Contents
How do you select RF for an inductor?
To select the RF choke, choose an inductor whose self resonant frequency (SRF) is near the frequency where choking is needed. This is because the impedance of an inductor is maximum at its SRF. For an LC circuit, choose the inductor such that its SRF is much higher (~10x) than the operating frequency.
Why does an inductor blocks radio frequency signal?
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. In this circuit RFC (i.e. inductor) passes VCC to MMIC for biasing and blocks RF signal to be amplified towards VCC.
What is another name for an RF inductor?
Radio frequency (RF) inductors have several uses and are available in various construction types to suit the performance needs of specific applications. Matching, resonators, and chokes are common uses for inductors in RF circuits.
Which inductor is used at high frequencies?
Ferrite-core inductor
Ferrite-core inductor For higher frequencies, inductors are made with cores of ferrite. Ferrite is a ceramic ferrimagnetic material that is nonconductive, so eddy currents cannot flow within it.
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.
What is the difference between an RF choke and an inductor?
An RF choke is an inductor, however the frequency selectivity is simply to pass DC and block everything else. In this application the usual figures of merit for inductors may not adequately capture the actual desired performance of the inductor. In many applications inductors are used to pass or block signals.
How are multilayer inductors used in a RF circuit?
Multilayer inductors have the lowest Q value of the three structures. They feature a good overall balance in terms of the inductance value line-up, size and cost, and are used in the matching and resonance circuits of RF units and in all kinds of choke circuits. For typical usage examples, please refer to “Application Examples” page.
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.