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Design Notes

Using AMP_F to Accommodate Frequency Dependent Behavioral Parameter Models as well as AM/AM and AM/PM Characteristics

This project illustrates the use of the AMP_F file-based amplifier. AMP_F can support two types of data files.

The first data format defines frequency-dependent behavioral parameters (gain, P1dB, NF, IP3, etc.). The format can also include temperature dependency, which is implemented by placing VAR temp=X at the beginning of each section of the file. The data file "AMP_Behavioral_Params" in this example includes three temperature settings. The system diagram uses the variable TEMP to define the simulation temperature and is swept using the SWPVAR block. A range of frequencies is defined in the system diagram options, under the RF Frequencies tab. The Gain and Noise Figure are measured using the RFB simulation and are plotted in graphs "Behavioral Params Gain" and "Behavioral Params NF".

The second data format defines the power-in power-out relationship, i.e., the AM/AM and AM/PM characteristics of an amplifier. This format can also account for frequency dependency, which is achieved by placing VAR FREQ = Y before each AM/AM/PM data set. The data file "AMP_Pin_Pout" in this example illustrates a device specified by its AM/AM/PM characteristics over three frequencies. The corresponding system diagram shows a different method of characterizing the device by using a VNA to sweep the power and frequency of the source and measure the device reponse. The AM-to-AM characteristic of the device is plotted in the graph "Pin Pout AM to AM" using both, RFB and time-domain measurements. AM-to-AM curves are plotted for various frequencies, as defined in the VNA.

Further information can be found in the element help for AMP_F and in the VSS Getting Started Guide.

System Diagram - Amp Model w Pin Pout Model

System Diagram - Amp Model w Behavioral Params

Graph - Pin Pout AM to AM

Graph - Behavioral Params NF

Graph - Behavioral Params GAIN