GATE EC 2014 Set 4 — Question 22
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Question
Two silicon diodes, with a forward voltage drop of 0.7 V, are used in the circuit shown in the figure. The range of input voltage for which the output voltage , is
Correct answer
(D) -1.7 V < Vᵢ < 2.7 V
Solution
For the output voltage to be equal to the input voltage , no current must flow through the resistor . This occurs when both diodes and are in the OFF state (reverse-biased or not sufficiently forward-biased).
1.Analysis of Diode : The anode is connected to a source and the cathode is connected to the output node . For to be OFF, the voltage across it must be less than the cut-in voltage :
2.Analysis of Diode : The anode is connected to the output node and the cathode is connected to a source. For to be OFF:
Combining these conditions, the diodes are OFF when . Since in this range, the range for is .Continue learning with Success Tracker
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