BB156,115

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Diodes with variable capacitance, also known as Varicaps, Varactors, or Variable Capacitance Diodes, are specialized semiconductor devices that are predominantly used as frequency control elements in oscillators or filters. The BB156/115 is a surface mount varicap that operates between 500kHz to 4GHz. It is either a 2-terminal or 3-terminal device depending on the model, packaged in a MINI-MELF or SOT-323 molded plastic case respectively.The BB156/115 implements a design in which the diode’s capacitance can be varied through an applied reverse voltage, providing very precise control. This is usually done responsive to the incoming signal that requires frequency control, allowing the circuit to adjust automatically and seamlessly. The working principle of the device is that as the reverse voltage applied across the diode’s terminals is increased, its internal capacitance is also increased. This stored energy between the two plates is formed from a number of effects; the construction of the diode’s material, the quality factor of the material, and the junction’s geometry. The design geometry of the BB156/115 is such that the distance between the junction plates, known as the junction spacing, is decreased as the reverse voltage is increased, resulting in an increase in the device’s capacitance. As a result, the frequency of the generated signal can be accurately and rapidly changed, allowing the desired adjustment that can be used to lock onto and track the signal.The BB156/115’s construction includes three core components; the diode’s anode, the diode’s cathode, and an insulating layer between the anode and the cathode. The anode and cathode are connected to integrated circuitry that is designed to sense the incoming signal’s frequency and adjust the device’s capacitance accordingly. A key feature of the BB156/115 is its extremely low voltage requirements, making it perfect for a range of applications that require precision control over a signal’s frequency. The applications of the BB156/115 are varied and include but are not limited to; television tuners, VCO’s, oscillators, filters, and voltage controlled oscillators. These devices can be used to adjust the frequency of an incoming signal, allowing for rapid and accurate lock-on and monitoring of constantly changing signals. An additional benefit of the BB156/115 is its ability to accurately track small frequency changes, allowing for more sensitive receiver’s setups.The BB156/115 Variable Capacitance Diode is a specialized semiconductor device commonly used as a frequency control element. It offers very precise frequency control of the incoming signal over a wide range, while requiring extremely low voltage. Its applications are varied and include, but not limited to, television tuners, VCO’s, oscillators, filters, and voltage controlled oscillators.

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