Audio Track And Pcb Layout Recommendation - Sierra Wireless WISMO228 Product Technical Specification & Customer Design Manuallines

The types of filtering components are:
•
RF decoupling inductors
•
RF decoupling capacitors
A good "Chip S‐Parameter" simulator is available from Murata. Refer to
http://www.murata.com/products/design_support/mcsil/index.html for more details.
Using different Murata components, it can be seen that different packages (with different values and
ratings) can have different coupling effects. Refer to the following table for examples using different
Murata components.
Package
Filtered band GSM900
Value 100nH
Types Inductor
Position Serial
Manufacturer Murata
Rated 150mA
LQG15HSR10J02 or
Reference
LQG15HNR10J02
Package
Filtered band GSM900
Value 100nH
Types Inductor
Position Serial
Manufacturer Murata
Rated 300mA
Reference LQG18HNR10J00

Audio Track and PCB Layout Recommendation

To avoid TDMA noise, it is recommended to surround the audio tracks with ground as shown in the
following figure.
WA_DEV_W228_PTS_002
GSM850/900
56pF
Capacitor
Shunt
Murata
50V
GRM1555C1H560JZ01
GSM850/900
47pF
Capacitor
Shunt
Murata
50V
GRM1885C1H470JA01 or
GRM1885C1H470JB01
Rev 001
Product Technical Specification &
Customer Design Guidelines
0402
DCS/PCS
15pF
Capacitor
Shunt
Murata
50V
GRM1555C1H150JZ01 or
GRM1555C1H150JB01
0603
DCS/PCS
10pF
Capacitor
Shunt
Murata
50V
GRM1885C1H150JA01 or
GQM1885C1H150JB01
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