What is a diode?

Diodes are used to protect circuits by using electrical power restrictions and converting AC to DC. Semiconductors such as silicon and germanium are used to make diodes. Or they transmit power in one way, and the way they transmit it is different. There are different types of diodes, and each type has its own system.

Types of diode

There are seven types of diode:

Light-emitting diode

While the electrical current between the electrodes passes through this diode, light is produced. In different clauses, light is produced while a sufficient amount of current transmission passes through it. On most diodes, the output of this light-emitting diode is invisible as it is the high-frequency range that does not allow it to be visible. LEDs should be in special colors. There are three-color LEDs that can emit three colors at a time. Light color depends on the power point-contact space of the semiconductor used.

Laser diode

It's far a different kind of diode because it produces coherent light as an electron-hole. It's far highly used in CD drives, DVDs, and laser devices. Those are costly when compared to LEDs and are cheaper while as compared to different laser generators. Limited existence is the only drawback of these diodes.

Varactor diode

Varactor diodes are semiconductor devices that are widely used in the electronics industry. They are also used within the RF design arena. In this article, we will learn about the characteristics and applications of the varactor diode.

Tunnel diode

A Tunnel diode is a heavily doped p-n junction diode in which the electric current decreases because the voltage will increase. In tunnel diode, electric current is because of “Tunneling”. The tunnel diode is used as a completely speedy switching tool in computer systems. It's also used in high-frequency oscillators and amplifiers.

Avalanche diode

This diode is a type of distortion and exploits the use of the avalanche effect. When power outages are normal and independent of the current, avalanche collapse occurs.

Zener diode

It is the most beneficial type of diode as it can provide a solid reference voltage. These are used in reverse bias and destructive when a certain voltage arrives. When the passage of the current in the resistor is limited, a strong voltage is generated. Zener diodes are widely used in power supplies to provide reference breakdown voltage.

The Zener diode works great as a normal diode whilst in forward-bias mode, and has an opening voltage of between 0.3 and 0.7 V. However, whilst related to the opposite mode, this is not unusual in most of its systems. A small-signal leak can be accompanied via a flow. As the reverse bias voltage-controlled will rise to a predetermined voltage (Vz), the charge-storage (current-limiting) begins evolved flowing into the diode. The current will rise sharply, that is determined via the series resistor, and then stabilize and continue to be unchanged over a wide variety of applied breakdown voltage.

Schottky diode

It has a lower forward voltage than other silicon P-N junction diodes. The drop will be visible where there may be low current flow and at that degree, voltage stages between 0.15 and 0.4 volts. These are constructed in a different way to be able to obtain that performance. Schottky diodes are highly used in rectifier programs. A diode is an electronic component with terminals that usually conducts energy to one side. A huge diode may have zero resistance on one aspect, and unlimited resistance within the contrary route. There are many types of diodes, specifically light-emitting diodes, Zener diodes, photodiodes, Schottky diodes, avalanche diodes, PN junction diodes, and much more. In this newsletter, let us research a little greater approximately Schottky-diode.

P-N junction diode

P-N junction diodes are also referred to as rectifier diodes. Those diodes are used for the repair method and are made from semiconductor substances. The P-N junction diode consists of two layers of semiconductors. One semiconductor layer is coated with P-type fabric and the other N-layer coating. The combination of both layers of P-type and N-type forms a junction known as a P-N junction. For this reason, the call P-N junction diode.


A photo-diode can perceive even a small quantity of current glide as a consequence of the light. Those are very helpful in the detection of light. That is an opposite bias diode and is used in solar cells and photometers. They're even used to generate power.

Characteristics of the diode

There are the following characteristics:

Forward-biased diode

There is a slight decrease in voltage across the entire diode while the diode is forward and the current is running. For silicon diodes, the forward voltage is 690mv and for germanium, 300mv is the forward voltage. Electrical capacity in all p-activity is good and, in all n-types, power can be negative.

Reverse-biased diode

The diode is said to prefer to reverse bias when battery power is completely lowered. For silicon diodes, the reverse voltage is - 20μa, and germanium, -50μa reverse voltage. Power can be present in everything p-type is negative and in everything n-type, positive energy is positive.

Zero-biased diode

The Schottky diode zero-bias detector is a type of RF power detector that does not require a bias voltage to operate. As a result, those devices can be used for large RF power receivers, or receivers, which do not require DC power while in listening mode.

What are the uses of diode

A diode may be the simplest of all semiconductor components, however, it performs many critical functions, including the control of the flow of an electrical current. Here’s a brief overview of the humble diode and what it is commonly used for.

A diode is a device that allows current flow in one direction but not the other. This is achieved through a built-in electric field. Although the earliest diodes consisted of red-hot wires running through the middle of a metal-semiconductor cylinder which itself was located inside of a glass vacuum tube, modern diodes are semiconductor diodes. As the name suggests, these are made from semiconductor materials, primarily doped silicon.

Common Mistakes

Diodes are very sensitive to temperature. Magnification is required for photodiode-based circuits. Light-emitting diodes are more expensive compared to other diodes. Some diodes such as the Schottky diode have a low voltage droppable voltage.

Context and Applications

In each of the expert exams for undergraduate and graduate publications, this topic is huge and is mainly used for:

  • Bachelor of technology in the electrical and electronic department
  • Bachelor of Science in physics
  • Master of Science in physics
  • Type of amplifier
  • Type of transistor
  • Type of transmitter

Practice Problems

Q1 Zener diodes are used for______.

(a) voltage regulation

(b) current regulation

(c) both

(d) none of these

Correct option- (a)

Explanation- Zener diodes are widely used as voltage regulation and as shunt controllers to control voltage across all small circuits.

Q2 A photodiode is a single type of ______.

(a) current detector

(b) light detector

(c) voltage detector

(d) none of these

Correct option- (b)

Explanation- A photodiode is a single type of light detector, used to convert light into current or voltage based on device operating mode.

Q3  diode are made of_________

(a) non- conducting

(b) insulating

(c) semiconducting

(d) electronic

Correct option- (c)

Explanation- Today, most diodes are made of semiconducting, but other materials such as gallium arsenide and germanium are also used.

Q4  diode is a _________device.

(a) non-liner

(b) unidirectional

(c) bidirectional

(d) none of these

Correct option- (b)

Explanation- A diode is called a unidirectional device, that is, a current flow in only one direction when a forward voltage is used, the diode operates again when a reverse voltage is used, with no conduction.

Q5  semiconductor diode is a  conducts_________ in one direction.

(a) voltage

(b) current

(c) power

(d) none of these

Correct option- (b)

Explanation- The semiconductor diode conducts current on one side. Two-channel device diodes that connect the P-N junction. The diode may be predominantly biased or reverse bias.

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