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AN4630 Datasheet(PDF) 28 Page - STMicroelectronics

No. de pieza AN4630
Descripción Electrónicos  PCB design guidelines for the BlueNRG and BlueNRG-MS devices
PDF  33 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4630 Datasheet(HTML) 28 Page - STMicroelectronics

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Design recommendations when using
WLCSP34 package
AN4630
Figure 24: RF ground on the discrete balun application board
To design the board with the integrated balun as matching network all the above
suggestions has to be implemented. The only difference is located in the balun zone where
the datasheet recommendation has to be followed. Particular attention to the ground must
be observed: also in this case the RF ground in the TOP layer is “hot” and it could generate
pulling. The RF TOP layer ground has to be extended to the balun zone (see Figure 25:
"RF ground on the integrated balun application board "), but has to be merged to the other
ground on the INNER3 layer.
Figure 25: RF ground on the integrated balun application board
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DocID027262 Rev 1



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