Input and output from a common-base amplifier are fed to an oscilloscope to see their phase relationship. The Lissajous figure is: 

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  1. an oblique ellipse
  2. a circle
  3. a straight line
  4. an ellipse

Answer (Detailed Solution Below)

Option 3 : a straight line
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The correct answer is option 3.

Explanation

The Lissajous figure obtained for different angles of phase shit is given below:

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Common-base amplifier

F1 Madhuri Engineering 10.02.2023 D1

For the common base configuration to operate as an amplifier, the input signal is applied to the emitter terminal and the output is taken from the collector terminal. 

In a common-base amplifier, the phase difference between input and output is 0°.

Hence, the Lissajous figure would be a straight line.

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