Agilent Technologies ENA Series Guía de usuario Pagina 308

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302 Chapter 7
Fixture Simulator
Converting Reference Impedance of Balanced Port
Converting Reference Impedance of Balanced Port
By using the port impedance conversion function, you can specify the impedance of each
test port. As a result of this conversion, the impedance of the balanced port in differential
mode is set to a value twice as large as the impedance of the two unbalanced ports before
conversion, and in common mode to a value one-half as large (Figure 7-17).
NOTE Be sure to set the impedances of the two unbalanced ports equal to each other. For more
details on setting up port impedance for unbalanced ports, refer to “Converting the Port
Impedance of the Measurement Result” on page 288.
Figure 7-17 Port impedance after a balance-unbalance conversion
As described above, the impedance of the balanced port is automatically specified as the
result of specifying the impedance of the two unbalanced ports prior to balance-unbalance
conversion. However, the port impedance can be changed to an arbitrary value by using the
differential port impedance conversion function and the common port impedance
conversion function.
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