Routing Constraints and Recommendations
Rev 1 Jul 17
9
41111210
Antenna
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 information on routing constraints for the RF circuit, see
RF Circuit on
page 10
.
PCB Specifications for the Application
Board
Sensitive signals (such as audio, UIM, and clocks) should be protected by ground
planes/fills. Routing sensitive signals close to noisy signals could result in noise
being coupled.
Recommended PCB Land Pattern
Refer to
AirPrime WPx5/WP76 Series Customer Process Guidelines
, available at
http://source.sierrawireless.com
.
Routing Constraints
Power Supply
If the following design recommendations are not followed, phase error (peak) and
power loss could occur.
•
Since the maximum peak current can reach 2.5 A, Sierra Wireless strongly
recommends having a large width for the layout of the power supply signal (to
avoid voltage loss between the external power supply and VBAT_BB/
VBAT_RF.
Figure 4-1: Power Supply Routing Example