ZC836BTA Discrete Semiconductor Products

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Variable capacitance diodes, such as the ZC836BTA, are semiconductor devices that exhibit an adjustable capacitance based on an applied voltage. As a member of the diode family, they have the same anode and cathode as other diodes but the voltage inversely affects their capacitance. As the voltage increases, the capacitance decreases and vice-versa. This applied voltage could come from either a constant voltage source or a linear voltage ramp.

The ZC836BTA (or varicap diodes as they are commonly referred to) exhibits an extremely wide capacitance range, from about 0.3 to about 4.5pF. It is most commonly used in applications where a rapidly changing voltage is needed to modulate a frequency, such as local oscillators, phase frequency detectors, and crystal oscillators. The ZC836BTA can also perform modulation operations in radio frequency (RF) circuits when used as a tuned element or a comb resonator.

The capacitance range of varicap diodes is determined by the applied voltage, but this range can also be changed by adjusting the physical structure of the component. For example, the ZC836BTA is made with a small piece of gallium arsenide (GaAs) on top of a silicon substrate that forms a PN junction. This GaAs layer controls the capacitance range, allowing the ZC836BTA to have a range of 0.3 - 4.5pF. In addition, the internal capacitance of the diode can be varied by adjusting the position of the diode’s voltage terminal.

The component also has very low noise characteristics, as well as high linearity and repeatability in its switching and modulation performance. This makes the ZC836BTA both reliable and accurate for many important tasks. In addition, it has a low leakage current for long life and superior stability.

The main applications for the ZC836BTA variable capacitance diode are related to RF modulation and local oscillator circuits. As a tuning element and comb resonator, the diode can be used in a variety of RF circuits and systems. Other common uses include voltage-controlled oscillators (VCOs), frequency multipliers, transceivers, and radio communications systems.

The ZC836BTA is an excellent example of a variable capacitance diode, and its ability to change capacitance with an applied voltage makes it a useful component for many types of circuit design and systems. Its wide capacitance range, linearity, and low noise characteristics make it a highly reliable and accurate component for many applications.

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