S. L. Arora Solutions for Chapter: Semiconductor Devices and Digital Circuits, Exercise 3: Problems For Practice

Find the current through the circuit and the potential difference across the diode shown in figure. The drift current for the diode is $20 \mathrm{\mu A}$.

Find the equivalent resistance of the circuit shown in figure between points $\mathrm{A}$ and $\mathrm{B}$, for

Assuming that the resistances of the meters are negligible, what will be the readings of the ammeters ${\mathrm{A}}_1$ and ${\mathrm{A}}_2$ in the circuit shown in figure?

A potential barrier of $0.60 \mathrm{V}$ exists across a $\mathrm{p}$- $\mathrm{n}$ junction. (i) If the depletion region is $6.0\times {10}^{-7} \mathrm{m}$ thick, what is the intensity of the electric field in this region? (ii) If an electron with speed $5.0\times {10}^5 \mathrm{m}{\mathrm{s}}^{-1}$ approaches the $\mathrm{p}$-$\mathrm{n}$ junction from the $\mathrm{n}$-side, with what speed will it enter the $\mathrm{p}$-side? Mass of electron, $m=9.1\times {10}^{-31} \mathrm{kg}$, charge of the electron, $e = 1.6\times {10}^{-19}$

A sinusoidal voltage of rms value $220 \mathrm{V}$ is applied to a diode and a resistor $\mathrm{R}$ in the circuit shown in figure, so that half-wave rectification occurs. If the diode is ideal, what is the rms voltage across $\mathrm{R}$?

The applied input A.C to a half-wave rectifier is $100 \mathrm{W}.$ The D.C output is $40 \mathrm{W}$. (i) What is the rectification efficiency? (ii) What is the power efficiency?

A crystal diode having internal resistance $200 \mathrm{\Omega }$ is used as a half rectifier. If the applied voltage is $V=50$$\mathrm{s}\mathrm{i}\mathrm{n}\mathrm{}\mathrm{\omega }\mathrm{t}$ volt and load resistance is $800 \mathrm{\Omega }$, find (i) maximum output current (ii) d. c. output current (iii) d. c. output power and (iv) d. c. output voltage.

In a photodiode, the conductivity increases when the material is exposed to light. It is found that conductivity changes only if the wavelength is less than $600 \mathrm{n}\mathrm{m}.$ What is the band gap?  $h = 6.6\times {10}^{-34} \mathrm{Js}, c = 3\times {10}^8 \mathrm{m}/\mathrm{s}$