SEMI CONDUCTOR ELECTRONICS
Brief summary:
Semiconductor Basics
If resistors are the most basic passive component in electrical or electronic circuits, then we have to consider the Signal Diode as being the most basic active component.
However, unlike a resistor, a diode doesn't behave linearly with reference to the applied voltage because it has an exponential I-V relationship and thus can't be described simply by using Ohm’s law as we do for resistors.
Diodes are basic unidirectional semiconductor devices that will only allow current to flow through them in one direction only, acting more like a one way electrical valve, (Forward Biased Condition). But, before we've a glance at how signal or power diodes work we first got to understand the semiconductors basic construction and concept.
Diodes are made from a single piece of Semiconductor material which has a positive “P-region” at one end and a negative “N-region” at the other, and which has a resistivity value somewhere between that of a conductor and an insulator. But what is a “Semiconductor” material?, firstly let’s look at what makes something either a Conductor or an Insulator.
Resistivity
The electric resistance of an electrical or electronic component or device is usually defined as being the ratio of the voltage difference across it to the present flowing through it, basic Ohm´s Law principals. The problem with using resistance as a measurement is that it depends considerably on the physical size of the fabric being measured also because the material out of which it is made. For example, if we were to extend the length of the fabric (making it longer) its resistance would also increase proportionally.
Likewise, if we increased its diameter or size (making it thicker) its resistance value would decrease. So we want to be able to define the material in such a way as to indicate its ability to either conduct or oppose the flow of electrical current through it regardless of what its size or shape happens to be.
The quantity that's wont to indicate this specific resistance is named Resistivity and is given the Greek symbol of ρ, (Rho). Resistivity is measured in Ohm-metres, (Ω.m ). Resistivity is the inverse to conductivity.
If the resistivity of various materials is compared, they can be classified into three main groups, Conductors, Insulators and Semi-conductors
If resistors are the most basic passive component in electrical or electronic circuits, then we have to consider the Signal Diode as being the most basic active component.
However, unlike a resistor, a diode doesn't behave linearly with reference to the applied voltage because it has an exponential I-V relationship and thus can't be described simply by using Ohm’s law as we do for resistors.
Diodes are basic unidirectional semiconductor devices that will only allow current to flow through them in one direction only, acting more like a one way electrical valve, (Forward Biased Condition). But, before we've a glance at how signal or power diodes work we first got to understand the semiconductors basic construction and concept.
Diodes are made from a single piece of Semiconductor material which has a positive “P-region” at one end and a negative “N-region” at the other, and which has a resistivity value somewhere between that of a conductor and an insulator. But what is a “Semiconductor” material?, firstly let’s look at what makes something either a Conductor or an Insulator.
Resistivity
The electric resistance of an electrical or electronic component or device is usually defined as being the ratio of the voltage difference across it to the present flowing through it, basic Ohm´s Law principals. The problem with using resistance as a measurement is that it depends considerably on the physical size of the fabric being measured also because the material out of which it is made. For example, if we were to extend the length of the fabric (making it longer) its resistance would also increase proportionally.
Likewise, if we increased its diameter or size (making it thicker) its resistance value would decrease. So we want to be able to define the material in such a way as to indicate its ability to either conduct or oppose the flow of electrical current through it regardless of what its size or shape happens to be.
The quantity that's wont to indicate this specific resistance is named Resistivity and is given the Greek symbol of ρ, (Rho). Resistivity is measured in Ohm-metres, (Ω.m ). Resistivity is the inverse to conductivity.
If the resistivity of various materials is compared, they can be classified into three main groups, Conductors, Insulators and Semi-conductors
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