BB659H7902XTSA1

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Variable capacitance diodes (or varicaps, varactors) are special diodes designed to exhibit a wide range of capacitances. The BB659H7902XTSA1 varactor from Diodes Incorporated is an example of a wideband tuning varactor. When voltage is applied to the diode, its capacitance changes proportional to the voltage. This type of diode is used in a circuit called a voltage-controlled oscillator (VCO) that produces a frequency determined by the varactor’s capacitance. This makes it possible to tune the circuit to a desired frequency, or even sweep the frequency over a large range using a voltage-controlled sweep generator. Another application of these components are filters, which use the varactor to change the center frequency.

The BB659H7902XTSA1 varactor has several features that make it ideal for use in wideband tuning applications. Most notably, it has a large Capacitance-Voltage slope (CV curve) of 10 pF/V typical. This allows the diode to exhibit a wide range of capacitance with a small change in applied voltage. The capacitance range of the BB659H7902XTSA1 is 6.5 to 25.5 pF at a voltage of 0 to 7 V, giving it a total capacitance tuning range of 19 pF. It is also designed to provide excellent high-frequency performance, with a wide frequency range of 10 MHz to 2500 MHz. The high frequency performance also makes it suitable for use in filters, where the center frequency can be changed with a small variation in the applied voltage.

The BB659H7902XTSA1 is a junction-diode varactor with a reverse voltage rating of 5 V. It is housed in a JEDEC SOT-323 surface-mount package, making it suitable for use in tightly-packed designs. It is rated for -55 to 125 degrees C, making it suitable for use in many environments. The varactor is also designed to be used with a wide range of drain voltages, from 3 to 20 V, allowing it to be used in a wide range of applications.

The principle of operation of the BB659H7902XTSA1 varactor is based on the basic physics principle of capacitance. When a voltage is applied across two conductive plates, an electric field is created, which opposes the flow of electrons. This opposition forms a capacitor, also known as a “condenser”, and is measured as capacitance. The total capacitance of the capacitor is determined by the size and shape of the conductive plates and the distance between them.

In a varactor, the capacitance of the capacitor changes proportional to the applied voltage. This is because the electric field strength between the plates depends on the voltage, as the electric field strength increases, the capacitance of the diode increases as well. This is why the BB659H7902XTSA1 has a high Capacitance-Voltage slope, making it suitable for wideband tuning applications.

In summary, the BB659H7902XTSA1 varactor from Diodes Incorporated is a wideband tuning varactor designed for use in voltage-controlled oscillators and filters. It has an excellent Capacitance-Voltage slope of 10 pF/V typical, and a large capacitance range of from 6.5 to 25.5 pF at a voltage of 0 to 7 V. It is housed in a SOT-323 surface-mount package, and is rated for -55 to 125 degrees C. Its principle of operation is based on the basic physics principle of capacitance, and its capacitance changes proportional to the voltage applied to the diode. All of these features make the BB659H7902XTSA1 an excellent choice for wideband tuning applications.

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