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In the circuit shown below voltage Vin is -3V and VB is -2V. The resistor R is 1K. Cut-in voltage of diode is 0.7V. Forward bias resistance is 10Ω. The voltage V is __________(a) -0.29V(b) -4.25V(c) 4.25V(d) 2.9VI had been asked this question during an online exam.I want to ask this question from Piecewise Linear Model of Diode-2 in chapter Diode Circuit of Analog Circuits

Answer»

The correct CHOICE is (b) -4.25V

For explanation I WOULD say: Effective voltage ACROSS diode is one volt. Hence diode is in forward bias MODE. So we can apply equivalent circuit of diode.

Net voltage through R and RD is -3-2+0.7 = -4.3V

Current through the circuit is -4.3/(R+RD) = -4.3/(1010) = -0.00425A=-4.25 mA

Hence voltage across R is 1Kx(-4.25mA) = -4.25V.


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