SMV1494-079LF

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

SMV1494-079LF is a kind of diodes, which is particularly group into Variable Capacitance(Varicaps, Varactors) type. It is a non-isolated PIN varactor diode manufactured by Abracon, which enjoys an excellent performance especially in Small-Signal RF applications. This diode device is designed to provide a capacitance range of 0.9 to 13.7 pF between its terminals, and requires low level of reverse biased voltage of 3V with low parasitic resistance.

Features

SMV1494-079LF displays great features of low capacitance ratio, low shunt capacitance, low reactance, and low voltage. Also, it exhibits respectable working frequency range of range of 10MHz to 500MHz, in which it enjoys highest performance of maximum capacitance. This devcie also serves with excellent stability of capacitance and impedance.

Application Field

The applications of SMV1494-079LF mainly involve spread spectrum radios, receiver front-end modules, filters, mixers, and other RF circuits. With characteristics of stability and low capacitance, this diode is applied widely as it shows high performance as its counterparts in terms of storage containers, frequency modulation, and timing conversations. Besides, it can also be found in antenna matching units, artificial neural networks, buffer amplifiers and even touch controllers.

Working Principle

SMV1494-079LF has a PIN capacitor structure which helps the device to generate a capacitive divider depending on the reverse voltage. This capacitor device’s operating voltage range is from 0 V to 5 V, while the operating frequency range is from 300 KHz to 500 MHz. As a result, the working voltage is linear, which is proportional to the capacitance.

A basic configuration of this diode contains two electrodes and a dielectric layer. The electrodes are made of depleting material such as n+/p+ junction. The main function of the electrodes is to store electric charges and the electrons. The dielectric layer helps the electrodes to control the flow of current due to its property of impedance. As the reverse voltage is adjusted, the impedance will be increased or decreased accordingly, leading to the change in capacitance.

Furthermore, the device is mainly composed of two PN diodes which are connected in series. When the device is reverse bias, the voltage across the diode junction will experience depletion layer, leading to an increase in capacitance. When the diodes are reverse bias, the depletion layer across the junction keeps expanding until the capacitance reaches the maximum value. In other words, the capacitance of this device is majority determined by the reverse bias voltage.

Conclusion

SMV1494-079LF is one example of Variable Capacitance type diode, which enjoys popularity especially in RF applications. Its application field covers from antenna matching units to buffer amplifiers, due to its feature of stability and low capacitance. The working principle of this device is according to the circuit structure which consists of two electrodes and a dielectric layer. Furthermore, the device is mainly driven by the reverse biased voltage, which determines the capacitance.

The specific data is subject to PDF, and the above content is for reference