Specifications

14
Innovative
Applications
Fast and accurate
noise figure
measurements
(Option 028, 029)
continued
PNA-X’s unique source-corrected noise figure solution
• Uses modified cold-source method, eliminating need for noise source when measuring DUT
• Corrects for imperfect system source match by using vector correction to remove mismatch
errors plus an ECal module used as an impedance tuner to remove noise-parameter-
induced errors
• Maintains high measurement accuracy in fixtured, on-wafer, or automated-test environments
• Accurately measures differential devices using vector
deembedding of baluns or hybrids
DUT
Measure differential devices by
deembedding baluns or hybrids.
At each test frequency, four or more noise measurements
are made with known, non-50-ohm source impedances.
From these measurements, 50-ohm noise figure is
accurately calculated.
DUT
Test port 1
R1
Test port 2
R2
A
B
To receivers
LO
Source 2
Output 1
Source 2
Output 2
Pulse generators
REAR PANEL
1
2
3
4
+28 V
Noise receivers
10 MHz to
3 GHz
3 to
26.5 GHz
Source 1
OUT 1 OUT 2
Pulse
modulator
Source 2
OUT 1 OUT 2
Pulse
modulator
Noise source used
for calibration only
J9 J10
J11
J8
J7
J2 J1
Impedance
tuner for
noise figure
measurements
+
–
Block diagram of a two-port N5242A PNA-X with Options
200, 219, 224, and Noise Figure Option 029. A standard
ECal module is used as an impedance tuner to help
remove the effects of imperfect system source match.
N5244/45/47A models include a built-in impedance tuner.