BB131,135

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Variable capacitance diodes are currently among the major components used in modern electronic applications. This is mainly because their design and components allow them to have variable capacitance in a wide variety. It is important to understand their application areas and working principles in order to get the best out of them.

BB131 and BB135 are popular variable capacitance diodes. They are constructed in a planar geometry using a uniform single layered structure. This single layer consists of a P-type layer and an N-type layer. The structure is formed by depositing a film of silicon on the substrate. Tight control of the film thickness and doping concentration provides a high level of accuracy and uniformity.

BB131 and BB135 are commonly used in mobile radio tower applications. This is because they allow fine tuning of the RF signal to the desired frequency in mobile base stations. They are also used in consumer electronics such as television receivers and car alarms, where they are used to adjust the response of the circuits. They can also be used in frequency discrimination circuits.

The operating principle of variable capacitance diodes is similar to that of ordinary silicon diodes. The applied voltage across the terminals of the diode results in a change in the capacitance that has been stored. This change can be made to be almost instantaneous and this is what makes them suitable for various applications. The capacitance of a BB131 or BB135 is usually in the range of 0.001 pF to 1.2 pF. The amount of change depends on the applied voltage and the operating temperature.

BB131 and BB135 are quite versatile and are used in a variety of applications. They can be used in modulation circuits, such as modulation of radio frequencies or communications signals. They are also used in oscillators, such as those used in alarm systems or radars. Furthermore, they can be used in RF circuits, such as in satellite receivers, where they can be used to adjust the frequency of an incoming signal.

BB131 and BB135 are also used in a variety of other applications. They can be used for impedance matching in analog to digital converters, as well as in AC coupling circuits. They can be used in charge pumps, such as those used in high-voltage supplies, and in voltage controlled oscillators.

In summary, BB131 and BB135 variable capacitance diodes are used for their ability to exhibit a wide range of variable capacitance. This makes them ideal for a variety of modern electronic applications such as mobile radio towers, consumer electronic devices, and frequency discrimination circuits. They operate on the same principle as ordinary silicon diodes and the amount of capacitance they can store depends on the applied voltage and temperature.

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