BB189,115 Discrete Semiconductor Products

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Variable capacitance diodes, also known as varicaps or varactors, are semiconductors that can vary the capacitance in an electronic circuit by means of an external voltage. The BB189 and BB115 are two examples of variable capacitance diodes.

Variable capacitance diodes are typically constructed of two layers of semiconductor material and a third layer of oxide. When a voltage is applied to the oxide layer, the volume of the oxide layer increases or decreases, which in turn adjusts the capacitance of the diode. This variation in capacitance can be used to adjust the frequency of a circuit, the amplitude of an audio signal, the gain of an amplifier, or the time constant of an oscillator.

The BB189 and BB115 are two types of variable capacitance diodes typically used for frequency modulation (FM) applications. Both BR89 and BB115 diodes offer an adjustable capacitance range of 10 to 36 picofarads respectively. They are ideal for applications where the capacitance needs to be adjusted over a wide range, such as FM radio transmitters and receivers, synthesizers, TVs and VCRs.

The main advantage of using BB189 and BB115 diodes is their low leakage current. This ensures that the capacitance variations are stable even when the diodes are not connected to the circuit. Additionally, both diodes are temperature stable, allowing them to be used in very demanding temperature environments.

In order to optimize performance, both types of diodes should be operated within the recommended voltage range. This is usually between 0 to 5 volts for most applications. Exceeding these ranges may cause permanent damage to the diodes.

Another key parameter of the diodes is their forward DC resistance, which is specified for any given capacitance value. This resistance provides a measure of the dynamic impedance of the diode. Higher resistance values provide more stability, but lower values allow the diode to react more quickly to changes in the external voltage. As such, the resistance should be carefully optimized for the application.

In conclusion, the BB189 and BB115 diodes are two types of variable capacitance diodes that are ideal for applications where the capacitance needs to be adjusted over a wide range. Since they offer low leakage current, temperature stability and optimized resistance values, they are suitable for a wide range of applications, including FM radio transmitters and receivers, synthesizers, TVs and VCRs.

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