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UG-1825
MAGNITUDE AND PHASE RESPONSE MEASUREMENTS USING A FOUR-PORT
NETWORK ANALYZER
MEASURING THE MAGNITUDE AND PHASE OF
THE I-CHANNEL
To measure the magnitude and phase of the I-channel using a
four-port network analyzer (see Figure 3), take the following
steps:
1.
Use an SMA cable to connect J1 of the EVAL-
ADAQ8088EBZ to Port 1 of the network analyzer.
2.
Use an SMA cable to connect J2 of the EVAL-
ADAQ8088EBZ to Port 2 of the network analyzer.
3.
Use an SMA cable to connect J7 of the EVAL-
ADAQ8088EBZ to Port 3 of the network analyzer.
4.
Use an SMA cable to connect J5 of the EVAL-
ADAQ8088EBZ to Port 4 of the network analyzer.
5.
Set the network analyzer output, Port 1 and Port 2, to a
power level of −20 dBm (63 mV p-p).
6.
Observe the output phase on Port 3 and Port 4 of the
network analyzer.
Figure 3. Four-Port Network Analyzer (E5071C Model)
MEASURING THE MAGNITUDE AND PHASE OF
THE Q-CHANNEL
To measure the magnitude and phase of the Q-channel using
a four-port network analyzer (see Figure 3), take the following
steps:
1.
Use an SMA cable to connect J4 of the EVAL-
ADAQ8088EBZ to Port 1 of the network analyzer.
2.
Use an SMA cable to connect J3 of the EVAL-
ADAQ8088EBZ to Port 2 of the network analyzer.
3.
Use an SMA cable to connect J8 of the EVAL-
ADAQ8088EBZ to Port 3 of the network analyzer.
4.
Use an SMA cable to connect J6 of the EVAL-
ADAQ8088EBZ to Port 4 of the network analyzer.
5.
Set the network analyzer output, Port 1 and Port 2, to a
power level of −20 dBm (63 mV p-p).
6.
Observe the output phase on Port 3 and Port 4 of the
network analyzer.
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EVAL-ADAQ8088EBZ
CALIBRATION PROCEDURE
First ensure that the four-port network analyzer is calibrated
using either the ECal (electronic calibration) module, or the
manual short, open, and load method. When the network
analyzer is calibrated using one of these two methods, take
the following steps to complete the network analyzer through
calibration:
1.
Use an SMA cable to connect a through connector from
Port 1 to Port 3 of the network analyzer.
2.
Use an SMA cable to connect a through connector from
Port 2 to Port 4 of the network analyzer.
3.
Press the Cal button on the network analyzer.
4.
Click Calibrate > Response (Thru) > Select Ports on
the network analyzer, and then take the following steps
to start calibration:
a.
Select 3-1 and click Thru on the network analyzer
to start the calibration on Port 3 and Port 1.
b.
When the calibration on Port 3 and Port 1 is
complete, select 4-2 and click Thru on the network
analyzer to start calibration on Port 4 and Port 2.
5.
Use an SMA cable to connect a through connector from
Port 1 to Port 4 of the network analyzer.
6.
Use an SMA cable to connect a through connector from
Port 2 to Port 3 of the network analyzer.
7.
Press the Cal button on the network analyzer.
8.
Click Calibrate > Response (Thru) > Select Ports on
the network analyzer, and then take the following steps
to start calibration:
a.
Select 4-1 and click Thru on the network analyzer
to start the calibration on Port 4 and Port 1.
b.
When the calibration on Port 4 and Port 1 is
complete, select 3-2 and click Thru on the network
analyzer to start calibration on Port 3 and Port 2.
Rev. 0 | Page 4 of 12
User Guide
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