Varactor Diode In Fm

Varactors are operated in a reverse biased state so no dc current flows through the device. Varactor diodes are used along with reactance modulator to provide automatic frequency correction for an fm transmitter.

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Varactor diode in fm. Varactor diode construction the varactor diode is made up of the p type and n type semiconductor. The disadvantage of this varactor diode modulator is that is uses a two terminal device. The varactor diode is manufactured in such as way that it shows better transition capacitance property than the ordinary diodes.

The circuit of figure 5 13 shows such a modulator. Varactor diodes are found in radios fm receivers televisions and microwaves. View a of figure 2 15 shows the varactor schematic symbol.

The capacitance of d 1 of course is controlled by two factors. Varactor diodes are certainly employed frequently together with a reactance modulator to provide automatic frequency correction for an fm transmitter. It works on reverse biased mode.

A fixed dc bias and the modulating signal. Fm transmitter with varactor diode tuning presented here is a low power fm transmitter with varactor diode tuning using surface mount devices smd that will be received with a standard fm radio. Expert insight the variable voltage capacitance effect occurs in all diodes but varactors are specifically made for this purpose.

The p n junction diode creates capacitor effect. The variation is achieved by applying a reverse bias. A varactor diode is a semiconductor diode whose junction capacitance varies linearly with applied voltage when the diode is reverse biased.

The amount of reverse bias controls the thickness of the depletion zone and therefore the varactors junction capacitance. The varactor diode modulator circuit is shown in fig5. The varactor is simply a diode or pn junction that is designed to have a certain amount of capacitance between junctions.

A diagram of a varactor in a simple oscillator circuit is shown in view b. In fig b the bias on d 1 is set by the voltage divider which is made up of r 1 and r 2. The junction capacitance of varactor diode varies linearly with applied voltage.

This is not a working circuit but merely a simplified illustration. For generation of fm wave. Varactor diode modulator is a semi conductor diode having a variable junction capacitance.

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. Usually either r 1 or r 2 is made variable so that the center carrier frequency can be adjusted over a narrow range. Varactor fm modulatoranother fm modulator which is widely used in transistorized circuitry uses a voltage variable capacitor varactor.

The capacitance is controlled by applied voltage. Generally the depletion region thickness is proportional to the square root of the applied voltage.

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