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Ansoft Designer / Ansys Designer 在线帮助文档：

Nexxim Simulator >
Nexxim Oscillator Analysis >
   Running Phase Noise Analysis from the Schematic Editor       

Running Phase Noise Analysis from the Schematic Editor

Nexxim can calculate phase noise as part of oscillator analysis.

Set up the circuit for single-tone or multi-tone oscillator analysis as described in the topics Running Single-Tone Oscillator Analysis from the Schematic Editor and Running Multi-Tone Oscillator Analysis from the Schematic Editor. Complete the following Phase Noise setup steps before clicking Finish on the Oscillator Analysis dialog:

1. On the Oscillator Analysis dialog, select (check) the box for Enable Noise Calculation.

2. In the Noise Calculation panel, select the Harmonic Number. The Harmonic Number value selects one of the harmonics of the oscillator frequency around which to calculate the phase noise. The default is harmonic number 1 (the fundamental oscillating frequency).

3. Click the Edit button in the Noise Calculation panel to open the Noise Output dialog. Expand the icons for the nets and devices, and then use the checkboxes to select one or more outputs for noise analysis.

4. In the Sweep Variables panel, you can add a sweep of the noise frequencies to be calculated, with or without a second sweep of temperature. The swept frequencies are offsets from the calculated oscillating frequency.

•  To add a sweep of noise frequencies, select FNoi from the Variables list and click the Edit button. The Add/Edit Sweep dialog opens. Select the Single value, Linear step, Linear count, Decade count, or Octave count button, then complete the specification by filling in the numeric fields. Click the Add button to add the sweep to the Sweep Values list.

•  To add a sweep of temperature, click the Add button in the Sweep Variables panel. The Add/Edit Sweep dialog opens. Select Temp from the Variables list. Select the Single value, Linear step, Linear count, Decade count, or Octave count button, then complete the specification by filling in the numeric fields. Click the Add button to add the sweep to the Sweep Values list.

•  Click OK to close the Add/Edit Sweep dialog and return to the Oscillator Analysis dialog.

5. When all setup steps are as desired, click Finish on the Oscillator Analysis dialog. The solution setup is added to the Project tree under the Analysis icon.

6. Run the simulation:

•  Click on the solution setup in the Project tree and click Analyze from the menu. If the circuit is set up correctly, 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.

7. Display results:

•  On the menu bar, click Circuit and then click Create Report. (Alternatively, select Create Report from the Results icon in the Project Manager window.) The Create Report dialog box appears. Select Standard as the Report Type and Rectangular Plot as the Display Type. Click OK.

•  When the Report dialog box appears, select the appropriate oscillator analysis from the Solution pulldown. Select Noise from the Domain pulldown.

•  Select the Noise Output category. The output quantities you specified in the Noise Output dialog (step 3 above) are available for selection. For most noise analyses, select dB as the function. Click New Report.

•  A Report window opens to display a graph of the analysis results.

•  Double-click on the X-axis (the Fnoi axis at the bottom of the report). The X-Axis Properties dialog opens. Select the Scaling tab, and Select Log for Axis Scaling. Click OK to close the dialog.

•  The report now shows the phase noise in the common double-log format:

•  For details on creating and modifying reports, see Generating Reports and Postprocessing.

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