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The Spectrum Application (RF Measurements)
R&S
®
FPL1000
122
User Manual 1178.3370.02 ─ 11
Figure 6-20: Test setup for compression point measurement using an internal generator
The compression point is defined as the power level at which the relationship between
the input power and output power deviates from the linear trace. Various compression
points can be defined, depending on the amount of deviation. For example, the 1
dB
compression point indicates when the output power deviates from the linear response
by 1
dB.
RF Input
power
Generator
output
power
Ideal trace
Actual trace
1 dB
1 dB
compr.
point
x dB
x dB
compr.
point
Reference
point
Figure 6-21: Compression point calculation
Level offset
In an ideal measurement setup, the relation between the output power of the DUT to
the input power is linear throughout the measured power range. However, due to cable
Measurements and Results