Controller Gain Drives the Error - Electronic Circuits IX: Feedback Control and Stability Margins Step by Step

A controller gain creates a command from the checked error. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.

highlighted = computed this step

The controller input is the error

The checked error is 2 volts before the controller multiplies it.

e=2\ \text{V}

Controller gain makes a command

Gain 3 turns the error into a 6 volt command.

3\cdot 2\ \text{V}=6\ \text{V}