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Nexxim Design Examples >
Nexxim RF Design Examples >
Nexsys Timestep Example >
Second Loop Filter Schematic Analysis

Second Loop Filter Schematic Analysis

Open the second loop filter project from its file in the Examples directory.

1. On the File menu, select Open Examples. The File Open window appears.

2. Open the RF_Circuit directory, then the System directory,then select the file Loopfilter_2_NX.adsn. Click Open.

The filter schematic appears in the design window:

The System RCONST sampled source has been replaced with a Nexxim PWL source (V11) and a System Sampler element (SAMPLER). The Nexxim source has been set to provide a constant 2V waveform, and the SAMPLER element samples at the 52MHz sample rate.

Note

The SAMPLER element is required for a successful Nexxim simulation of this circuit. Without the sampler, Nexxim will report an error.

3. Expand the loopfilter_2 project tree, and double-left-click on the Transient analysis icon. Now the times are Step=0.1ns and Stop=20μs, and these values now affect the simulation. The Nexxim time steps vary, with an initial step size of 0.1ns.

4. Right-click on the Transient analysis icon and select Analyze from the menu. The Progress window displays a red line to show the analysis as it runs.

5. Click on the Results icon and double click on SP_Out to see the results:

Now the time of 20 microseconds is derived from the Transient analysis setup. The result is the same as the previous one.

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