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4 marksOperational Amplifiers

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

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.

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.

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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)(iii)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.[5 marks]

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