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Loop analysis is a tool that allows the user to arbitrarily draw a transfer function by varying the coefficient or component from the feedback block. On the other hand, curve fitting can be done by entering points of expected gain or expected phase, by pressing "Automatic Compensation", and so the coefficient of the transfer function or components will be changed to fit those points.
8.1.2 How to start Loop Analysis as a Standalone ToolBack to top
Click on "Loop & Stability" on the left main menu to start Loop Analysis.
8.1.3 Introduction to Interface (Standalone Tool)Back to top
Top Bar
Change transfer function coefficients (ai and bi)
Define the range of each coefficient for Automatic Compensation
The Generic transfer function is shown in the top bar. For other functions in the top bar, please refer to Session 9.3.7--Top bar.
8.1.3.2 Change transfer function coefficients (ai and bi)Back to top
Users can input ai and bi and set the number of parameters by setting n., where n is the order of the transfer function.
8.1.3.3 Define the range of each coefficient for Automatic CompensationBack to top
The range of ai and bi should be specified for curve fitting purpose. For coefficients which users may not want to be changed by our non-linear regression curve fitting engine, users can simply uncheck the box as shown above.
After modification, click [Automatic Compensation] to apply the new value.
Click on [Compensation Setting]. Users can set the expected Gain and Phase at different frequencies, then click [close] to close this window and click on [Automatic Compensation].
After Automatic Compensation, a non-linear regression curve fitting will change ai and bi values to fit the expected gain and expect phase to be as close as possible. The adjusted ai and bi are shown on the parameter setting interface.
On the right, users can change the fmin and fmax. Information about the gain margin, phase margin and cross-over frequency are shown on the right of the loop chart.
Users can change the expected DC gain, phase margin and cross-over frequency for automatic compensation. After the new values have been inputted, click [Apply] or [Automatic Compensation] to update.
Click on [Compensation Setting]. On the Compensation Setting page, enable [Use Advance Setting] in order to enable the input box at the bottom. Users can then set the expected Gain and Phase at different frequencies. Then, click [close] to close this window and click on [Automatic Compensation].
