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Layout Guidelines
Figure 24
describes the MIMO antenna spacing. The distance of ANT1 and ANT2 must be greater than
half of wavelength (62.5 mm at 2.4 GHz).
The supply routing guidelines are as follows:
•
For power supply routing, the power trace for VBAT must be at least 40-mil wide.
•
The 1.8-V trace must be at least 18-mil wide.
•
Make VBAT traces as wide as possible to ensure reduced inductance and trace resistance.
•
If possible, shield VBAT traces with ground above, below, and beside the traces.
The digital-signal routing guidelines are as follows:
•
Route SDIO signal traces (CLK, CMD, D0, D1, D2, and D3) in parallel to each other and as short as
possible (less than 12 cm). In addition, each trace must be the same length. Ensure enough space
between traces (greater than 1.5 times the trace width or ground) to ensure signal quality, especially
for the SDIO_CLK trace. Remember to keep these traces away from the other digital or analog signal
traces. TI recommends adding ground shielding around these buses.
•
Digital clock signals (SDIO clock, PCM clock, and so on) are a source of noise. Keep the traces of
these signals as short as possible. Whenever possible, maintain a clearance around these signals.
22
WL1835MODCOM8B WLAN MIMO and Bluetooth
Figure 24. MIMO Antenna Spacing
®
Module EVM
Copyright © 2013–2015, Texas Instruments Incorporated
SWRU359E – September 2013 – Revised September 2015
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