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CH8 composition of {\fgs}

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Robin P. Clark 2013-09-17 10:18:30 +01:00
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submission_thesis/CH8_Conclusion/copy.tex
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@ -169,38 +169,42 @@ work together to perform a pre-defined function.
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The choice for {\fg} membership is made by the analyst. The choice for {\fg} membership is made by the analyst.
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The act of choosing component to comprise a {\fg} The act of choosing components to form a {\fg}
raises questions about the circuit under investigation. raises questions about the circuit under investigation.
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Ideally {\fgs} will be able to act as standalone modules. Ideally {\fgs} will be able to act as standalone modules.
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An inverting amplifier configuration, or a low pass filter are good examples of these. %That is they should perform their function in the context of teir use, but
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These have clear inputs and outputs, and are resilient to what they are connected to at An inverting amplifier configuration, or a low pass filter are good examples of these:
they have clear inputs and outputs, and are resilient to what they are connected to at
the output (in electronics terms they have high output impedance). the output (in electronics terms they have high output impedance).
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In defining members for {\fgs} he analyst is forced to consider the interfaces between elements In defining members for {\fgs} the analyst is forced to consider the interfaces between elements
of circuitry to identify modules. of circuitry to identify modules.
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This is to prevent undue influence on them from circuitry
they may be connected to.
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Consider the resistor capacitor low pass stage first looked at in example~\ref{sec:lp}. %\label{sec:lp} Consider the resistor capacitor low pass stage first looked at in example~\ref{sec:lp}. %\label{sec:lp}
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This circuit element, while applying a filtering effect, has a low output impedance. This circuit element, while applying a filtering effect, has a low output impedance.
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With a simple OpAmp buffer amplifier it becomes an effective, high impedance output, standalone module. With a simple OpAmp buffer amplifier on its output stage, it becomes an effective high impedance output standalone module.
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These two elements, the resistor capacitor low pass stage and the OpAmp
are good candidates therefore, for being considered as a standalone module, and thus a {\fg}.
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The resistor/capacitor low pass stage and the OpAmp
are good candidates therefore for being considered as a standalone module, and thus a {\fg}.
However, different analysts may choose different {\fgs} However, different analysts may choose different {\fgs}
when analysing the same circuit. when analysing the same circuit.
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This means that {\fgs} are not guaranteed to be unique. This means that {\fgs} are not guaranteed to be unique.
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This apparent anomaly is explored in the examples~\ref{sec:invamp},~\ref{sec:bubba} were different This apparent anomaly is explored in the examples~\ref{sec:invamp},~\ref{sec:bubba} where different
structure of the FMMD hierarchy are used to analyse the same circuitry. structures of the FMMD hierarchy were used to analyse the same circuitry.
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The same system level failure modes are obtained, but the more de-composed examples The same system level failure modes were obtained, but the more de-composed examples
offer better performance in terms of comparison complexity. offered better performance in terms of comparison complexity.
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Further work may be required to apply justification for the choice of the membership in {\fgs}. Further work may be required to apply justification for the choice of the membership in {\fgs}.
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