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GATE 2014 EC (EC2) – Question 47

Analog Circuits · Diode Circuits · 2 marks · Multiple choice

The diode shown has V_on = 0.7 V and is otherwise ideal. If Vi = 5 sin(ωt) V, find minimum and maximum Vo (V), respectively.

Diagram for GATE 2014 EC (EC2) question 47
  1. −5 and 2.7
  2. 2.7 and 5
  3. −5 and 3.85
  4. 1.3 and 5

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Show answer and explanation

Correct answer: (C) −5 and 3.85

Explanation

The diode begins conducting when the output exceeds2+0.7=2.7V. Below that threshold the branch is open, so vo=vi and the minimum is−5V. At vi=5V the diode is on and equal1kΩ resistors divide between5V and2.7V, giving vo=(5+2.7)/2=3.85V. Thus **−5V,3.85V,C**.