Chapter 13 97
Using Option BBA Baseband I/Q Inputs
Baseband I/Q Measurement Overview
Baseband I/Q Measurement Overview
The Baseband I/Q functionality is a hardware option, Option BBA. If
the option is not installed in the instrument, the I/Q functionality
cannot be enabled.
The Baseband I/Q option provides four input ports and one Calibration
Output port. The input ports are I, I-bar, Q, and Q-bar. The I and I-bar
together compose the I channel and the Q and Q-bar together compose
the Q channel. Each channel has two modes of operation:
Single Ended
(unbalanced) In this mode, only the main port (I or Q) is used and the
complementary ports (I-bar or Q-bar) is ignored. The I
and Q ports are in single-ended mode when Differential
“Off” is selected.
Differential
(balanced) In this mode, both main and complementary ports are
used. To activate this mode, select Differential “On”
from the I and Q Setup softkey menus.
The system supports a variety of input passive probes as well as the
Agilent 1153A active differential probe using the infinimax probe
interface.
NOTE To avoid duplication, this section describes only the details unique to
using the baseband I/Q inputs. For generic measurement details, refer
to the previous “Making Measurements” sections.
To make measurements using baseband I/Q Inputs, make the following
selections:
Step 1. Select a measurement that supports baseband I/Q inputs.
Step 2. Select the I/Q Path
Press
Input/Output, I/Q, I/Q Path. Select from the choices present on the
screen. The path selected is shown at the top of the measurement
screen.
Step 3. Select the appropriate circuit location and probe(s) for measurements.
For details see ““Selecting Input Probes for Baseband Measurements”
on page 104” in the Concepts chapter.
Step 4. Select baseband I/Q input connectors.
Step 5. If you have set the I/Q Path to
I+jQ or to I Only, press I Setup.
A. Select whether Differential (Balanced) inputs is On or Off.
B. Select the input impedance, Input Z.
To Next Page
Loading...
