Crystal layout considerations for WirelessUSB Lp

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    Question: What are the crystal layout considerations for a WirelessUSB LP based system?

     

    Answer:

    The crystal layout is best if the following conditions are met:

    ■ Crystal and radio are on same side of PCB
    ■ Crystal is placed near the crystal pin on the radio
    ■ Crystal trace paths are as short as possible
    ■ Match crystal trace paths for length and parasitic capacitance
    ■ Avoid vias on crystal traces
    ■ Isolate the crystal from noise sources