NPN Transistor

Definition: NPN transistor is a type of bipolar transistor that has 3 layers and is used for signal amplification. It is a current controlled device. NPN is an abbreviation used for a negative positive negative transistor. This means a p-type semiconductor is fused between 2 n-type semiconductor material. It has 3 regions namely emitter, base …

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Light Emitting Diode (LED)

Definition: LED is a PN junction diode, that emits light when a certain potential is provided to the diode. LED is the short form for Light Emitting Diode and is a forward biased device. This means it operates only when a forward voltage is applied to it. It is a semiconductor device whose operating principle …

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Varactor Diode

Definition: Varactor Diode is a PN junction diode that is especially operated in reverse biased mode. It is a device whose capacitance varies with the variation in the applied reverse bias potential. It is also known as varicap or voltcap. The word varicap is derived from the combination of word variable and capacitor. As these …

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PIN Diode

Definition: A PIN diode is an advancement of normal PN junction diode. It is a 3-layer device in which an intrinsic layer i.e., undoped semiconductor is sandwiched between P and N regions. Thus, making it a PIN diode. The presence of intrinsic region exhibits high resistance property. Due to this, the magnitude of the electric …

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Tunnel Diode

Definition: A heavily doped two-terminal semiconductor device through which electric current flows because of tunneling ( or tunnelling) of electrons is known as Tunnel Diode. It possesses the negative resistance characteristic in which current decreases even when the applied voltage is increased. Tunneling basically denotes the penetration of electrons through the depletion region. As highly …

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Zener Diode

Definition: A special type of PN junction diode that operates in reverse biased mode, more specifically in breakdown region is known as Zener Diode. The doping level of the zener diode is somewhat higher than the normal PN junction diode. So that it can give a sharp breakdown voltage. Zener breakdown was first noticed and …

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Diode

Definition: An electronic component made of semiconductor material that allows conduction of current in only one direction is termed as a Diode. It is a two-terminal device normally formed by fusing p and n-type semiconductor materials each having majority and minority carriers. Let us first see the major contents of this article. Content: Diode Symbol …

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