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MOSFET Symbol

MOSFET stands for Metal Oxide Silicon Field Effect Transistor or Metal Oxide Semiconductor Field Effect Transistor. This is also called as IGFET meaning Insulated Gate Field Effect Transistor. The FET is operated in both depletion and enhancement modes of operation. The following figure shows how a practical MOSFET looks like. Construction of a MOSFET The construction of a MOSFET is a bit similar to the FET. An oxide layer is deposited on the substrate to which the gate terminal is connected. This oxide layer acts as an insulator (sio 2  insulates from the substrate), and hence the MOSFET has another name as IGFET. In the construction of MOSFET , a lightly doped substrate, is diffused with a heavily doped region. Depending upon the substrate used, they are called as  P-type  and  N-type   MOSFETs . The following figure shows the construction of a MOSFET . The voltage at gate controls the operation of the MOSFET . In this case, both positive and n...
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What is Electrical Switch

What is an Electrical Switch : An electrical switch is any device used to interrupt the flow of electrons in a circuit. Switches are essentially binary devices: they are either completely on (“closed”) or completely off (“open”). There are many different types of switches, and we will explore some of these types in this chapter. Learn the Different Types of Switches : Switches can be of mechanical or electronic type, Mechanical switches  must be activated physically, by moving, pressing, releasing, or touching its contacts. Electronic switches  do not require any physical contact in order to control a circuit. These are activated by semiconductor action. Mechanical Switches : Mechanical switches can be classified into different types based on several factors such as method of actuation (manual, limit and process switches), number of contacts (single contact and multi contact switches), number of poles and throws (SPST, DPDT, SPDT, etc.), operation and ...
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Thyristors Working

Thyristor Tutorial In many ways the Silicon Controlled Rectifier, SCR or just  Thyristor  as it is more commonly known, is similar in construction to the transistor. It is a multi-layer semiconductor device, hence the “silicon” part of its name. It requires a gate signal to turn it “ON”, the “controlled” part of the name and once “ON” it behaves like a rectifying diode, the “rectifier” part of the name. In fact the circuit symbol for the  thyristor  suggests that this device acts like a controlled rectifying diode. Thyristor Symbol However, unlike the junction diode which is a two layer ( P-N ) semiconductor device, or the commonly used bipolar transistor which is a three layer ( P-N-P, or N-P-N ) switching device, the  Thyristor  is a four layer ( P-N-P-N ) semiconductor device that contains three PN junctions in series, and is represented by the symbol as shown. Like the diode, the Thyristor is a unidirectional device, that is it ...
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