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page27
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1983-10-04
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57 lines
RESPONSE
A. FREQUENCIES
Obviously, if we are to determine the response of a net-
work, we must supply the frequencies at which the response is
to be determined. There are two methods by which this can be
done. First, we can enter the frequencies directly by selec-
ting option 2 in the main menu. The screen will reply by ask-
ing for the first frequency. This will be echoed as the last
frequency, and the user will be asked to supply the next. At
this point, it is possible to sweep the response by entering
a step size, which must be less than or equal to the last fre-
quency displayed. This value will not be echoed, and the user
will be asked to supply another frequency. At this point, en-
ter in the last frequency to be analyzed. The program will
now take care of the sweeping. Only linear sweeping is avail-
able. Up to 20 discrete frequencies can be analyzed.
The second method is to have some optimization objectives
in memory. The exact nature of objectives is to be covered in
a later chapter, but let it suffice to say that the objective
frequencies can also be used for analysis.
B. MENU OPTIONS
After analysis has been completed, the response menu will
appear on the screen. There are 4 display options available
that pertain directly to the response of the network. Polar
S-parameters, transmission/reflection losses, and input/output
impedances may be selected.
The response S-parameters may be saved on disk, which can
later be called up as a data file. This is very useful when
modelling active devices (see the example on pages 19-21).
The user will be asked to supply a name for the file (up to 8
characters and no extender). One may escape from this mode by
simply hitting the RETURN key.
C. STABILITY ANALYSIS
Stability analysis is available in the form of stability
circles (both input and output) and Linville stability factor.
The actual analysis is performed when either of these options
is selected, and is then saved in memory for any future list-
ing. For a detailed explanation of the output, see the exam-
ple on page 21.
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