Welcome to the Diodes!
A diode is a two-terminal electronic component that conducts current primarily in one direction (so long as it is operated within a specified voltage level). In other words, a diode is effectively like a valve for an electrical circuit.
They all have unique characteristics which define how they actually operate, such as current-voltage relationship (includes forward bias, reverse bias and breakdown), forward voltage, breakdown voltage and so on.
An ideal diode will have zero resistance in one direction, and infinite resistance in the reverse direction. Although in the real world, diode’s can not achieve zero or infinite resistance. Instead, a diode will have negligible resistance in one direction (to allow current flow), and a very high resistance in the reverse direction (to prevent current flow).
There are a lot of different diode types, and semiconductor diodes are the most common type of diode. The most common used are normal diodes (such as standard signal diodes), power diodes, light-emitting diodes (LEDs), Schottky diodes, Zener diodes, photodiodes and so on.
Diodes have a huge range of uses. It is usual to find a diode of some type in just about every circuit. They could be featured in anything from a small-signal digital logic to a high voltage power conversion circuit.
The application areas of diodes include communication systems as limiters, clippers, gates; computer systems as logic gates, clampers; power supply systems as rectifiers and inverters; television systems as phase detectors, limiters, clampers; radar circuits as gain control circuits, parameter amplifiers, etc.
The process of circuit design can cover systems ranging from complex electronic systems all the way down to the individual diodes within an integrated circuit.
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