SMV1276-079LF

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Variable capacitance diodes, commonly known as varicaps and varactors, are two-terminal semiconductor devices that are active elements used for tuning and frequency control. SMV1276-079LF is a type of varicap diode which can be applied in RF communications and timing circuits. In this article, we will provide an introduction to the application field and working principle of SMV1276-079LF.

Application

The SMV1276-079LF is designed to operate over the -55 to 150 degrees Celsius temperature range, making it applicable to a wide range of applications. This device has a reverse voltage range of -15V to -30V and a forward current of 0.5mA. It is suitable for use in high-frequency circuits, such as FM receivers and FM modulators, as well as for filter applications in communications systems. Additionally, this device can be used in frequency control circuits and the adjustment of the resonant frequency. It can be used as a voltage-controlled oscillator (VCO) in frequency synthesizers, as well as radio transmitters, radio receivers, and television systems. The SMV1276-079LF is also suitable for the adjustment of the reference frequency of frequency hopping radios.

Working Principle

The working principle of the SMV1276-079LF revolves around the fact that the size of the depletion layer of the diode affects the capacitance within the diode. When an external bias voltage is applied, the size of the depletion layer changes and the capacitance of the diode is changed. This change in capacitance is then used to regulate the frequency of a circuit in which the diode is utilized.

The SMV1276-079LF is a junction type of varicap diode, meaning it utilizes an N-type and a P-type semiconductor region to create a p-n junction. The p-n junction of this particular varicap diode is symmetric and fully depleted. This means that, when reverse bias is applied, the capacitance of the diode is nearly zero. However, when forward bias is applied to the diode, the capacitance can be varied over a wide range.

The capacitance of the SMV1276-079LF is dependent on the magnitude of the applied bias voltage. The greatest change in capacitance occurs when the diode is biased in the medium forward-bias region just prior to the breakdown voltage. The range of adjustable capacitance lies between 40 and 35pF. As the magnitude of the bias voltage increases, the capacitance of the diode decreases.

Conclusion

In summary, SMV1276-079LF is a type of varicap diode which can be used for frequency control and tuning applications. This device can operate from -55 to 150 degrees Celsius and has a reverse voltage range of -15V to -30V. The capacitance of the diode is dependent on the magnitude of the applied bias voltage, and the greatest change in capacitance occurs in the medium forward-bias region. The range of adjustable capacitance lies between 40 and 35pF. This device is suitable for use in FM receivers, FM modulators, filter applications, frequency hopping radios, and other communication system applications.

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