40Mhz Crystal Layout; Misc - Realtek RTL8762C Hardware Instructions

It is suggested that a complete GND via array should be placed to protect the RF
trace (shown in yellow rectangular marked below).
 The layout and component placement should be as concentrated as possible to reserve more
space for a bigger antenna, and keep more RF clearance area.

13.6 40MHz Crystal Layout


If there is no mechanical restrictions, crystal and BT CHIP should be on the same layer.

Crystal should be far away from RF trace to avoid interference with RF signal.

Crystal should be close to BT CHIP to keep a short routing path; the trace width should be at
least 6mil.

If it is a 2-layer PCB, avoid tracing on the back layer of crystal, and try to keep a complete
ground reference at the next reference layer (bottom side).
TOP Layer range of crystal:
Note the distance from RF trace

13.7 MISC


Avoid the situation that traces on two adjacent layers are overlapped.
RTL8762C Evaluation Board User Manual
Bottom layer range of crystal:
Forbidden any trace, and keep
the copper plane complete.
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