Feedback sign
Feedback sign to determine the closed-loop gain and phase characteristics of the linear
system, computed during simulation.
To determine the feedback sign, check if the path defined by the linearization inputs and
outputs include the feedback Sum block:
- If the path includes the Sum block, specify positive feedback.
- If the path does not include the Sum block, specify the same feedback sign as the Sum
block.
For example, in the aircraft model, the Check Gain and Phase Margins block includes the
negative sign in the summation block. Therefore, the Feedback sign is positive.
Settings
Default: negative feedback
negative feedback
Use when the path defined by the linearization inputs/outputs does not include the
Sum block and the Sum block feedback sign is -.positive feedback
Use when:- The path defined by the linearization inputs/outputs includes the Sum block.
- The path defined by the linearization inputs/outputs does not include the Sum
block and the Sum block feedback sign is +.
Command-Line Information
Parameter: FeedbackSign
Type: character vector
Value: '-1' | '+1'
Default: '-1'
See Also
Plot Linear Characteristics of Simulink Models During Simulation on page 2-82
“Verify Model at Default Simulation Snapshot Time” on page 14-6
Nichols Plot