Advantages
- This model is useful because it completely characterizes feedback amplifiers, including loading effects and the bilateral properties of amplifiers and feedback networks.
- Often feedback amplifiers are designed such that the return ratio is much greater than unity. In this case, and assuming the direct transmission term is small (as it often is), the gain of the system is approximately equal to the asymptotic gain G∞.
- The asymptotic gain is (usually) only a function of passive elements in a circuit, and can often be found by inspection.
- The feedback topology (series-series, series-shunt, etc.) need not be identified beforehand as the analysis is the same in all cases.
Read more about this topic: Asymptotic Gain Model
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