Closed-loop transfer function
A closed-loop transfer function in control theory is a mathematical expression (algorithm) describing the net result of the effects of a closed (feedback) loop on the input signal to the circuits enclosed by the loop.
An example of a closed-loop transfer function is shown below:
The summing node and the G(s) and H(s) blocks can all be combined into one block, which would have the following transfer function:
Let's define an intermediate signal Z shown as follows:
Using this figure we can write
- This article incorporates public domain material from the General Services Administration document "Federal Standard 1037C".
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