BB187,335

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Diodes - Variable Capacitance (Varicaps, Varactors) are electronic components used to affect capacitive reactance in RF and microwave circuits. The BB187,335 is a voltage-variable diode from ON Semiconductor that has a range of uses in such applications. This article details the range of application fields and the working principle of the BB187,335.

Application Fields

The BB187,335 is used in a range of applications. It is well suited to use in devices where precise tuning of RF frequencies is crucial. It is also used in wireless transceivers and in land-mobile radios where variable frequency control and low power consumption are important. Other uses include oscillators, filters, and phase-locked loops.

The low noise output of the BB187,335 makes it popular in signal processors, especially those that involve a high sample rate. It is also used in signal up converters, down converters, and signal measurement applications. In such applications, the device’s low-distortion performance and wide range of capacitance are valued.

Working Principle

The BB187,335 is a voltage-variable diode that varies its capacitance in accordance with the voltage applied to it. Its operation is based on the classic junction capacitance of a semiconductor diode. A reverse-biased junction causes electrons and holes to flow from the lightly doped regions of the N-type and P-type regions of the diode, respectively. This flow, known as reverse-biased junction current, creates an electric field that affects the flow of electrons and holes, controlling the effective capacitance of the diode’s junction.

The BB187,335 is a multi-terminal device, allowing the user to control the capacitance by applying a voltage to one of the four pin terminals. This voltage is used to control the space charge regions of the diode, which in turn controls its capacitance. The total capacitance can be modulated from 0.35pF to 4.0pF, with a typical variation range of 0.1-2.5pF. The \'on-state\' capacitance is typically 0.5pF, while the maximum off-state capacitance is typically 10pF.

The BB187,335 is a near-ideal component for controlling capacitance in RF and microwave applications. Its low threshold voltage gives it excellent linearity and low distortion. The low leakage currents, low noise, and low temperature coefficient of the BB187,335 make it easy to use and highly reliable.

Conclusion

The BB187,335 from ON Semiconductor is a versatile voltage-variable diode that can be used in a range of RF and microwave applications. It is ideal for use in devices where precise RF frequency control and low power consumption are important. In addition, the low noise and low impedance output of the BB187,335 make it suitable for use in signal processors, up-converters, and down-converters. The working principle of the BB187,335 is based on the classic junction capacitance of a semiconductor diode. A voltage is applied to one of the terminals, which controls the capacitance of the device. The BB187,335 is a reliable and low-cost solution for applications where variable capacitance is paramount.

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