Full Time - Table 2022 - 23




 

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Tunnel Diode

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Tunnel Diode Definition:  The tunnel diode is a highly conductive, heavily doped PN-junction diode in which the current induces because of the tunnelling. Tunnelling is the phenomenon of conduction in the semiconductor material in which the charge carrier punches the barrier instead of climbing through it. The tunnel diode is a heavily doped PN-junction diode. The concentration of impurity in the normal PN-junction diode is about 1 part in 10 8 . And in the tunnel diode, the concentration of the impurity is about 1 part in 10 3 . Because of the heavy doping, the diode conducts current both in the forward as well as in the reverse direction. It is a fast switching device; thereby it is used in high-frequency oscillators, computers and amplifiers. Symbol of Tunnel Diode The symbol of tunnel diode is shown in the figure below. The cathode and anode are the two terminals of semiconductor material. The p-type material attracts the electrons and hence it is called ano...
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Full Wave Rectifier

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Full Wave Rectifier In  Full Wave Rectification , when the AC supply is applied at the input, during both the half-cycles (i.e., positive as well as negative) current flows through the load in the same direction. This can be achieved by using two crystal diodes. The two diodes conduct the current alternately. To obtain the same direction of flow of current in the load resistors R L  during positive as well as the negative half cycle of input, the two circuits are used. They are named as follows:- Center tapped full wave rectifier Full Wave Bridge Rectifier To have detailed explanation on the two types of full wave rectifiers follow the links given above. Center Tapped Full Wave Rectifier The  Center Tapped Full Wave Rectifier  employs a transformer with the secondary winding AB tapped at the centre point C. It converts the AC input voltage into DC voltage. The two diode D 1 , and D 2  are connected in the circuit as shown in the circuit diagram below. Each diode...
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Light Emitting Diode (LED)

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Light Emitting Diode (LED) Definition:  The LED is a PN-junction diode which emits light when an electric current passes through it in the forward direction. In the LED, the recombination of the charge carrier takes place. The electron from the N-side and the hole from the P-side are combined and gives energy in the form of heat and light. The LED is made of semiconductor material which is colourless, and the light is radiated through the junction of the diode. The LEDs are extensively used in segmental and dot matrix displays of numeric and alphanumeric characters. Several LEDs are used for making the single line segment while for making the decimal point single LED is used. Construction of LED The recombination of the charge carrier occurs in the P-type material, and hence P-material is the surface of the LED. For the maximum emission of light, the anode is deposited at the edge of the P-type material. The cathode is made of gold film, and it is usua...
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