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1 markOperational Amplifiers

CAPE Physics Unit 2 · 2004 · Paper 1 · Question 6(b)(iv)

Figure 6 shows an operational amplifier circuit consisting of a buffer amplifier and an inverting amplifier with Ri = 20 kΩ and Rf = 100 kΩ, with an input voltage of 0.5 V.

Calculate the overall gain of the circuit in Figure 6.

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Other parts of this question

  1. 6(a)(i)Explain the effect of negative feedback on the gain of an operational amplifier.[1 mark]
  2. 6(a)(ii)Explain the effect of negative feedback on the bandwidth of an operational amplifier.[1 mark]
  3. 6(b)(i)Draw an inverting amplifier circuit with input resistance Ri and feedback resistance Rf, and use it to explain what is meant by a virtual ground.[4 marks]
  4. 6(b)(ii)Calculate the voltage at point A in Figure 6.[1 mark]
  5. 6(b)(iii)Calculate the output voltage Vo in Figure 6.[2 marks]

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