LoadPullSetup (Load Pull Setup)
Symbol
Available in ADS
Parameters
| Name | Description | Units | Default |
|---|---|---|---|
| Freq | Frequency of extraction; must be a non-negative real number | GHz | 1.0 |
| Order | Order for Harmonic Balance simulation inside extractor; must be an integer greater than 0 | None | 10 |
| Pin_Start | Start value for sweep of large-signal input power; must be a real number | dBm | −50 |
| Pin_Stop | Stop value for sweep of large-signal input power; must be a real number | dBm | −20 |
| Pin_Step | Interval for linear sweep of large-signal input power; must be a positive real number | dB | 10 |
| GamAng_Start | Start value for angle of output reflection coefficient; must be a real number | deg | −180 |
| GamAng_Stop | Stop value for angle of output reflection coefficient; must be a real number | deg | 180 |
| GamAng_Step † | Interval for angle of output reflection coefficient; must be a real number | deg | 20 |
| GamMag_Start | Start value for magnitude of output reflection coefficient; must be a non-negative real number | None | 0.1 |
| GamMag_Stop | Stop value for magnitude of output reflection coefficient; must be a non-negative real number | None | 0.9 |
| GamMag_Step † | Interval for magnitude of output reflection coefficient; must be a non-negative real number | None | 0.1 |
| † Only linear sweeps using intervals of GamAng_Step, GamMag_Step are permitted using LoadAmpPull. | |||
Notes/Equations
- For amplifier designers, the AmpLoadPull and LoadPullSetup components address the issue of output match in one or more frequency bands. This is often investigated via load-pull contours indicating the load impedances that, when presented to the output of an amplifier with a given source impedance and power, cause a certain power to be delivered to the load. The LoadPullSetup component extracts an ADS dataset, given ranges and steps for input power, output reflection coefficient magnitude and output reflection coefficient angle. AmpLoadPull uses this dataset and allows fast behavioral amplifier simulations for all input power and output reflection coefficient values in the specified ranges.The use of this component is highlighted in the example project AmpLoadPull_prj.
- Although the behavioral data collected via LoadPullSetup is found using Harmonic Balance simulations, the subsequent behavioral amplifier simulations are not restricted to Harmonic Balance. In fact, the behavioral amplifier is assumed to be used for subsequent system verification (BER, ACPR etc. for Tx, Rx) within a Circuit Envelope framework. In such applications, various filters typically eliminate unwanted DC and harmonic components. Therefore, the load-pull suite was not designed to predict such components. This means that
- for a 1-tone Harmonic Balance simulation at frequency f , only the frequency component at f (fundamental) is retained. All others will be invalid or zero as they are assumed to be filtered later.
- for a 2-tone Harmonic Balance simulation at frequencies f1 and f2 (practically very close), only the frequency components at f1 and f2 (fundamentals) and those at 2 × f1-f2 and 2 × f2-f1 (intermodulation) are retained as these will be very close and cannot be assumed to be filtered. All others will be invalid or zero as they are assumed to be filtered later.
- LoadPullSetup can be pushed into for a view of the implementation. If necessary, the component can be copied and modified to suit individual needs.
- The extracted ADS dataset is assigned the name of the extraction design by default.