ferrite bead selection for GSM application

Asked Mar 19 '19 at 22:13

Active Mar 19 '19 at 22:20

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I am trying to get a better understanding of a good method for selecting ferrite beads from those available.

I have a CLC filter, with 1uF x7r ceramics for each C, L being a ferrite bead in a 0805 package. Following this a LDO regulator that may need to supply 80mA peak of regulated supply. There is a GSM antenna operating from 850-2100MHz a few cm away, which is why there is additional filtering at the input of the LDO which is a noise sensitive 3V rail (10uF + 1uF + 0.1uF + 47pF on output). Assuming we are not going to change this arrangement, could you make some suggestion on how to select this part?

I have read guidelines of specifying the load to be no more than 20% of its rated current. This is the ferrite bead I am currently looking at. How would this other ferrite bead compare, since it has a very different profile?

Comments? Thoughts? Suggestions?

edited Mar 19 '19 at 22:20

asked Mar 19 '19 at 22:13

Schematic? What is your design goal? – winny Mar 19 '19 at 22:33
Start with spectral PSRR and Load Reg step load specs then use s-parms for each part and verify performance or compute Zo to meet spec with spectral load and watch out for anti-resonance – Tony Stewart EE75 Mar 19 '19 at 22:46
Do those capacitors share vias? They must NOT share vias. – analogsystemsrf Mar 20 '19 at 04:11

ferrite bead selection for GSM application

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