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PDF AN414 Data sheet ( Hoja de datos )
| Número de pieza | AN414 | |
| Descripción | LAYOUT DESIGN GUIDE | |
| Fabricantes | Silicon Laboratories | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AN414 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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AN414
EZRADIOPRO™ LAYOUT DESIGN GUIDE
1. Introduction
The purpose of this application note is to help users design EZRadioPRO PCBs using good design practices that
allow for goo d RF performance. The application no te also helps the designer by sep arating TX an d RX issu es
within this document.
2. Design Recommendations when using EZRadioPRO RF ICs
Extensive testing has been completed using reference designs provided by Silicon Labs. It is recommended to
designers to use the reference designs “as-is’” since they minimize de-tuning effects caused by parasitics
generated by component placement and PCB routing.
When layouts as shown in the reference designs cannot be followed due to PCB size and shape limitations of
the final product then the layout design rules shown in this document are recommended.
2.1. Guidelines for Layout Design when using Si4431
For reference, examples shown in this section of the guide are based upon the layout of the 4431-DKDB1 testcard
(separated TX and RX paths).
The choke inductor (L1) should be placed as close to the TX pin as possible (even if this means the RX is
further away).
The parallel inductor (L6) in the RX path should be perpendicular to the choke inductor (L1) in the TX path as
this will reduce TX to RX coupling.
The TX and RX sections should be separated by a ground metal on the top layer to reduce coupling.
The match used for the TX, should be kept to the smallest board space as is possible.
Ground Metalization
TX Section
RX Section
L6
TX Pin L1
Figure 1. Si4431 Component Orientation, Placement, and GND Metalization
(vias suppressed for clarity)
Rev. 0.1 5/09
Copyright © 2009 by Silicon Laboratories
AN414
http://www.Datasheet4U.com
1 page  
AN414
Table 1. Parameters for 50 W Grounded Coplanar Lines Based on 1.5 mm Thick Substrate
f 240–930 MHz
T 0.035 mm
Er 4.5
G0 .25 mm
H1 .5 mm
W1 .26 mm
Figure 7. Grounded Coplanar Line Parameters
Rev. 0.1
5
5 Page 
3.2. Common TX/RX Connector with RF Switch
AN414
Rev. 0.1
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AN414.PDF ] | |
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