The transfer function for a simple closed-loop system with negative feedback is given by:
1
\(\frac{{G\left( s \right)}}{{1 + \left( {G\left( s \right)H\left( s \right)} \right)}}\)
2
\(\frac{{G\left( s \right)}}{{1 - \left( {G\left( s \right)H\left( s \right)} \right)}}\)
3
\(\frac{{H\left( s \right)}}{{1 + \left( {G\left( s \right)H\left( s \right)} \right)}}\)
4
\(\frac{{H\left( s \right)}}{{1 - \left( {G\left( s \right)H\left( s \right)} \right)}}\)