BB207,215 Discrete Semiconductor Products

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Diodes - Variable Capacitance (Varicaps, Varactors) offer a wide range of applications. The two main types of variable capacitance diodes are the BB207,215 and the BB405. These two types of diodes can be deployed in applications such as RF amplifiers, voltage-controlled oscillators, impedance matching and switched capacitor filters. This article discusses the application field and working principle of BB207,215 diodes.

The BB207,215 is a type of junction diode which has a reverse bias built into the diode. When this diode is reverse-biased, its capacitance changes as the applied voltage changes. This feature is known as the reverse-voltage-dependent capacitance (VRD-C) characteristics.

The capacitance of BB207,215 varies with changing applied voltage, the capacitance decreases as the reverse bias increases, and vice-versa. The variation range of capacitance is typically in the range of 10-20%. The capacitance of the diode changes abruptly at the breakdown voltage (typically 0.8V - 1V). The diode also has a high breakdown voltage, typically exceeding 20V.

BB207,215 diodes are typically used in applications where a variable capacitance is needed. Common applications include RF amplifiers, voltage-controlled oscillators, impedance matching and switched capacitor filters. Additionally, the diode can be used for tuning inductors, for example in tuning an oscillator circuit.

In RF amplifiers, the variable capacitance of the diode offers the ability to tune the amplifier to a specific frequency range. This is done by connecting the diode in parallel to the inductor used in the amplifier circuit. The capacitance of the diode is then adjusted to reach the desired frequency.

In Voltage controlled oscillators (VCOs), the frequency of the oscillator is dependent on the voltage applied to it. The BB207,215 diode is placed in the circuit, and its capacitance is then adjusted as per the applied voltage. This in turn varies the frequency of the oscillator.

The BB207,215 can also be used for impedance matching, where it is used to match the input impedance of the amplifier circuit to the output impedance of the circuit. By changing the capacitance of the diode, the input and output admittances of the amplifier can be matched, resulting in improved gain and efficiency of the amplifier.

The BB207,215 can also be used in switched capacitor filters, which employ diodes to reduce the amount of capacitance needed in the circuit. A capacitor is connected to the diode and the voltages applied to it are adjusted to switch the capacitor on or off. By adjusting the capacitance of the diode, the circuit can be tuned to a specific frequency range.

Finally, the BB207,215 can also be used for tuning inductors. This is done by connecting the diode in parallel to the inductor, and then adjusting the capacitance of the diode to match the desired frequency. This can also be done by adjusting the bias voltage applied to the diode or by adding an additional diode in parallel with the inductor.

In conclusion, the BB207,215 is a type of variable capacitance diode which has a wide range of applications. It is used in RF amplifiers, voltage controlled oscillators, impedance matching, switched capacitor filters and inductor tuning. The capacitance of the diode varies with changing reverse bias voltage, and its capacitance range is typically in the range of 10-20%. Additionally, the diode has a high breakdown voltage which exceeds 20V, making it an ideal solution for many application fields.

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