Transfer function

 The tool – Transfer function, is used by clicking on the Transfer function button, located in the Common section of the Tools tab (Fig. 1):

Fig. 1 Transfer function

This tool is used to analyze and evaluate the performance of electronic devices. It shows how the amplitude and phase of the output signal changes as the input signal frequency changes. This allows one to understand how the device responds to different frequencies and identify potential distortions or performance issues.

1.  Setting up a schedule

 The output graph is configured by setting the parameters shown in Fig. 2:

Fig. 2 Graph parameters

Parameter name	Default value	Description
Title	-	Text field, up to 50 characters
Gain factor	1	Supports fractional values, units of measurement - linear coefficient
Numerator coefficients	0;1	Input format: numbers separated by semicolons, for example: 1; 0.5; -0.2
Denominator coefficients	1;1	Input format: numbers separated by semicolons, for example: 1; 0.5; -0.2
Start Frequency, Hz	0.1	Numeric field, minimum value: 0.01 [Hz]
End Frequency, Hz	100	Numeric field
Add signal	inactive	Button for adding graphs Transfer function

Hint

The Add signal button located below the chart parameters table becomes active Add signal after all fields are filled in

2.  Errors when entering parameters

Cause of occurrence	Action	Message
Exceeded the allowed number of characters in the input field [Title]	An error is displayed below the field, the Add signal button is inactive	Exceeded the allowed number of characters
Required fields are not filled in	An error is displayed below the field, the Add signal button is inactive	Required
Attempt to add a curve with the same name in the Title(#title4) field	An error is displayed below the field, the Add signal button is inactive	A curve with this name already exists
All numerator coefficients = 0	A warning is displayed below the field, the Add signal button is active	At least one coefficient ≠ 0
All denominator coefficients = 0	An error is displayed below the field, the Add signal button is inactive	The denominator cannot be zero
If the numerator coefficients or denominator coefficients are incorrect (e.g. letters, extra characters)	An error is displayed under the field/fields, the Add signal button is inactive	Incorrect format
Start Frequency or End Frequency \(\leq \) 0	An error is displayed under the field/fields, the Add signal button is inactive	The frequency cannot be zero The frequency cannot be negative
End Frequency \(\geq\) Start Frequency	An error is displayed below the field, the Add signal button is inactive	End frequency cannot be less than start frequency

3.  Adding a signal

 When you click the Add signal button, the system:

• Constructs a Transfer function based on the entered data (see Fig. 3 below).

• Adds a new signal to the existing chart (if it is already displayed).

• Displays the signal name in the list next to the graph.

Note

• If you edit any parameters other than the name in an already added signal, then in order to apply these changes you must:

1. Select LMB, to the right of the graphs, a signal (function) to change;

2. Make any changes to the parameters (except the name) to the left of the graphs;

3. Click on the Update button (see Fig. 4 below).

• If you edit the name of an already added signal, then after clicking on the Add signal button, a new signal is added (see Fig. 5 below).

Fig. 3 Example of constructing Transfer function

Fig. 4 Example of updating changes in signal parameters

Fig. 5 Example of adding a second signal

Note

New signals are displayed to the right of the charts.

4.  Signal management

• You can switch between signals by clicking on their function, located to the right of the graphs, LMB.

• The signal can be hidden from the charts by clicking on the button next to the function.

• The signal can be deleted by clicking on the button next to the function.

Note

After deletion, the chart is updated to exclude the deleted signal.

5.  Schedule management

Hint

Each curve (signal) has a unique line color that is automatically assigned when added.

 The chart is controlled using a panel that appears in the upper right corner of the chart when you hover the cursor over the chart itself (Fig. 6):

Fig. 6 Chart control panel

Button	Function name	Description
	Rese views	Return to fixed axis values
	Autoscale	Adjusts the chart to the current data
	Zoom in	Approximation of the schedule
	Zoom out	Removing the schedule
	Pan	Allows you to move the graph within the canvas
	Zoom	Allows you to zoom in on the graph in the selected area
	Download plot	Allows you to save the graph in SVG format
	Download CSV	Allows you to download a CSV file (table with columns: Frequency [Hz], Amplitude [dB], Phase [deg])

Note

Data is exported only for visible signals