Two Zener diodes (A and B) having breakdown v | vedclass

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Question

(A) $1$. For $V_{	ext{in}} < 4\, V$: Neither Zener diode $A$ $(6\, V)$ nor $B$ $(4\, V)$ is in the breakdown region. Thus,the output voltage $V_{0}$

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Vedclass · Answer

(A) $1$. For $V_{	ext{in}} $2$. For $4\, V $3$. For $V_{	ext{in}} > 6\, V$: Zener diode $A$ also reaches its breakdown voltage of $6\, V$. Since $A$ is in parallel with the load,the output voltage $V_{0}$ is now clamped at $6\, V$. The excess voltage drops across the series resistance of the source or the circuit.$4$. Therefore,the graph of $V_{0}$ versus time will show a linear increase up to $4\, V$,a constant plateau at $4\, V$,and then a step increase to a constant plateau at $6\, V$.

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