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Inductor in BlueNRG HF crystal circuit?

Question asked by palmer.charles on Apr 1, 2015
Latest reply on May 14, 2015 by de vita.placido
The reference schematics in AN4630 "PCB design guidelines for the BlueNRG and BlueNRG-MS devices" show an inductor L6 in series with one of the capacitors on the high-frequency crystal, but the app note provides no explanation for this or any value.

What is this inductor for? Should it be used? What value should be used?