ZMV829ATC

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Diodes, specifically variable capacitance (Varicaps, Varactors) such as the ZMV829ATC, are semiconductor components that have the ability to control a frequency, impedance and/or amplitude level in a wide variety of ways. The ZMV829ATC diode is designed to work in frequency multipliers, tunable oscillators and resonators, where accurate control of the frequency and/or amplitude is required.

Applications and Specifications

The ZMV829ATC is an analog, DC-coupled, dual symmetrical varactor diode that is used in general-purpose tuning applications. It provides a wide tuning range of ±15% with a relatively low temperature coefficient and a moderate Q. The device has a relative sensitivity of 0.45V/% and a capacitance between 4 and 25pF. It is available in SOT-443 (DFN) packages with a 0.45mΩ series resistance and a capacitance range of 4-25pF.

Working Principle

A varicap diode, also known as a varactor diode, is a semiconductor device similar to a conventional diode but with the added ability to accurately control capacitance due to a reverse-bias voltage. When the diode is reverse-biased, the depletion region of the diode expands, forming a parallel plate capacitor that can be precisely controlled by the applied bias voltage. This in turn produces a voltage-dependent change in capacitance.

When a varicap diode such as the ZMV829ATC is used as part of a frequency-dependent circuit, such as an oscillator or multiplier, the capacitance can be changed in order to control the frequency. The capacitance can be varied by the changing voltage across the varicap, which in turn varies the frequency. The output frequency of the circuit is then a function of the varicap capacitance.

The ZMV829ATC diode has a wide range of frequency control and is designed to be used as a frequency multiplier, tunable oscillator, or resonator. It is a dual symmetrical varactor, which means that it has two capacitance-voltage curves, one on either side of the zero-biased curve. This allows it to be used in applications where precise frequency control is required.

Conclusion

The ZMV829ATC diode is designed for general-purpose frequency control applications. Its dual symmetrical varactor design allows for precise control of the frequency, making it ideal for multiplier, tunable oscillator and resonator applications. It has a wide tuning range and a relatively low temperature coefficient, providing a cost-effective solution for many frequency control applications.

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