HP HP 8753E, User Manual, Page: 436 / 699

Figure 6-85. Diagram of Gain Compression
Figure 6-86 illustrates a simultaneous measurement of fundamental gain compression and
second harmonic power as a function of input power.
REF 10
G A I N
I
I
I
I I
I
1
S T A R T - 5 . 0
c w 2 0 0 . 0 0 0 0 0 0 STOP 1 0 . 0
N A G
R E F - 3 0
I I I I
I
I I
START
- 5 . 0
c w 2 0 0 . 0 0 0 0 0 0 STOP 1 0 . 0
Figure
Swept Power Measurement of Amplifier’s Fundamental Gain Compression and
Harmonic Output Level
In a compression measurement it is necessary to know the RF input or output power at a
certain level of gain compression. Therefore, both gain and absolute power level need to be
accurately characterized. Uncertainty in a gain compression measurement is typically less
than 0.05 Also, each input channel of the analyzer is calibrated to display absolute power
(typically within up to 3 and + 1 up to 6
Application and Operation Concepts