Agilent Technologies E4406A manual Selecting Baseband I/Q Input Impedance

Making Measurements

Using Baseband I/Q Inputs (Option B7C)

Selecting Baseband I/Q Input Impedance

The selection of input impedance is coupled to a connector “balance” configuration. “Balance” refers to whether an input is “single-ended” (unbalanced) or is balanced.

To select an input impedance, press Input/Output, I/Q Setup, I/Q Input Z to display the following choices:

•50 Ω Unbalanced - Select to use I and/or Q input connectors.

•600 Ω Balanced - Select to use either I and I, Q and Q, or all four I, Q, I, and Q input connectors.

•1 M Ω Unbalanced - Select to use I and/or Q input connectors in an unbalanced mode. When I/Q Input Z is set to a 1 M Ω selection (balanced or unbalanced), the setting for I/Q Z Ref for Input Z = 1M Ω

key may be adjusted. Otherwise, the default value for I/Q Z Ref = 1 M Ω is 50 Ω.

•1 M Ω Balanced - Select to use either I and I, Q and Q, or all four I, Q,

I, and Q input connectors to make a balanced measurement. When I/Q Input Z is set to a 1 M Ω selection (balanced or unbalanced, the

setting for I/Q Z Ref for Input Z = 1M Ω key may be adjusted. Otherwise, the default value for I/Q Z Ref = 1 M Ω is 50 Ω

You can select I only or Q only in the Input/Output, Input Port menu with any impedance selection.

Figure 4-16 I/Q Input Z Menu - Option B7C Baseband I/Q Inputs Installed

164 Chapter 4