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Adjusting the Output Power
Depending on the type of antenna being used and the duty cycle of the
data, the output power of the LC Series transmitter module may be higher
than FCC regulations allow. The output power of the module is intentionally
set high to compensate for losses resulting from inefficient antennas that
may be used to realize cost or space savings. Since attenuation is often
required, it is generally wise to provide for its implementation and allow the
FCC test lab to easily attenuate the transmitter to the maximum legal limit
for your product.
Two methods of attenuation are available using the LC Series transmitter
module. First, a resistor may be placed between Pin 4 (LADJ) and ground
to achieve up to a 7dB reduction in output power. The resistor value is
easily determined from Figure 10 on Page 6. Do not exceed the resistance
values shown as trans mitter instability may result. This method can also be
used to reduce the transmission range and power consumption.
Another method commonly used to achieve attenuation, particularly at
higher levels, is the use of a T-pad attenuator. A T-pad is a network of three
resistors that allows for variable attenuation while maintaining the correct
match to the antenna. It is usually prudent to allow space for the addition
of a T-pad. An example of a T-pad attenuator layout is shown in the figure
below. For further details on T-pad attenuators, please refer to Application
Note AN-00150.
CIRCUIT
TYPICAL LAYOUT
WITH PROVISION FOR ATTENUATION
ANT
R1
R1
R2
PADS FOR SMD
RESISTORS
ANT
GROUND PLANE
ON LOWER LAYER
GROUND
GND
ANT OUT
Figure 14: A T-Pad Attenuator Layout Example
– 10 –
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