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5 marksOperational Amplifiers

CAPE Physics Unit 2 · 2001 · Paper 2 · Question 7(d)

Design an op-amp summing circuit to combine three signals V_1, V_2, and V_3 to produce V_0 = -V_1 - 4V_2 - 12V_3, such that the input resistance at the inputs is not less than 10 kΩ and all resistor values are less than 200 kΩ.

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Other parts of this question

  1. 7(a)Give THREE properties of an ideal operational amplifier.[3 marks]
  2. 7(b)For the non-inverting amplifier shown in Figure 4, show that the closed loop voltage gain, A, is given by A = 1 + R_f / R_i.[5 marks]
  3. 7(c)(i)Determine the closed loop gain.[1 mark]
  4. 7(c)(ii)When this circuit is used it saturates at ±13 V. If saturation is to be avoided, calculate the maximum input voltage that can be used.[2 marks]
  5. 7(c)(iii)Determine the output voltage for a sinusoidal signal of peak input voltage 3 V.[2 marks]
  6. 7(c)(iv)Sketch the resulting output signal when the peak input voltage is 3 V.[2 marks]

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