BB 664-02V E7902

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Diodes - Variable Capacitance (Varicaps, Varactors)
Varicap diodes, also called Varactor diodes, are constructed from a solid state semiconductor material and used mainly in tuning and frequency control circuits. They are usually used in applications that require the capability to electrically vary the capacitance over a wide dynamic range. The BB 664-02V E7902 is a varactor diode commonly used in applications such as oscillator circuits, sampling circuits, and automatic frequency control loops. It has a reverse bias voltage range of 7 to 30 volts and a capacitance range of 19.5 to 34 pF.

The basic principle of operation of a varactor diode is based on the fact that when a reverse voltage is applied across it, an internal depletion region is formed, creating a variable capacitance. When the applied voltage increases, the depletion region increases due to additional reverse biasing, resulting in higher capacitance. Conversely, as the applied voltage is decreased, the depletion region size reduces, resulting in lower capacitance.

It is this simple mechanism that makes varicaps so useful in a variety of applications. They are often used to control the frequency of oscillators in RF and microwave applications, where a variable capacitance is needed in the tuned circuit to allow the tuned circuit to be tuned to different frequencies.

In sampling circuits, a variable capacitance is often needed to control the sample and hold time in order to discriminate between signal transitions that may be short but rapid. This is often required in phase-locked loops and other frequency control/measurement applications.

Finally, the adjustable capacitance range of the BB 664-02V E7902 makes it well-suited for automatic frequency control loops. In these applications, the varactor diode is used to ensure the stability of the control loop in the presence of frequency variations or disturbances.

In summary, the BB 664-02V E7902 is a varactor diode commonly used in a variety of frequency control applications, such as oscillator circuits, sampling circuits, and automatic frequency control loops. It has a reverse bias voltage range of 7 to 30 volts and a capacitance range of 19.5 to 34 pF. Its adjustable capacitance allows it to be tuned to various frequency ranges, and it is also useful in sample and hold circuits and automatic frequency control loops.

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