# Physics questions: amplifiers

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A small voltage amplifier has the transfer characteristic shown below. VOUT VIN 1 Calculate the linear gain of the amplifier (magnitude and sign) and state whether this amplifier is inverting or non-inverting. Formula and calculation required. (2 marks) Linear Gain Mag Sign Inverting / Noninverting A 2.0Vp-p (1.0V) AC input signal is applied to the amplifier as shown below. V Input signal (Volts) 5 4 3 2 1 – 1 3 6 9 t (s) time (ms) – 2 – 3 – 4 – 5 2 On the graph above draw the output AC signal. marks) (2 Questions 3-7 refer to the following information. A voltage amplifier is used to amplifythe AC signal input voltage from a microphone. The amplifier characteristics are shown in the figure below 3 Is this amplifier an inverting amplifier or a non-inverting amplifier? What is the voltage gain of this amplifier? (2 marks) Inverting / Non inverting 4 Voltage Gain What isthe range of input voltage so there would be no clipping? Min: V Max: (2 marks) V 5 What is the output voltage when the input voltage is 0.03V? (1 marks) V A 0.04Vp-p (0.02V) AC input signalVINis now applied to the amplifier as shown below. VIN (V) 0.02 2 4 6 8 t (ms) −0.02 6 On the axes below sketch the AC output signal Output voltage graph + clearly numbered axes marks) (3 Vout (V) 2 4 6 8 t (ms) A 0.08Vp-p (0.04V) AC input signalVINis now applied to the amplifier as shown below. VIN (V) 0.04 2 6 4 8 t (ms) −0.04 7 On the axes below sketch the AC output signal Complete Graph. Clearly numbered Y-axis (4 marks) VOUT (V) 2 4 6 8 t (ms) 8 9 What is attenuation? Explanation required (2 marks) Describe the skin effect in copper wires and explain why it occurs? Explanation required (3 marks) 10 Explain why the light signals in optical fibres are not affected by the skin effect? Explanation required (2 marks) 11 Compare the information-carrying capacity of copper wires and optical fibres? Explanation required (2 marks)
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