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Transmission line of the driving gate is represented by load equal to characteristic impedence of the line Z0. What is the behaviour of following transmission line circuit when a pulse is applied to the transmission line?

F3 Vinanti Engineering 16.02.23 D5

This question was previously asked in
UGC NET Paper 2: Electronic Science 29 Oct 2022 Shift 1
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  1. Reflected pulse
  2. Undershoot
  3. Overshoot and ringing after several reflections
  4. Undershoot and ringing after five reflections

Answer (Detailed Solution Below)

Option 3 : Overshoot and ringing after several reflections
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Detailed Solution

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Concept:

The reflection coefficient describes how much of a wave is reflected by an impedance discontinuity. The reflection coefficient at the load end of the transmission line with characteristic impedance Z0 and load impedance ZL is given by

\(Γ = {Z_L-Z_0 \over Z_L + Z_0}\)

Analysis:

For an open-circuit transmission line, ZL = ∞ (infinite). Hence,

\(Γ = {1-{Z_0 \over Z_L} \over 1 + {Z_0 \over Z_L}} = 1\)

For the reflection coefficient Γ = 1, all of the incident wave is reflected back towards the source.

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