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- RESPONSE
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-
- 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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