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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
The varactor diode is used in frequency tuning applications. Its effective capacitance is a function of the reverse bias voltage across it.
YES
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.
The varactor diode is a semiconductor diode but in this kind, the capacitance is supposed to vary according to the applied voltage. It has an exponent factor that bears a negative fraction value.
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
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.
It is called a varactor or a varicap diode. Its capacitance varies nonlinearly with the reverse voltage applied to its terminals.
The varactor diode is used in frequency tuning applications. Its effective capacitance is a function of the reverse bias voltage across it.
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. . .
varactor diode is a correct answer
YES
invented by Arthur Uhlir and A. Bakanowski
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.
The varactor diode is a semiconductor diode but in this kind, the capacitance is supposed to vary according to the applied voltage. It has an exponent factor that bears a negative fraction value.
The capacitance of a varicap diode varies as the reverse voltage to the diode changes. As you increase the reverse voltage, the capacitance decreases. And vice versa.
Phase shift does occur, but the parasitic capacitance of a diode is so tiny compared to the external circuit resistance that it is virtually impossible to observe.