Two Zener diodes (A and B) having breakdown voltages of 6 V and 4 V respe4ctively, are connected as shown in the circuit below. The output voltage $\mathrm{V}_{0}$ variation wlith input voltage linearly increasing with time, is given by: ( $\mathrm{V}_{\text {input }}=0$ V at $\mathrm{t}=0$ ) (figures are qualitative)

Semiconductors — JEE Main · 2020 · 05 Sep 2020 · Shift 2 Question with Solution

Two Zener diodes (A and B) having breakdown voltages of 6 V and 4 V respe4ctively, are connected as shown in the circuit below. The output voltage

V_{0}

variation wlith input voltage linearly increasing with time, is given by: (

V_{input} = 0

V at

t = 0

)

(figures are qualitative)

(A)(see structure)
✓ Correct
(B)(see structure)
(C)(see structure)
(D)(see structure)

Answer: (A)

Solution

While the input stays below

4

V neither diode has reached breakdown, so the output simply follows the input and climbs linearly. Once the input reaches

4

V the lower-voltage Zener breaks down; between

4

V and

6

V it conducts while the current grows through the series resistance, so the output keeps rising but along a gentler slope rather than holding perfectly flat. When the input passes

6

V the second Zener also conducts and the output settles to a steady clamped level. The correct response is the one that rises straight to

4

V, rises more shallowly from

4

V to

6

V, and saturates beyond

6

JEE Main · 2020 · 05 Sep 2020 · Shift 2 · Single correct option

JEE Main · 2020 · 05 Sep 2020 · Shift 2 · Semiconductors

Solution

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