Explain the working of reverse biased p - n junction diode with the help of circuit diagram. How is it used in Zener diode?

When the Zener diode is reverse biased the junction potential increases. As the breakdown voltage is high this will provide high voltage handling capacity. As the reverse voltage is increased, the reverse current increases drastically at a certain reverse voltage. Reverse-biased p - n junction diode A p - n junction diode is said to be reverse biased when the positive terminal of a cell or battery is connected to the n - side of the junction and the negative terminal to the p - side. When reverse biased, the depletion region widens and the potential barrier is increased. The polarity of the battery extracts the majority charge carriers of each region. The holes in the p - region from the electrons injected into the p - region from the negative terminal of the battery. The electrons in the n-region go to the positive terminal of the battery. This way, the majority charge carrier concentration in each region decreases against the equilibrium values and the reverse biased junction diode has a high resistance. Thus, the diffusion current across the junction becomes zero. Thus, the diode does not conduct when reverse biased and is said to be in a quiescent or non-conducting state i.e., it acts as an open switch.

Identify the equivalent gate and write its name in the circuit shown in the figure. Prepare the truth table of the gate and write its Boolean expression.

Truth Table : A B Y 1 Y 2 Y 1 + Y 2 Y 0 1 1 0 1 0 1 0 0 1 1 0 0 0 1 1 1 0 1 1 0 0 0 1 The equivalent gate is AND gate.Boolean Expression Q = A . B The AND gate is so named because, if 0 is called "false" and 1 is called "true," the gate acts in the same way as the logical "and" operator. The output is "true" when both inputs are "true." Otherwise, the output is "false." In other words, the output is 1 only when both inputs one AND two are 1 .

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What is the principle of a photo-diode ?

Important Questions on Semiconductor Electronics: Materials, Devices and Simple Circuits

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 14 - Semiconductor Electronics: Materials, Devices and Simple Circuits>Uttar Pradesh Board-2020>Q 5

How is AND gate obtained by NOR gate ?

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 14 - Semiconductor Electronics: Materials, Devices and Simple Circuits>Uttar Pradesh Board-2020>Q 6

How is OR gate obtained by NOR gate ?

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 14 - Semiconductor Electronics: Materials, Devices and Simple Circuits>Uttar Pradesh Board-2020>Q 7

An ac voltage of peak value $30 V$ , is connected in series with a germanium diode and a load resistor of $400 Ω$ . The forward resistance of the diode is $20 Ω$ and the barrier voltage is $0.3 V$ . Find the peak current through the diode and peak voltage across the load. What will happen to these values, if the diode is assumed to be ideal ?