Adding A Matching Circuit - Agilent Technologies ENA Series User Manual

Measurement Examples
Measuring an Unbalanced and Balanced Bandpass Filter
Step 3. Turn on the port reference impedance conversion function.
Setting Description
Port reference impedance conversion: ON
The reference impedance of the command mode of port 2 on the DUT is set to 50 W. The
impedance of the differential mode of that port may be set and modified independent of
setting the two port reference impedances before balanced conversion. For more
information, see "Converting reference impedance of balanced port" on page 165.
Figure 14-30 shows the results of port reference impedance conversion.
Figure 14-30 Results of Port Reference Impedance Conversion

8. Adding a Matching Circuit

Add an inductance of 47 nH in parallel to port 2 on the DUT (balanced). It is also possible
to add a matching circuit to the port before unbalanced-balanced conversion. For more
information, see "Determining the Characteristics that Result from Adding a Matching
Circuit to a Differential Port" on page 167.
Setting Description
Selecting a matching circuit:
Shunt L - Shunt C
Inductance: 47 nH
C=0, G=0, R=0
Differential matching circuit function: ON
314
Keystroke
(Turns it
Port Z Conversion
Keystroke
(or -
Return Fixture Simulator
-
Diff. Matching Select Circuit
L-Shunt C
-
L
(checks that , , and have been set to
C G R
(Turns it .)
Diff. Matching ON
.)
ON
) -
-
Shunt
.)
0
Chapter 14