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Model X3C09E2-20
Rev A
IL therm = 10 ? log 10 ?
? P
?
?
?
? out ( CPL )
P in
+ P out ( DC ) + P out ( ISO ) + P out ( RL ) ? ?
( dB )
(4)
In terms of S-parameters, IL therm can be computed as follows:
IL therm = ? 10 ? log 10 ? ? S 11 + S 21 + S 31 + S 41
?
?
2 2 2
2 ?
?
( dB )
(5)
The thermal resistance and power dissipated within the unit are then used to calculate the average total input power
of the unit. The average total steady state input power (P in ) therefore is:
Δ T
?
? 1 ? 10
?
?
?
?
? 1 ? 10
?
?
?
P in =
?
P dis
? IL therm
10
?
?
=
?
R
? IL therm
10
?
?
( W )
(6)
W here the temperature delta is the circuit temperature (T circ ) minus the mounting interface temperature (T mnt ):
Δ T = T circ ? T mnt
( o C )
(7)
T he maximum allowable circuit temperature is defined by the prop erties of the materials used to construct the unit.
Multiple material combinations and bonding techniques are used within the Xinger II product family to optimize RF
performance. Consequently the maximum allowable circuit temperature varies. Please note that the circuit
temperature is not a function of the Xinger case (top surface) temperature. Therefore, the case temperature cannot
be used as a boundary condition for power handling calculations.
D ue to the numerous board materials and mounting configurations us ed in specific customer configurations, it is the
end users responsibility to ensure that the Xinger II coupler mounting interface temperature is maintained within the
limits defined on the power derating plots for the required average power handling. Additionally appropriate solder
c omposition is required to prevent re flow or fatigue failure at the RF ports. Finally, reliability is improved when the
m ounting interface and RF port temperatures are kept to a minimum.
The power-derating curve illustrates how changes in the mounting interface temperature result in converse changes
of the power handling of the coupler.
Available on Tape
and Reel for Pick and
Place Manufacturing.
USA/Canada:
Toll Free:
Europe :
(315) 432-8909
(800) 411-6596
+44 2392-232392
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