
  8. 5(b)(ii)c)Deduce the environmental conditions required for the LED to be conducting.[1 mark]

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