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"frequency offset" of "reference clock"

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cqmyg5

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could anyone tell me:

if use external crystal as a reference clock, the frequency offset of this crystal is important in a wireless transmitter. what's the special concern on "frequency offset"? It impact which performance of a wireless transmitter?

if when:
Fref=12MHz,
frequency offset=20ppm, it's enouth or not for Bluetooth/802.11b application? why?

Thx?
 

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