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In the circuit shown below voltage Vin is -3V and VB is -1V. The resistor R1 and R2 are 1K. Assume both diodes are identical. Forward bias resistance is 10Ω. Cut-in voltage of diode is 0.7V. The voltage Vout is __________

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In the circuit shown below voltage Vin is -3V and VB is -1V. The resistor R1 and R2 are 1K. Assume both diodes are identical. Forward bias resistance is 10Ω. Cut-in voltage of diode is 0.7V. The voltage Vout is __________

(a) -2V

(b) -3V

(c) -1V

(d) -.0.7V

I had been asked this question in an international level competition.

Question is taken from Piecewise Linear Model of Diode-2 in chapter Diode Circuit of Analog Circuits

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Right answer is (b) -3V

Easy explanation: Since both diodes are in reverse bias mode applied voltage Vin will appear on Vout. Diode D1 and D2 disappears and leaves the terminal as open.

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