Construction of Varactor Diode
The construction of a varactor diode is similar to a regular p-n junction diode, with some additional characteristics. These are added to ensure it shows characteristics of variable capacitance.
The integral part of Varactor diodes is typically made from semiconductor materials like silicon (Si) or gallium arsenide (GaAs). Silicon varactors are commonly used because they have a lower capacitance range.
A varactor diode typically consists of a p-n junction. P-N junctions are created by adding impurities to semiconductor wafer (doping). The p-type region contains holes ( i.e positively charged carriers) and the n-type region contains electrons(negatively charged carriers).
The p-n junction creates a depletion region at the boundary between the p-type and n-type regions. The width of this region depends on the kind of biasing technique used in the diode. When forward bias is applied this depletion region will be narrow and when reverse bias is applied the depletion region will be wide blocking most current flow
We also have metal contacts added to the p-type and n-type regions to provide electrical connections. These contacts allow you to apply an external voltage across the diode.
Varactor Diode
In this article, we will be discussing about varactor diode. We will also discuss its symbol, construction, its working, and its application in various tuning circuits. In addition to this, we will discuss the characteristic curve of this diode. Later in the article, we will discuss the advantages and disadvantages and Applications of using a varactor diode.
Table of Content
- What is a Varactor Diode?
- Construction
- Working of Varactor diode
- Varactor Diode in Tuning Circuit
- Characteristic Curve of Varactor Diode
- Application of Varactor Diode
- Advantages
- Disadvantages
Contact Us