Closed-loop gain
= Closed-loop gain
{title2=$A_{\rm cl}=A/(1+A\beta)$}
The <closed-loop gain> is the input-to-output transfer after closing the feedback connection. In the elementary noninverting voltage model it tends to $1/\beta$ for large stable <loop gain>, rather than retaining the uncertain <open-loop gain> $A$. A frequency-dependent transfer must be checked for stability before that approximation is used.