What is abrupt varactor diode?

Abrupt varactor diodes are the more commonly used form of varactor. As the abruptness of the junction is governed by the doping concentration and also the profile, this is controlled during the manufacture.

What is hyper abrupt junction?

Hyperabrupt. In a hyperabrupt junction, the carrier concentration in the cathode layer is rapidly reduced as the distance from the junction increases.

What is the symbol of varactor diode?

The symbol of the varactor diode is similar to that of the PN-junction diode. The diode has two terminals namely anode and cathode. The one end of a symbol consists the diode, and their other end has two parallel lines that represent the conductive plates of the capacitor.

What is a Varicap diode used for?

Tuning circuits. Generally the use of a varicap diode in a circuit requires connecting it to a tuned circuit, usually in parallel with any existing capacitance or inductance. A DC voltage is applied as reverse bias across the varicap to alter its capacitance.

How is a varactor diode similar to a PN junction diode?

From the diagram given below, it is evident that the symbol of the varactor diode is similar to that of the PN-junction diode. The diode has two terminals: anode and cathode. One end of the symbol consists of the diode, and the other end has two parallel lines that represent the conductive plates of the capacitor.

How is the abruptness of a varactor diode controlled?

As the abruptness of the junction is governed by the doping concentration and also the profile, this is controlled during the manufacture. For an abrupt varactor diode the doping concentration is held constant, i.e constant doping level as far as reasonably possible.

How is the varicap diode related to the diode?

This means that initial changes in reverse voltage give a much greater change in capacitance, than those at higher voltages. The varactor diode or varicap diode is shown in circuit diagrams or schematics using a symbol that combines the diode and capacitor symbols.

Where can I find the varactor diode symbol?

Varactor diode is the commonly used diode in electronic tuners in TVs. Stay tuned with BYJU’S for more such interesting articles. Also, register to “BYJU’S – The Learning App” for loads of interactive, engaging Physics-related videos and an unlimited academic assist.