Question:

For the given circuit (shown in part A) the time dependent input voltage \(v_{in}(t)\) and corresponding output \(v_o(t)\) are shown in parts (B) and (C), respectively. Identify the components that are used in the circuit between \(X\) and \(Y\).}

Updated On: Apr 10, 2026
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The Correct Option is B

Solution and Explanation

Concept: The circuit in part (A) contains:
  • An ideal diode
  • A Zener diode with breakdown voltage \(V_Z=5\) V
The output waveform shows clipping at: \[ +5\,\text{V} \quad \text{and} \quad -5\,\text{V} \] Thus the circuit behaves like a bidirectional voltage limiter.
Step 1:Analyze positive half cycle} During positive input:
  • Zener diode reaches breakdown at \(+5\) V.
  • Output voltage is limited to \(+5\) V.

Step 2:Analyze negative half cycle} During negative input:
  • The other diode conducts normally.
  • Voltage is limited to \(-5\) V.

Step 3:Equivalent circuit} Such symmetrical clipping occurs when two diodes are connected in opposite directions between \(X\) and \(Y\). Thus the correct option corresponds to: \[ \boxed{\text{Two diodes in opposite directions}} \]
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