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The asymptotic gain model is a representation of the gain of negative feedback amplifiers given by the asymptotic gain relation:
where T {\displaystyle T} is the return ratio with the input source disabled , G∞ is the asymptotic gain and G0 is the direct transmission term. This form for the gain can provide intuitive insight into the circuit and often is easier to derive than a direct attack on the gain.
Figure 1 shows a block diagram that leads to the asymptotic gain expression. The asymptotic gain relation also can be expressed as a signal flow graph. See Figure 2. The asymptotic gain model is a special case of the extra element theorem.
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