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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 V_i for which the output voltage Vₒ = V_i, is

1. -0.3 V < V_i < 1.3 V
2. -0.3 V < V_i < 2 V
3. -1.0 V < V_i < 2.0 V
4. -1.7 V < V_i < 2.7 V

Correct answer: -0.3 V < V_i < 1.3 V

Solution

The correct option is right because the two silicon diodes each have a forward voltage drop of 0.7 V, which means that for the output voltage to equal the input voltage, the input must be within the range that allows both diodes to conduct without exceeding their forward voltage drops.

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