Full Time - Table 2022 - 23




 

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Varactor Diode

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  Varactor Diode Definition:  The diode whose internal capacitance varies with the variation of the reverse voltage such type of diode is known as the Varactor diode. It is used for storing the charge. The varactor diode always works in reverse bias, and it is a voltage-dependent semiconductor device The voltage-dependent device means the output of the diode depends on the input voltage. T he varactor diode is used in a place where the variable capacitance is required, and that capacitance is controlled with the help of the voltage.  The Varactor diode is also known as the Varicap, Voltcap, Voltage variable capacitance or Tunning diode. Symbol of Varactor Diode The symbol of the varactor diode is similar to that of the PN-junction diode. The diode has two terminals namely anode and cathode. The one end of a symbol consists the diode, and their other end has two parallel lines that represent the conductive plates of the capacitor. ...
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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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