Contents
What is a high frequency inductor?
The high frequency inductors are used for radio frequency applications. It offers higher reactance at high operating frequencies and hence inductor will block any such higher radio frequencies. It is used in RF circuits between DC and RF circuit path.
What factors need to be considered when designing selecting a coupled or any other inductor?
RF Considerations When an inductor is needed for an RF application, you must keep two factors in mind:
- Q factor (quality), which relates to the inductor’s resistance value. High Q factor is always the more ideal value.
- Self-Resonant Frequency (SRF), which is the frequency when the device ceases its role as an inductor.
What is the difference between a transformer and a coupled inductor?
Coupled Inductor: – A coupled inductor is an inductor with two or more windings on the same core which takes advantage of magnetic coupling to influence the behavior of each winding on the other. Transformer: – A magnetic device that transfers energy instantaneously through its magnetic field.
Which is the best frequency to select for an inductor?
Self Resonant Frequency (SRF) describes the frequency at which an inductor stops working as an inductor. For RF circuits, self resonant frequency should be chosen such that it exceeds the operating frequency of the circuit. As the inductance is zero at the self resonant frequency, the Q factor is zero.
How is the impedance of an inductor chosen?
If the inductor is to be used as a simple one-element (1st order) high-frequency choke, the selection is based on the frequency of peak noise to be choked out. At the self-resonant frequency (SRF) of an inductor, the series impedance is at its maximum.
What is the tolerance of an inductor in a filter?
Tolerance is the variation in the inductance value of an actual inductor compared to the specified value in the data sheet. This could result in unwanted shift in frequency selection of an RF filter.
How is the self resonant frequency of an inductor chosen?
Usually, a high value of Q factor is preferred. Self Resonant Frequency (SRF) describes the frequency at which an inductor stops working as an inductor. For RF circuits, self resonant frequency should be chosen such that it exceeds the operating frequency of the circuit.