In AN-B-018 section 3.4, you suggest using a 4-10mm meandering trace between the Vdcdc/Vdcdc_RF decoupling caps. Can I instead create this inductance with a ferrite bead or chip inductor? About how much inductance are you targeting?
Thanks!
In AN-B-018 section 3.4, you suggest using a 4-10mm meandering trace between the Vdcdc/Vdcdc_RF decoupling caps. Can I instead create this inductance with a ferrite bead or chip inductor? About how much inductance are you targeting?
Thanks!
Hi jfolsom,
of course, that's possible, but more expensive.
没有多少感应tance is needed, it's just for filtering the HF noise and HF ripple, the inductance forms a low-pass filter together with the 1µF at Vdcdc_RF.
The distance between the Vdcdc and the Vdcdc_RF pins already forces you to have a few mm track length. It's relatively easy to add a few mm in order to obtain several nH inductance.
5nH inductance or a little more is enough.
Best regards, BB_Dialog
Thank you!