First slide

Application of p-n junction diode rectifier

Question

In the circuit given below, V(t) is the sinusoidal voltage source. Voltage drop $V_{AB}$ (t) across the resistance R

Moderate

A

is half wave rectified
B

is full wave rectified
C

has the same peak value in the positive and negative half cycles
D

has different peak values during positive and negative half cycles

Solution

In positive half cycle, diode $D_{2}$ is forward biased and diode $D_{1}$ is reverse biased. In negative half cycle, diode $D_{1}$ is forward biased and $D_{2}$ is reverse biased and direction of current is opposite through R for positive and negative half cycles. Hence, output is not rectified.
Since $R_{1}$ and $R_{2}$ are different, hence the peaks during positive half and negative half of the input signal will be different.

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