BB179B,335

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Variable capacitance diodes, also known as Varicaps or Varactors, are electronic components used as frequency selectors or reversers in electronic circuits. A variable capacitance diode is a specialized diode that exhibits a variable capacitance in response to a modulation signal. The basic operation of a variable capacitance diode is based on the principles of electrostatics. When a variable voltage is applied to the diode, it changes the electric field within the diode and the capacitance between the two electrodes changes accordingly.

BB179B335 is a typical variable capacitance diode. It is a PIN diode with a reverse voltage of 50V. The maximum operating frequency range is 50MHz to 600MHz. The maximum capacitance range is 6.2 to 35.9 pF. It is made up of a p-type doped material (Germanium) and n-type doped material (Arsenide-Phosphide). This PIN diode is an NNN triode with an average forward bias current of 917mA and a reverse bias current of 2mA.

The application field of BB179B335 variable capacitance diode covers many areas, like radio frequency manufacturing, satellite communication, TV broadcasting, and so on. It is widely used as frequency selector, phase shifter, RF switch, voltage-controlled oscillator and frequency mixer in radio frequency system. It can also be used as variable capacitance in filters for improving high frequency characteristics of RF systems.

The working principle of variable capacitance diodes like BB179B335 comes from the concept of electrostatics. The variable capacitance behavior of these diodes is attributed to the motion of holes within the depletion region. When a variable voltage is applied to the diode, the electric field created in depletion region forms a space charge, thus attracting positive holes from the lattice and reducing the potential barrier for electrons in the base region. This outward motion of holes causes a change in the capacitance between the two electrodes.

Thus, the reverse-bias voltage applied to a variable capacitance diode such as BB179B335 is the main parameter that influences the capacitance of the device. A change in voltage can cause a slight change in the capacitance depending on the type of diode used, but generally the capacitance variation is limited to a few pF. This makes the BB179B335 highly useful in radio frequency system as a frequency selector or voltage-controlled oscillator.

Therefore, the BB179B335 is a highly useful variable capacitance diode in a number of applications, from radio frequency manufacturing to satellite communication. It can be used as a frequency selector, phase shifter, RF switch, voltage-controlled oscillator and frequency mixer in RF system for improving the high frequency characteristics of such systems. With its maximum operating frequency range of 50MHz to 600MHz and maximum capacitance range of 6.2 to 35.9pF, the BB179B335 is a versatile and reliable diode for a wide range of applications.

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