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Voltage controlled variable capacitor. Usually used for dynamic tuning of resonant circuits.
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Application of varactor diode?
It includes RF design , parametric amplification ,fm, harmonic generators, voltage controlled oscillators ,in radio ,tv,cellular and wireless receivers ,and in electronic tuning .. That's it. . .
What is the function of zener dioed?
The function of a zener diode is for it to act as a voltage regulator in the breakdown region.
What are special purpose diodes?
Special diode does special function. Diodes are originally used to rectify ac current into dc current . Other versions of diodes are constructed in a similar way using the same principles but their function is not rectification such as light emmision diode
What is the function of Bypass diode in the test terminals of a pressure transmitter?
The function of the bypass diode is to allow the loop current to be measured without disconnecting the current loop connections. It therefore allows for a quick measurement of the loop current without disturbing any control or monitoring equipment that is connected to it. This is achieved by simply connecting an ammeter across the diode. If the voltage drop across the ammeter is less than that of the diode (about 0.6V) then all of the loop current will flow through the ammeter rather than the diode. The ammeter is therefore able to measure the loop current.
Why transfer characteristics cannot be obtained for a bridge rectifier?
Its because one of the diode gets shorted.The diode in the left lower arm in a bridge rectifier gets shorted by the ground points of both the cro and the function generator.
What is verector diode in electronics?
I think you you are asking about varactor diode. varactor means variable capacitor. varactor diode is a p-n junction diode which provide a capacitance across it subjected to applied forward and reverse bias. means it provide variable capacitance which depends on the applied reverse voltage(mostly varactor diode works on reverse voltage).They are also known as varicap
What type of diode is used as a variable capacitor?
varactor diode is a correct answer
Which diode is used in frequency tuning application?
The varactor diode is used in frequency tuning applications. Its effective capacitance is a function of the reverse bias voltage across it.
Is crystal oscillator used in Varactor diode modulator?
YES
Who invented varactor diode?
invented by Arthur Uhlir and A. Bakanowski
What diode is used as voltage controlled capacitor?
It is called a varactor or a varicap diode. Its capacitance varies nonlinearly with the reverse voltage applied to its terminals.
Explain the use of a varactor diode in a parallel resonance circuit?
Short answer: By using a varactor diode as the capacitance in a parallel resonant ckt, by changing the reverse bias voltage you change the value of capacitance which in turn changes the resonant frequency. This makes a tuneable resonant ckt.
Application of varactor diode?
It includes RF design , parametric amplification ,fm, harmonic generators, voltage controlled oscillators ,in radio ,tv,cellular and wireless receivers ,and in electronic tuning .. That's it. . .
What is best describes how a varactor diode modulator creates FM?
Resonant frequency of a circuit is proportional to sq rt (L x C). A varactor diode, when suitably voltage biased, looks like a capacitor (C). Varying the bias varies the capacitor and thus the resonant frequency .
Explain the operation of a varactor diode in generation of FM?
Varactor diodes are constructed in the same way as a capacitor and operate under reverse bias conditions, which gives rise to three current-conducting regions. Currents conduct through positive (P) and negative (N) regions, located at either end of the diode. Near the junction of the P and N regions, a depletion region ensures that no current carriers are available, thus acting as an insulator. Due to this arrangement, a varactor diode's conductive plates are separated by an insulatorlike dielectric, much like a capacitor Read more: Characteristics of Varactor Diodes | eHow http://www.ehow.com/list_6300842_characteristics-varactor-diodes.html#ixzz2UqM6t1Yi
What is the function of diode what is the function of diode?
A diode is used primarily as a Rectifier
How varactor diode used as parametric amplifier?
A varactor diode is most commonly used as the variable reactor. The varactor is a semiconductor pnjunction diode, and its junction capacitance is varied by the application of a steady signal from a local microwave oscillator, called the pump. Amplification of weak signal waves occurs through a nonlinear modulation or signal-mixing process which produces additional signal waves at other frequencies. This process may provide negative-resistance amplification for the applied signal wave and increased power in one or more of the new frequencies which are generated.
