Introduction - Anritsu MS2024B Manual

Chapter 12 — Balanced Ports,
Option 77

12-1 Introduction

When equipped with Option 77, the Vector Network Analyzer is able to leverage both of its
test ports in order to measure the S-parameters of balanced and differential test
configurations. Using mathematical transformations, the Vector Network Analyzer can
convert single-ended S-Parameters into the equivalent balanced differential, common, and
mixed mode S-parameters: S
for passive measurements. Note that the Vector Network Analyzer is not simultaneously
transmitting from both Port 1 and Port 2 during this measurement. This measurement can
be used as an alternative to a sampling oscilloscope for verifying performance and
discontinuities in differential cables.
12-2 Procedure For Using Balanced Ports
With Option 77, the Vector Network Analyzer enables measurements with four additional
S-parameters: the differential reflection coefficient (S
coefficient (S ), and the mixed mode reflection coefficients (S
c1c1
S-parameters can be applied to any trace with any graph type, in the same manner as the
other standard S-parameters.
1. Press the Measure function hard key.
2. Choose the desired active trace.
3. Press the S-parameter soft key and then choose the desired S-parameter from the pop-up
list box.
4. Choose the desired Graph Type and Domain.
A full 2-Port calibration is required for balanced or differential S-parameter
Note
measurements.
Vector Network Analyzer MG
, S , S , S
d1d1 c1c1 c1d1 d1c1
PN: 10580-00289 Rev. K
. This approach provides accurate results
), the common mode reflection
d1d1
and S
c1d1
). These
d1c1
12-1