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Nexxim Simulator >
Nexxim Oscillator Analysis >
Running Oscillator Analysis from the Netlist Editor

Running Oscillator Analysis from the Netlist Editor

If you use the Netlist Editor to create a design, the netlist should contain the information for running the oscillator analysis. No Solution Setup is required.

1. Add one oscillator probe to the circuit for each unknown frequency to be calculated. Set the parameters on each probe to specify an initial guess for the unknown frequency (FREQ parameter) and an initial voltage to be used in the calculations (A parameter). See Using the Oscillator Probe for more information

2. Run the simulation:

• On the Circuit menu, click Analyze with Nexxim. If the circuit is set up correctly, the analysis begins immediately and a red progress bar appears.

• If the analysis is not successful, check the Message Window for an explanation, and then take corrective action.

3. Display results of oscillator analysis:

• 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):
Lowest oscillation frequency is 2.28514e_006 Hz (9:15 AM May 20, 2005)

The frequency value will be the one calculated for your circuit, and the time and date will 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.

4. If the .OSC statement in the netlist includes phase noise analysis, you can display the results of the phase noise analysis on a graph. Perform the following steps:

1. 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.

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

3. Select the Noise Output category. The output quantities specified in the NOISE_OUTPUT entry in the .OSC statement that defined the phase noise analysis are available for selection. For most noise analyses, select dB as the function (the report will use 10log₁₀(magnitude) on the Y-axis). Click Add Trace.

4. Repeat the previous bullet until all desired quantities have been selected, and then click Done. A Report window opens to display a graph of the analysis results.

5. 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 click the Log radio button (deselecting the Linear button). Click OK to close the dialog.

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

• If the X-axis units are not as desired, double click on the X-axis to open the X-Axis Properties dialog. Select the Scaling tab, and deselect the Autounits radio button. Select new Unit, Field Width, and Precision values until the X-axis is as desired. Click OK to close the dialog.

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

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