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5 marksOperational Amplifiers

CAPE Physics Unit 2 · 2003 · Paper 2 · Question 6(c)

Summing amplifier circuit design.

Three signals V_1, V_2 and V_3 are to be combined to produce an output V_o = -3V_1 - V_2 - 5V_3. The input resistance of the inputs must NOT be less than 10 kOmega and all resistor values must be less than 200 kOmega. Design a circuit to achieve this objective.

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Other parts of this question

  1. 6(a)(i)State THREE characteristics of the ideal operational amplifier and their implications for the ideal operational amplifier.[6 marks]
  2. 6(a)(ii)What effect does negative feedback have on the gain and bandwidth of an operational amplifier?[2 marks]
  3. 6(b)(i)Determine the output voltage, V_o, of the circuit.[3 marks]
  4. 6(b)(ii)Suggest a practical use for circuit B.[1 mark]
  5. 6(b)(iii)The entire circuit in Figure 6 saturates at +- 13 V. What is the maximum input voltage that will NOT saturate this circuit?[3 marks]

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