GATE 2026 EC – Question 65
Consider the ideal diodes D1 and D2 as shown in the Figure with cut-in voltage $V_\gamma=0$ Volt and $v_i(t)$ is in Volt. The maximum voltage (Volt) of the output $v_o(t)$ is ________. (rounded off to two decimal places)
Practise this question in The GATE Grind →
Show answer and explanation
Correct answer: 3.98 to 4.02
Explanation
Battery polarity from the symbols: the long (positive) plate of the 2 V battery is on top, so D1 conducts once $v_o$ exceeds 2 V; the 4 V battery has its positive plate at ground, so D2 conducts only when $v_o<-4$ V. For $v_i>2$ V, D1 is on and $(v_i-v_o)/10 ext{k}=(v_o-2)/10 ext{k}$, so $v_o=(v_i+2)/2$. At the peak $v_i=6$ V the output maximum is $(6+2)/2=4.00$ V.