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Stimulus-Response
Measurements
NOTE
This application should only be performed using an HP
8591C
cable TV analyzer equipped with
Option 011.
What
Are
Stimulus-Response
Measurements?
Stimulus-response measurements require a source to stimulate a device under
test (DUT), a receiver to analyze the frequency-response characteristics
of the DUT, and, for return-loss measurements, a directional coupler.
Characterization of a DUT can be made in terms of its transmission or
reflection parameters. Examples of transmission measurements include
flatness and rejection. A 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. A narrow-band system
has a wide dynamic measurement range, but the tracking generator’s output
frequency must be made to precisely track the spectrum
anaJyzer’s
input
frequency. This wide dynamic range will be illustrated in the following
example. Figure 5-3 shows the block diagram of a spectrum-analyzer and
tracking-generator system.
5-12