BB555H7902XTSA1

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Diodes - Variable Capacitance (Varicaps, Varactors)

The BB555H7902XTSA1 is an example of a varicap, or variable capacitance, diode. Varicaps are used widely in many electronic circuits, and they have a myriad of applications. This particular diode has a maximum reverse voltage of 30V and a millimetric Varactor Capacitance of 0.02pF to 5.0pF. It is a type of semiconductor device that is renowned for its ease of use and reliable performance.

Application of BB555H7902XTSA1

Varicaps are used to provide automatic control of the frequency, gain, amplitude, and other functions of a circuit. They find ubiquity in radio and television receivers, as well as a host of other electronic devices and systems. Any circuit that requires a controlled capacitance value or frequency can benefit from the use of a Varicap. Examples include FM detectors, PLL circuits, Active filters, amplifier stabilization, and Voltage doublers.

Working Principle

Varicaps are diodes whose junction capacitance varies with the applied voltage. When the voltage is negative, the capability is large and when it is with respect to the ground, the capacitance is small. In other words, the Varicap has an internal capacitance that can change with the external electrical field, i.e. voltage. The ratio between the maximum and minimum capacitance is referred to as the Varactor tuning range.This is a volume ratio, not the numerical value of individual capacitances.

An applied voltage between the Anode and Cathode of the Varicap increases the potential barrier. This narrows the depletion region around the junction, thus reducing the width and area of the junction and the capacitance decreases. A reverse bias voltage has the opposite effect and increases the width and area of the junction which allows for more electrons to pass through, increasing the capacitance. As mentioned above, the BB555H7902XTSA1 has a millimetric Varactor Capacitance of 0.02pF to 5.0pF.

Conclusion

The BB555H7902XTSA1 is an example of a varicap, or variable capacitance, diode. Varicaps are used to provide automatic control of the frequency, gain, amplitude, and other functions of a circuit. They find ubiquity in radio and television receivers, as well as a host of other electronic devices and systems. Any circuit that requires a controlled capacitance value or frequency can benefit from the use of a Varicap. Working on the principle of varactor capacitances, the BB555H7902XTSA1 has a maximum reverse voltage of 30V and a millimetric Varactor Capacitance of 0.02pF to 5.0pF.

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