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resistor pad will be placed on the board and a potentiometer used by the
FCC test lab to adjust the output power to the maximum legal limit. The
potentiometer value would then be measured and the closest standard
value resistor placed for final testing.
If the level adjust resistor does not provide enough attenuation, a T-pad
attenuator can be placed between the transmitter and antenna. This is a
network of three resistors that will provide a set amount of attenuation while
maintaining a 50-ohm match between the antenna and the transmitter.
Application Note AN-00150 gives the formulas for calculating the resistor
values. If not needed, the series resistors can be zero ohms or shorted and
the parallel one not placed.
Board Layout Guidelines
If you are at all familiar with RF devices, you may be concerned about
specialized board layout requirements. Fortunately, because of the
care taken by Linx in designing the modules, integrating them is very
straightforward. Despite this ease of application, it is still necessary to
maintain respect for the RF stage and exercise appropriate care in layout
and application in order to maximize performance and ensure reliable
operation. The antenna can also be influenced by layout choices. Please
review this data guide in its entirety prior to beginning your design. By
adhering to good layout principles and observing some basic design rules,
you will be on the path to RF success.
The adjacent figure shows the suggested
PCB footprint for the module. The actual
pad dimensions are shown in the Pad
Layout section of this manual. A ground
plane (as large as possible) should be
placed on a lower layer of your PC board
opposite the module. This ground plane
can also be critical to the performance
of your antenna, which will be discussed
later. There should not be any ground or
traces under the module on the same
GROUND PLANE
ON BOTTOM LAYER
Figure 17: Suggested PCB Layout
layer as the module, just bare PCB.
During prototyping, the module should be soldered to a properly laid-out
circuit board. The use of prototyping or “perf” boards will result in horrible
performance and is strongly discouraged.
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