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14.Estimate the maximum amount of gain that could be provided by the DUT, and as a result,
the maximum amount of power that could be received by Test Port 2 when the DUT is in
compression. For example; if a DUT with a maximum gain of +10 dB receives an input of
+10 dBm, the maximum amount of power that could be received by Test Port 2 is +20 dBm.
An isolator or attenuator may be require depending on the amount of power at Test Port 2.
For Port 2 isolators and attenuator connections, an isolator is place between the CPLR THRU
and SOURCE OUT as shown in
Figure 27
Isolators and Attenuator Connections
RCVR A IN
CPLR ARM
Fix Attenuator
SOURCE OUT
CPLR THRU
RCVR R1 IN
Booster Amplifier
RF
INPUT
15.Calculate the amount of attenuation needed between the analyzer's coupler and receivers,
so that you do not exceed the optimum receiver power level of –12 dBm.
It will be necessary to take the following into consideration:
•
Receiver A will be coupled to the analyzer RF path that could receive power
reflections as high as +10 dBm.
•
Receiver B will be coupled to the analyzer RF path that could receive a maximum of
+20 dBm from the DUT.
•
Analyzer coupler loss is –13 dB.
•
The optimum receiver power level is –12 dBm.
With the previous points in mind, the amount of attenuation can be calculated from the
following equations:
Receiver Attenuator A
Receiver Attenuator B
N5245-90002 User's and Service Guide
Example: Making High Power Measurements With Option H85
Figure
27.
Fix
Attenuator
RF
OUTPUT
Coupler
Arm
20 dB
Coupler
Coupler
Main
Output
=
+
10dBm 13dBm
–
=
+
20dBm 13dBm
–
RCVR B IN
CPLR ARM
Fix Attenuator
SOURCE OUT
CPLR THRU
In
Out
Isolator
–
–
12dBm
Attenuator A
–
–
12dBm
Attenuator B
N5244/45AS Option H85
=
+
10dBm
=
+
20dBm
31
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