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4 marksOperational Amplifiers

CAPE Physics Unit 2 · 2010 · Paper 2 · Question 5(c)

In a certain application, it is desired to combine two signals, v₁ and v₂, to form a signal v₀ according to the relation v₀ = -2 v₁ - 5 v₂. The minimum input resistance for both signal inputs should be NO less than 10.0 kΩ. Design a circuit to meet this requirement.

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  1. 5(a)Show that the closed loop gain, A, of the non-inverting operational amplifier circuit in Figure 4 is given by A = (R_i + R_f) / R_i. Clearly state any…[5 marks]
  2. 5(b)(i)What is the value of the output voltage when V_i = +250 mV?[1 mark]
  3. 5(b)(ii)If the op-amp is NOT to be saturated, what is the MAXIMUM voltage amplitude for the input signal?[2 marks]
  4. 5(b)(iii)Sketch a graph to show the expected output when a sinusoidal signal with an amplitude of 0.75 V is applied to the input of this amplifier.[3 marks]

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