N9069C Noise Figure Measurement Guide 47
Making Noise Figure Measurements
Using the U7227-Series USB Preamplifiers in Noise Figure Measurements
The modified DUT gain is:
dB
Use DUT NF and DUT Gain Modified values to search in
from
bottom to top. The test system configuration should be USB Internal
Internal Attenuator.
DUT with Frequency Ranges above 3.6 GHz
The DUT characteristic is as below:
DUT NF:
4 dB
DUT gain:
25 dB
Frequency range: 3 to 10 GHz
The DUT bandwidth is:
Hz
The bandwidth adjust factor is:
dB
The modified DUT gain is:
dB
Use DUT NF and DUT Gain Modified values to search in
from
bottom to top. The test system configuration should be USB Preamp only.
DUT_Gain_Modified DUT_Gain AF
–
=
24.45
=
DUT_BW
7 10
9
×
=
AF
10
=
3.59 10
9
×
DUT_BW
(
)
⁄
(
)
log
×
2.9
–
=
DUT_Gain_Modified DUT_Gain AF
–
=
27.9
=
Summary of Contents for CXA N9000B
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Page 8: ...8 Contents...
