These diodes are also called as Varicap Diode and are commonly used in RF circuits. Varactor Diode Symbol in general, it looks like a normal PN- junction diode in which one terminal is termed as the cathode and the other terminal is termed as anode. It is well known that the operation of the p-n junction depends on the bias applied which can be either forward or reverse in characteristic. One end is an anode and the second has 2 lines that represent the plates of a capacitor. The P-N Junction diode creates capacitor effect.The capacitance is controlled by applied voltage. Definition: Varactor diode is the one which works on the principle of variation in capacitance by changing the width of the depletion region of P-N junction. Varactor diode is known as Varicap / Tuning diode / Variable capacitance diode. Characteristics and Parameters of Varactor Diode Working principle of varactor diode: At this point the junction capacitance be influenced by on the instigated voltage and the design parameter of the junction. A number of schematic symbols are used to represent a Varactor Diode in circuit diagrams. The graphic symbol is made by adding a capacitor symbol next to the ordinary crystal diode symbol, which vividly shows that this is a special varactor diode. Varactor Diodes: Varactor Diodes are used as variable capacitors. OTHER NAMES The Varactor diode is also known as: Variable capacitance (Varicap) diode Voltage – Variable Capacitor (VCC) diode Tuning diode Variable reactance diode 4. Varactor diodes: – Circuit Symbol of Varactor Diode. They are manufactured with gallium arsenide. Nov 20, 2018 #6 michael1978. Varactor diode 1. It works on reverse biased mode.. Varacter word is formed from words Variable reactance or variable resistor. In this video, what is varactor diode, it's working, the applications and some important specifications are explained. Now let’s find out how we can vary the capacitance of a varactor diode. Varactor diodes symbol. Zener Diode Symbol, Schottky Diode Symbol, Backward Diode, Tunnel Diode Symbol, PIN Diode, LED Symbol. 11. A junction with constant reverse biasing can be utilized as a capacitance. Its capacitance varies by changing the reverse voltage. It is used as an electrically controlled capacitance (note that the schematic symbol appears as a hybrid of normal diode and capacitor symbols). It is also known as Varicap diode (Variable Capacitance). How does a varactor diode work? Varactor diode acts as a variable capacitor. The exponent in the denominator γ is akin to an ideality factor in a standard diode, ɸ is the diode’s built-in voltage, and C0 is the diode’s capacitance at zero applied voltage. The symbol of varactor diode is given below. SCHEMATIC SYMBOL 5. At either end of the diode are the P and N regions. When this diode is operated in Reverse biased mode the width of the depletion region can be controlled which makes it act as a capacitor. Varactor diode can only be operated in reverse bias.It acts like variable capacitance in reverse bias operation. Symbol of Varactor Diode: The varactor diode also looks similar to the P-N junction diode it also has 2 terminals one anode and cathode part of its cathode Different symbols are used to represent the vector diode used in the circuit diagram to represent the 3 most popular ones shown below. A Varactor Diode is a Voltage dependent variable capacitor, where the capacitance varies in picofarads. The varactor diode is another special purpose device. The symbol of varactor diode is also shown in the resultant figure. Usually, diodes don’t go well during reverse bias conditions. The schematics symbol of the Varactor diode is as shown in the following image: Construction of the Varactor Diode: The Varactor Diode is composed of the PN junction thus the basic construction of the Varicap is similar to that of the simple PN junction diode but the PN junction in Varactor diode is optimized for variable capacitance. These diodes are also called as variceal diodes. The vector stencils library "Semiconductor diodes" contains 24 symbols of semiconductor diodes for drawing electronic schematics and circuit diagrams. A Varactor Diode may also be known as a Varicap or the term VVC. In tunnel diode, the p-type semiconductor act as an anode and the n-type semiconductor act as a cathode. We know that a anode is a positively charged electrode which attracts electrons whereas cathode is a negatively charged electrode which emits electrons. Of them, the three most popular representations are shown below: Among these three symbols of a Varactor Diode, the second symbol is more frequently used. This page describes varactor diode basics and varactor diode applications.The link to varactor diode calculator,PIN diode,Tunnel diode and GUNN diode basics and applications are also mentioned.. Varactor diode is one of the many microwave semiconductor devices in use today.. Figure \(\PageIndex{11}\): Varactor diode schematic symbol. For all of these there are distinct circuit symbols. Varactor diode is a unique type of diode. BASIS OF OPERATION Operates in reverse bias and this gives rise to three regions. And this is the schematic symbol for a Schottky diode. The circuit symbol of tunnel diode is shown in the below figure. Zener Diode: Allows current flow in one direction, but also can flow in the reverse direction when above breakdown voltage : Schottky Diode: Schottky diode is a diode with low voltage drop: Varactor / Varicap Diode: Variable capacitance diode: Tunnel Diode : Light Emitting Diode (LED) Parametric amplifiers. o The Depletion region act as a capacitor di-electric because of its non conductive characteristic. 434 19. Varactor Diode Applications. ... Varactor or vericap diode is a voltage controlled capacitor that has a variable PN junction capacitance. Each of these diode circuit symbols incorporates the basic diode format, but is modified to indicate the different function. Voltage Controlled Oscillator; Phase and Frequency Modulators; ; Varactor Diode is also known as Tuning Diode, Variable Reactance Diode, Varicap Diode or … Pin diode, the applications and some important specifications are explained PN-junction diodes or thyrectors bias.It acts like capacitance! 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