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Nexxim Simulator >
Nexxim Oscillator Analysis >
Running Resonant Frequency Search from the Schematic Editor

Running Resonant Frequency Search from the Schematic Editor

The Resonant Frequency Search performs a modified form of oscillator analysis to obtain an initial estimate of the resonant frequency of the circuit. From the Schematic Editor, perform the following steps to set up and run an oscillator resonant frequency search, and view the results.

1. Set up the schematic circuit for oscillator analysis by inserting an oscillator probe between two nodes in your circuit. Edit the probe properties and specify an initial guess for the frequency (FREQ parameter) and an initial voltage (A parameter). See Using the Oscillator Probe for more information.

2. Right-click on the Analysis menu in the Project window to open a menu.

3. Select Add Nexxim Solution Setup from the menu, then slide the cursor to select Oscillator Analysis (N-Tone) from the subordinate menu.

4. The Oscillator Resonant Frequency Search dialog opens:

5. Type an Analysis Name (or accept the default name, for example “OscResonantFrequency”).

6. For most simulations, leave the Disable box unselected (the default setting). Selecting this box lets you store multiple solution setups for later use. (Note that if a solution setup is disabled before the analysis is run, any changes made to the design will invalidate the simulation results.)

7. Click the Edit button to change the number of tones, the frequencies of the tones, and the maximum harmonic numbers to use for each tone. These settings are reflected in the .OSC statement in the netlist.

8. Use the fields in the Frequency Sweep panel to set the parameters for the initial guess, which always uses the frequency sweep method. The settings in this panel generate .OPTIONS statements in the netlist.

9. To add a sweep, use the fields in the Sweep Variable panel.

• In the Sweep Variable area, click Add, and the Add/Edit Sweep dialog box appears.

• In the Variable list, select Temp or the name of a variable (when a variable has been defined for the design), and then select one of the following: Single value, Linear step, Linear count, Decade count, or Octave count.

• Type the sweep values into the Value text box (for Single value), or into the Start, Stop, and Step text boxes (for Linear, Decade, or Octave count), and make sure that the appropriate units are selected for each.

• For details on sweeps, see Variable Sweep.

• Click Add, and then click OK to close the Add/Edit Sweep dialog box.

• The Oscillator Resonant Frequency Search dialog box reappears.

10. Click Run to run the analysis directly from the dialog.

• If the analysis is successful, Nexxim displays plots of the real and imaginary parts of the probe current. The estimated resonant frequency occurs where the imaginary part of the probe current is zero. This estimated resonant frequency is displayed in the Resonant Frequencies field at the top of the Report.

• After a successful analysis, you can check Add Report to Project Tree to save the plot under the Results icon in the Project tree. The report is added when the setup dialog is closed with the Finish button.

11. Click Finish to add the solution setup (and the results if selected) to the Project tree and exit the dialog. You can then run the analysis again by clicking on it and selecting Analyze from the menu.

12. To run the Resonant Frequency Search analysis from the Project tree:

• Locate the resonant frequency analysis setup icon under the Analysis icon on the Project Tree. Click the resonant frequency analysis setup icon and select Analyze from the menu. The analysis begins immediately and a red progress bar appears.

• If the analysis is not successful, an error message appears in the Message Window. Check the Message Window for an explanation, and then take corrective action.

13. View results:

• After a successful oscillator analysis, Nexxim displays a message like the following in the Message Window, near the end of the messages:

[info]analysis:osc_analysis(status):
Best chance for oscillation detected at 2.28514e_006 Hz (9:15 AM May 20, 2005)

The frequency value is the one calculated for your circuit, and the time and date show the time of the analysis on your machine.

Note

As analysis progresses, oscillator analysis may display messages like the following:

analysis:osc(status): Probe 0: selecting (node_name1,node_name2) as alternative location 1.

analysis:osc(status): Probe 0: selecting (node_name3, node_name4) as alternative location 2.

The node_names are circuit-specific. If oscillator analysis fails, Nexxim automatically reruns the analysis after moving the probe to alternative location 1. If that analysis fails as well, Nexxim retries using alternative location 2.

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