LE910Cx mPCIe Hardware Design Guide
1VV0301510 Rev. 13 Page 25 of 73 2021-07-07
• The PCB traces to the LE910Cx-mPCIE and the Bypass capacitor must be wide
enough to ensure that no significant voltage drops occur. This is for the same
reason as previous point. Try to keep this trace as short as possible.
• To reduce the EMI due to switching, it is important to keep the mesh involved very
small; therefore the input capacitor, the output diode (if not embodied in the IC)
and the regulator have to form a very small loop. This is done in order to reduce
the radiated field (noise) at the switching frequency (100-500 kHz usually).
• A dedicated ground for the Switching regulator separated by the common ground
plane is suggested.
• The placement of the power supply on the board should be done in such a way to
guarantee that the high current return paths in the ground plane are not
overlapped to any noise sensitive circuitry as the microphone amplifier/buffer or
earphone amplifier.
• The power supply input cables should be kept separate from noise sensitive lines
such as microphone/earphone cables.
• The insertion of EMI filter on VBATT pins is suggested in those designs where
antenna is placed close to battery or supply lines.
• A ferrite bead like Murata BLM18EG101TN1 or Taiyo Yuden P/N FBMH1608HM101
can be used for this purpose.
The below figure shows the recommended circuit:
Figure 3: Recommended Circuit
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