What Is The Symbol Of Varactor Diode?

What do you mean by varactor diode?

A Varactor Diode (also known with the names Varicap Diode, Varactor Diode, Tuning Diode) is a p-n junction diode which acts as a variable capacitor under varying reverse bias voltage across its terminals.

And because it is a diode that can behave as a variable capacitor, it is named as a Varactor Diode in short..

How does a varactor diode work?

A varactor diode is designed to store electric charge not to conduct electric current. So varactor diode should always be operated in reverse bias. When a reverse bias voltage is applied, the electrons from n-region and holes from p-region moves away from the junction.

What is the other name of Esaki diode?

A tunnel diode or Esaki diode is a type of semiconductor diode that has effectively “negative resistance” due to the quantum mechanical effect called tunneling.

What is varactor diode and its application?

Varactor or varicap diodes are used mainly in radio frequency or RF circuits to provide voltage controlled variable capacitance. These electronic componenta can be used in a whole variety of ways where a capacitance level needs to be controlled by a voltage.

What is the use of Schottky diode?

A Schottky diode is one type of electronic component, which is also known as a barrier diode. It is widely used in different applications like a mixer, in radio frequency applications, and as a rectifier in power applications. It’s a low voltage diode. The power drop is lower compared to the PN junction diodes.

What is the use of varactor diode in radio receiver?

In radio receivers, varactor diodes are used for So the diodes are used for tuning at the receivers. Varactor diodes operate when they are reverse-biased. Varactor diodes are often used in RF circuits. They are used in voltage controlled oscillators in a phase locked loop.

What is the difference between Schottky diode and normal diode?

Whereas in Schottky diode the junction is in between N type semiconductor to Metal plate. The schottky barrier diode has electrons as majority carriers on both sides of the junction. So it is a unipolar device. … In other words the forward voltage drop (Vf) is less compared to normal PN junction type diodes.

What is the difference between a Zener diode and a Schottky diode?

A Zener diode is made up of p-n junction but heavily doped compared to a normal diode. As a result, it can undergo break down without being damaged. And Due to this property only, Zener is used as a voltage regulator in electronic circuits. In fact, Zener diodes are never used for rectification purposes.

How does tunnel diode work?

What is a Tunnel Diode? Tunnel Diode is the P-N junction device that exhibits negative resistance. When the voltage is increased than the current flowing through it decreases. It works on the principle of the Tunneling effect.

How does a photo diode work?

A photodiode is a semiconductor device that converts light into an electrical current. The current is generated when photons are absorbed in the photodiode. Photodiodes may contain optical filters, built-in lenses, and may have large or small surface areas. … A photodiode is designed to operate in reverse bias.

Where is varactor diode used?

Varactor or varicap diodes are used mainly in radio frequency or RF circuits to provide voltage controlled variable capacitance. These electronic componenta can be used in a whole variety of ways where a capacitance level needs to be controlled by a voltage.

What is special about a diode?

Some semiconductor junctions, composed of special chemical combinations, emit radiant energy within the spectrum of visible light as the electrons change energy levels. Simply put, these junctions glow when forward biased. A diode intentionally designed to glow like a lamp is called a light-emitting diode, or LED.

What are the different types of diode?

Different Types of DiodesSmall Signal Diode. … Large Signal Diode. … Zener Diode. … Light Emitting Diode (LED) … Constant Current Diodes. … Schottky Diode. … Shockley Diode. … Step Recovery Diodes.More items…•

Who invented varactor diode?

The varicap was developed by the Pacific Semiconductor subsidiary of the Ramo Wooldridge Corporation who received a patent for the device in June 1961.

How do you identify a Schottky diode?

Connect the red positive test lead to the anode of the Schottky diode and the black common test lead to the cathode of the diode. Listen for a “beep” or a “buzz” from the multimeter. If the Schottky diode responds as expected, the multimeter will sound a tone.