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Fixed Inductors

Fixed inductors, also referred to as fixed coils, are used to create an inductance in an electric circuit. They typically have some form of electrical connection, such as a ceramic interface, to allow them to be connected to an external circuit.

One type of fixed inductor is the DRA124-8R2-R. This is a high-frequency, low-noise, low-power inductor with a rated frequency of up to 8GHz. It is designed for use in radio frequency (RF) circuits, where its low noise characteristics allow it to minimise interference and improve performance. In this application field, it is often used to filter out unwanted harmonics and to act as an impedance matching device. The inductance of the DRA124-8R2-R is between 420 nH and 440 nH, depending on the manufacturer.

Working Principle

The basic working principle of an inductor is that of an electrical transformer. When an alternating current (AC) passes through an inductor, the device creates a magnetic field. This field induces an electromotive force (EMF) in the inductor, which in turn produces a current through the inductor. This is known as inductive reactance. By controlling the voltage and the frequency of the incoming AC signal, the value of the inductance can be adjusted in the circuit.

In the case of the DRA124-8R2-R, this control is provided by specialised circuitry. This circuitry is designed to ensure that the inductance stays within a predefined range, while also providing a low level of noise. The frequency-dependent characteristics are managed by the components of the circuit, allowing it to function correctly at a wide range of frequencies.

In addition to its inductive reactance, the DRA124-8R2-R can also provide a level of impedance matching. This is achieved by controlling the strength of the EMF, which influences the impedance of the circuit. By adjusting the EMF level, the impedance can be accurately adjusted to the desired level.

Conclusion

The DRA124-8R2-R is a high-frequency, low-noise, low-power inductor designed for use in RF circuits. With its range of frequency-dependent characteristics, it can be used to filter out unwanted harmonics and for impedance matching. Its circuitry ensures that the inductance is within a predefined range and that noise levels are kept to a minimum.

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