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5 marksOperational Amplifiers

CAPE Physics Unit 2 · 2017 · Paper 2 · Question 2(b)(iii)

In an experiment to determine the frequency response of an open-loop op-amp, a constant sinusoidal input voltage of amplitude 0.1 mV is applied while measuring output voltage amplitude at various frequencies.

From the graph, determine the frequency response curve and hence find the bandwidth of the circuit when R_2 = 100 kΩ and R_1 = 330 Ω.

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Other parts of this question

  1. 2(a)(i)Identify the type of op-amp circuit shown in Figure 2.[1 mark]
  2. 2(a)(ii)State the equation for the closed loop gain, A_CL (V_out / V_in), of the circuit.[1 mark]
  3. 2(b)(i)Complete Columns 3, 4, and 5 of Table 2, given that A_OL is the open-loop gain of the amplifier.[4 marks]
  4. 2(b)(ii)On the grid provided in Figure 3, plot a graph of log₁₀ A_OL versus log₁₀ f, and draw a smooth curve through the points.[4 marks]

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