UG-1825
EVAL-ADAQ8088EBZ
User Guide
Rev. 0 | Page 6 of 12
MEASURING THE MAGNITUDE AND FREQUENCY
RESPONSE OF THE Q-CHANNEL
Q_INP as the Active Input
To measure the magnitude and frequency response of the Q-
channel with the Q_INP input as the active input and using a
two-port network analyzer (see Figure 4), take the following
steps:
1.
Use an SMA cable to connect J4 of the EVAL-
ADAQ8088EBZ to Port 1 of the network analyzer.
2.
Leave J3 of the EVAL-ADAQ8088EBZ floating.
3.
To measure the frequency response at the Q_OUTP
output of the EVAL-ADAQ8088EBZ, take the following
steps:
a.
Use an SMA cable to connect J8 of the EVAL-
ADAQ8088EBZ to Port 2 of the network analyzer.
b.
Terminate J6 to 50 Ω.
c.
Set the network analyzer output, Port 1, to a power
level of −20 dBm.
d.
Observe the frequency response on Port 2 of the
network analyzer.
4.
To measure the frequency response at the Q_OUTP
output of the EVAL-ADAQ8088EBZ, take the following
steps:
a.
Use an SMA cable to connect J6 of the EVAL-
ADAQ8088EBZ to Port 2 of the network analyzer.
b.
Terminate J8 to 50 Ω.
c.
Set the network analyzer output, Port 1, to a power
level of −20 dBm.
d.
Observe the frequency response on Port 2 of the
network analyzer.
Q_INN as the Active Input
To measure the magnitude and frequency response of the Q-
channel with the Q_INN input as the active input and using a
two-port network analyzer (see Figure 4), take the following
steps:
1.
Use an SMA cable to connect J3 of the EVAL-
ADAQ8088EBZ to Port 1 of the network analyzer.
2.
Leave J4 of the EVAL-ADAQ8088EBZ floating.
3.
To measure the frequency response at the Q_OUTP and
Q_OUTN outputs of the EVAL-ADAQ8088EBZ, repeat
Step 3 and Step 4 of the procedure in the Q_INP as the
Active Input section.
CALIBRATION PROCEDURE
First ensure that the two-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 2 of the network analyzer.
2.
Press the
Cal
button on the network analyzer.
3.
Click
Calibrate
>
Response (Thru)
>
Select Ports
on
the network analyzer.
4.
Select
2-1
, and click
Thru
.
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