Energy Band Theory of Crystals: Energy Band Theory of Crystals - As discussed above, it is revealed that most metals and semiconductors are crystalline in structure and a crystal is made up of a space…
What is Crystalline Structure? What is Crystalline Structure? - Solids are characterized by incompressibility, rigidity and mechanical strength. This indicates that the molecules, atoms or ions that make up a solid are closely packed, i.e.,…
Compound Semiconductor Materials: Most of the compound semiconductor materials are formed from the combinations of group III and group V elements. A portion of the periodic table listing the more common semiconductors is given in…
Elemental Semiconductor Materials: Group IV includes five elements viz., Carbon (C), Silicon (Si), Germanium (Ge), Tin (Sn) and lead (Pb). The elements of this subgroup show marked similarity as well as gradation in properties with…
Thyratron Working Principle: Thyratron is a hot cathode gas filled triode. Normally it is filled with a small amount of inert gas such as argon, hydrogen, neon or mercury vapour. The fast acting devices do…
Construction of Phanotron: The constriction of a gas-filled diode or phanotron is similar to a vacuum diode except that the size of its electrodes is larger so as to conduct heavy currents. As far as…
Cold Cathode Gas Filled Diode: The cutaway view of a Cold Cathode Gas Filled Diode is shown in Fig. 5.24. It essentially consists of two electrodes, namely cathode and anode, mounted fairly close together in…
Explain Conduction in Gas: Explain Conduction in Gas - The introduction of small amount of gas into the electron evacuated tubes entirely changes the operating characteristics—materially giving in general a greatly diminished voltage drop and…
Classification of Gas Filled Tubes: Vacuum tubes are no doubt, extensively used in communication control and industrial electronic circuits, but these can carry small plate currents (typically from 1 mA to 100 mA). For certain…
Construction and Working of Vacuum Pentode: In order to retain the advantages of screen grid and eliminate the harmful effects of attracting the electrons due to secondary emission by the screen grid, an additional third…
