Antenna; Pcb Specifications For The Application Board; Recommended Pcb Landing Pattern - Sierra Wireless AirPrime SL808 Series Product Technical Specification & Customer Design Manuallines

Product Technical Specification & Customer Design Guidelines
96 Proprietary and Confidential - Specifications subject to change
• The capacity to deliver high current peaks in a short time (pulsed radio
emission).
• The VCC_3V6 line must support peak currents with an acceptable voltage
drop which guarantees a minimal VCC_3V6 value of 3.3 V (lower limit of
VCC_3V6)

8.4 Antenna

Another key issue in the design of a GSM terminal is the mechanical and
electrical antenna adaptation. Sierra Wireless strongly recommends working with
an antenna manufacturer either to develop an antenna adapted to the application
or to adapt an existing solution to the application.
For more information on routing constraints for the RF circuit, see
page 98.
8.5 PCB specifications for the application
board
In order to save costs for simple applications, a cheap PCB structure can be used
for the application board of the AirPrime SL808X Embedded Module. A 4-layer
through-hole type PCB structure can be used.
Figure 8-1: PCB structure example for the application board
Note: Due to the limited layers of 4-layer PCBs, sensitive signals like audio, SIM and
clocks cannot be protected by 2 adjacent ground layers. As a result, care must be taken
during PCB layout for these sensitive signals by avoiding coupling to noisy baseband
through adjacent layers.

8.6 Recommended PCB landing pattern

Refer to [7] Customer Process Guidelines—AirPrime SL Series.
RF circuit on
2400058