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4 marksOperational Amplifiers

CAPE Physics Unit 2 · 2006 · Paper 1 · Question 4(b)

Summing amplifier circuit design.

Design a circuit using an operational amplifier and resistors with values between 15 kΩ and 200 kΩ to combine three signals V_1, V_2, and V_3 to yield V_out = -2V_1 - 8V_2 - V_3.

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Other parts of this question

  1. 4(a)(i)Write the formula for the gain of amplifier A and amplifier B.[2 marks]
  2. 4(a)(ii)Mark with an X any point or points on the circuit diagram that act as a virtual earth.[1 mark]
  3. 4(a)(iii)If the input voltage is 0.3 V, determine the output voltage V_out.[3 marks]

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