84 Chapter2
Making Measurements
Example 7: Stimulus-Response Measurements
Example 7: Stimulus-Response Measurements
What Are Stimulus-Response Measurements?
Stimulus-response measurements require a source to stimulate a
device under test (DUT), and a receiver to analyze the
frequency-response characteristics of the DUT. Characterization of a
DUT can be made in terms of its transmission or reflection parameters.
Ripple, flatness, and rejection are examples of transmission
measurements. A typical reflection measurement is return loss.
A spectrum analyzer combined with a tracking generator forms a
stimulus-response measurement system. With the tracking generator
as the swept source and the spectrum analyzer as the receiver,
operation is analogous to a single-channel scalar network analyzer.
Because the tracking generator is a narrow-band system, its output
frequency must be made to track the spectrum analyzer input
frequency precisely, resulting in a wide dynamic range. This wide
dynamic range will be illustrated in the following example.
Figure 2-29 Block Diagram of a Spectrum Analyzer and Tracking Generator
System
Spectrum Analyzer Functions Used
The following procedure describes how to use the 8560E/EC Option 002
spectrum analyzer with built-in tracking generator system to measure
the rejection range of a bandpass filter, which is a type of transmission
measurement.
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