Question 59 of 209

In the given circuit the input voltage ${V}_{in}$ is shown in figure. The cut-in voltage of $p-n$ junction diode (${D}_{1}$ or ${D}_{2}$) is $0.6V$. Which of the following output voltage $\left({V}_{0}\right)$ waveform across the diode is correct?

ABCD

Show answer and solution▾

Answer: (D)

During the positive half cycle of the input waveform, diode ${D}_{1}$ is forward biased and diode ${D}_{2}$ is reverse biased. Here $0.6V$ appears across the output as the diode is conducting. During negative half cycle the diode ${D}_{1}$ is reverse biased and ${D}_{2}$ is forward biased, so, $-0.6V$ appears across the output as the diode is conducting in negative direction. This circuit can be used as a voltage limiter. This circuit will not allow any voltage above $0.6V$and below $-0.6V$.
Hence, the output waveform is