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Nexxim Design Examples >
Nexxim RF Design Examples >
Nonlinear Loadpull Amplifier Example >
Open the NLAMP Design

Open the NLAMP Design

The schematic for the demo and an example loadpull data file are available in the Examples directory.

Open the NL_Amplifer_Demo Schematic 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 Amplifiers directory, then select the file NL_Amplifier_Demo.adsn. Click Open.

The project contains two circuits:

3. Click on the LPD_Demo circuit. The LPD_Demo schematic appears in the design window:

NLAMP is a four terminal device. In this example, two terminals (one input and one output) are connected to ports while the remaining terminals are grounded. The value of the characteristic source impedance specified in the loadpull data file (3.07) is added as the impedance of port 1 (input port). A load impedance of (4.5758 + j0.0985) is specified as the impedance of port 2 (output port).

4. Left-click on the NLAMP element to display its property settings:

The loadpull model data file is NLAMP_demo.lpd. The source frequency is given by the project variable freq1. The frequency value is 1.96 GHz, the frequency for the loadpull data in the file. A second, slightly higher frequency given by project variable freq2 is used in two-tone harmonic balance analysis.

The model_switch is set to select the frequency domain implementation.

5. Left-click on Port 1 (PNUM=1) and select Edit Port. Near the bottom of the Edit Port dialog, select Edit Sources.

6. Select the PowerSinusoidal1 source and click Edit Properties.

The PowerSinusoidal1 source runs at a frequency given by project variable freq1 at an input power given by project variable pin.

With PowerSinusoidal1 still selected, click the Select button under Analysis list:

The PowerSinusoidal1 source runs on all analyses in the demo. Click OK to close the Select Analysis dialog.

7. Select the PowerSinusoidal2 source and click Edit Properties.

The PowerSinusoidal2 source runs at a frequency given by project variable freq2 at an input power given by project variable pin.

With PowerSinusoidal2 still selected, click the Select button under Analysis list:

The PowerSinusoidal2 source runs only on the HBnTone analysis in the demo.

Click OK to close the Edit Sources dialog, and OK again to close the Edit Ports dialog.

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