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Question

Consider the diode circuit shown in the figure below:


The input output characteristic curve of the circuit can be represented as
(Assume cut-in voltage of diode D1 and D2 is equal to 0.7 V)



A
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B
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C
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D
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Solution

The correct option is A
Case I : For0.7 V<Vin<5.7~V
Both Diode D1 and D2 will be OFF and output will be equal to zero.

Case II : For Vin>5.7 V
Diode D2=ON and D1= OFF, thus the circuit can be redrawn as





thus, Vin=Vout+5.7 V, hence slope = 1 (for values of output voltages greater than 5.7 V)

Case III : When Vin<0.7 V
Then D1 will be ON and D2=OFF

Hence, the circuit will be redrawn as




hence, V0=Vin×120.7 V
Hence, Slope =12 and cut-off voltage =0.7 V

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