SCR-Silicon Controlled Rectifier

jojo September 18, 2009 2 Comments
Introduction to SCR-Silicon Controlled Rectifier As the terminology indicates, the SCR is a controlled rectifier constructed of a silicon semiconductor material with a third terminal for control purposes. Silicon was chosen because of its high temperature and power capabilities....
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Thyristor vs Transistor

jojo September 10, 2009 2 Comments
Comparison of  Thyristor and Transistor As already mentioned, transistors and thyristors are both semiconductor devices. They are now widely employed in switching operations because of their numerous advantages such as noiseless operation owing to absence of moving parts, very...
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Thyristor vs Thyratrons

jojo September 10, 2009 1 Comment
Comparison between Thyristors and Thyratrons Before the discovery of thyristors, thyratrons were used for industrial control, but now they have been replaced by the thyristors because of the following drawbacks of thyratrons. 1. Thyratron needs a large anode-to-cathode voltage...
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Types of Thyristors

jojo September 10, 2009 3 Comments
Thyristor Family-Types of Thyristors The P-N-P-N devices with zero, one or two gates constitute the basic thyristor. But today the thyristor family includes other similar multilayer devices also. The complete list of thyristor family members include diac (bidirectional diode...
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Thyristors

jojo September 18, 2009 3 Comments
General Introduction to Thyristors and its Applications Thyristor is the general name given to a family of semiconductor devices having four layers with a control mechanism, although this term is most commonly applied to the SCR (silicon-controlled rectifier). This...
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JFET and MOSFET comparison

jojo September 8, 2009 12 Comments
JFETs and MOSFETs are quite similar in their operating principles and in their electrical characteristics. However, they differ in some aspects, as detailed below : JFETs can only be operated in the depletion mode whereas MOSFETs can be operated...
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IGBT-Insulated Gate Bipolar Transistors

jojo September 8, 2009 5 Comments
Introduction to IGBT-Insulated Gate Bipolar Transistors Insulated gate bipolar transistor (IGBT) is a new high conductance MOS gate-controlled power switch. The fabrication process is similar to that of an N-channel power MOSFET but employs an N-epitaxial layer grown on...
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How to protect mosfet devices

jojo September 8, 2009 4 Comments
MOSFET requires very careful handling particularly when out of circuit. In circuit a MOSFET is as rugged as any other solid-state device of similar construction and size. MOSFETs have an ultra-thin silicon dioxide layer between the channel and the...
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CMOS-Complimentary Mosfet

jojo September 7, 2009 1 Comment
Introduction to CMOS-Complimentary Metal Oxide Semiconductor FET’s Complementary metal oxide semi-conductor devices are chips in which both P-channel and N-channel enhancement MOSFETs are connected in push-pull arrangement. The basic connections for CMOS are shown in figure. Above figure shows various...
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