How is a varactor diode different from a normal diode?
As nouns the difference between diode and varactor is that diode is an electronic device that allows current to flow in one direction only; a valve while varactor is (electronics) a solid-state diode whose capacitance varies with the applied voltage.
Why normal diode Cannot be used as voltage regulator?
To make things very simple, a normal rectifier diode has a rather high reverse breakdown voltage (anywhere between 50 to a 1000 V), which is not practical for a voltage regulator. Also, normal diodes are simply not designed to be used in reverse biased mode.
What is the difference between a normal diode and a Zener diode?
A diode is a semiconductor device which conducts in one direction only. A Zener diode is a semiconductor device which conducts in forward biased as well as reversed biased. A normal diode if operated in reversed biased will get destroyed.
Why the varactor diode is called tuning diode?
Varactor diode or varicap diode is a semiconductor diode that changes its junction capacitance significantly with respect to applied reverse bias voltage. These diodes are useful in RF circuits for tuning signals. That is why, a class of varactor diodes are also called Tuner diodes.
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.
How does a varactor diode?
A varactor diode is a p-n-junction diode, in which internal capacitance can be altered as a result of the application of reverse bias voltage. The varactor diode works in the reverse bias condition. It is also known as Varicap diode or voltCap diode indicating varying capacitance.
In which bias a normal diode can work?
In a standard diode, forward biasing occurs when the voltage across a diode permits the natural flow of current, whereas reverse biasing denotes a voltage across the diode in the opposite direction.
Can a normal pn junction diode be used as voltage regulator?
Zener diode is a silicon semiconductor with a p-n junction that is specifically designed to work in the reverse biased condition. Due to this feature, it is used as a voltage regulator in d.c. circuit. …
What is meant by varactor diode?
A varactor diode is a p-n-junction diode, in which internal capacitance can be altered as a result of the application of reverse bias voltage. It is also known as Varicap diode or voltCap diode indicating varying capacitance.
What is a normal diode?
The normal diode is a semiconductor device, where the reverse current through the device in the micro-ampere (μA) range is very low. The normal diode is damaged when operated in reverse biased condition. It conducts only in one direction. To know in detail about the PN junction, subscribe BYJU’S – The Learning App.
Why is varactor diode used?
What is a varactor diode used for?
A varactor diode is a simple variable capacitor that allows oscillator circuits and other circuits to be easily tuned by applying a voltage. These diodes have a similar structure as a p-n diode; the structure of a varactor diode is rather simple and illustrates its power as a component with nonlinear reactance.
What is the biasing of a varactor diode?
In forward bias, the diode allows the current to flow through it. During reverse bias, it blocks the flow of current. This reverse biasing is used in the case of the varactor diode. Based on the characteristics of voltage and current and the requirement the diodes are classified as Tunnel diode, Zener diode, and so on. What is a Varactor Diode?
What is a voltage-dependent diode?
The voltage-dependent device means the output of the diode depends on their input voltage. T he varactor diode is used in a place where the variable capacitance is required, and that capacitance is controlled with the help of the voltage. The Varactor diode is also known as the Varicap, Voltcap, Voltage variable capacitance or Tunning diode.
How do you change the capacitance of a varactor diode?
Therefore by changing the reverse bias on the diode it is possible to change the capacitance. The varactor diode has a non-linear capacitance curve – the capacitance of the varactor diode is inversely proportional to the square root of the voltage across it.
What is the function of a varicap diode?
The varicap diode or varactor diode provides a way or having a voltage controlled variable capacitance in a circuit. Varactor or varicap diodes are used mainly in radio frequency or RF circuits to provide voltage controlled variable capacitance.