Sierra Wireless UMTS Spezifikationen PDF herunterladen (Seite 99)

Rev 1 Dec.10 Proprietary and Confidential - Specifications subject to change 99

Figure 8-3: AppCad screenshot for MicroStrip design

If a multi-layered PCB is used, the RF path on the board must not cross any

signal (digital, analog or supply).

If necessary, use StripLine structure and route the digital line(s) "outside" the RF

structure as shown in the figure below.

Figure 8-4: Routing examples

Stripline and Coplanar design requires having a correct ground plane at both

sides. Consequently, it is necessary to add some vias along the RF path.

It is recommended to use Stripline design if the RF path is fairly long (more than

3cm), since MicroStrip design is not shielded. Consequently, the RF signal (when

transmitting) may interfere with neighboring electronics (AF amplifier, etc.). In the

same way, the neighboring electronics (micro-controllers, etc.) may degrade the

reception performances.

50 line

LGA pin for ANT

1 2 ... 94 95 96 97 98 99 100 101 102 103 104 ... 121 122

Keine Kommentare

Sierra Wireless UMTS Spezifikationen Seite 99