First slide

Diodes

Question

Both the diodes used in the circuit shown are assumed to be ideal and have negligible resistance when these are forward biased. Built in potential in each diode is 0.7 V. For the input voltages shown in the figure, the voltage (in Volts) at point A is ___-

Easy

Solution

$L e t s a y p o t e n t i a l o f p o i n t B = V_{B} = 0 ∴ V_{i n =} V_{C} - V_{B} = 12.7 (g i v e n)$
$\Rightarrow V_{C} - 0 = 12.7 \Rightarrow V_{C} = 12.7 V$
$N o w, b u i l t i n p o t e n t i a l o f d i o d e = V_{C} - V_{A} = 0.7 [g i v e n]$
$\Rightarrow 12.7 - V_{A} = 0.7 \Rightarrow V_{A} = 12 V$

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