Agilent Technologies E5070B, User Manual

Page: 290 / 769

284 Chapter 7
Fixture Simulator
Overview of Fixture Simulator
Balance-unbalance conversion (option 313, 314, 413, or 414)
A function that uses software to convert the measurement results in an unbalanced DUT
state, which are obtained by connecting the DUT to the test port of the E5070B/E5071B,
into measurement results in a balanced state. Two test ports of the E5070B/E5071B are
connected to one balanced port of the DUT.
For the setup procedure used for balance-unbalance conversion, see “Evaluating Balanced
Devices (balance-unbalance conversion function)” on page 293.
Functions for balanced port (option 313, 314, 413, or 414)
The following two functions are applied to a balanced (differential) port converted by
balance-unbalance conversion.
Differential port impedance conversion
A function for converting the differential mode port impedance of a balanced port after an
balance-unbalance conversion. Balance-unbalance conversion automatically converts the
differential mode port impedance at the balanced port into 2Z0 and the common mode port
impedance into Z0/2, compared with the two pre-conversion port impedances of Z0.
Differential port impedance conversion further converts a differential port impedance after
balance-unbalance conversion into an arbitrary port impedance.
For the setup procedure used for differential port impedance conversion, see “Converting
Reference Impedance of Balanced Port” on page 300.
Differential matching circuit embedding
A function for converting the measurement results obtained from balance-unbalance
conversion into a characteristic under the condition of inserting a matching circuit in the
balanced port.
For setup procedure of differential matching circuit embedding, see “Determining the
Characteristics that Result from Adding a Matching Circuit to a Differential Port” on
page 303.