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AmpH1H2 (Amplifier/Fundamental and 2nd Harmonic vs. Input Power)


Available in ADS

Name Description Units Default
Dataset Name of dataset containing data for this amplifier model None dataset.ds
G1expr Gain expression for fundamental frequency None Vout[1]
G2expr Gain expression for second harmonic frequency None Vout[2]
SP11 †† Forward reflection coefficient None polar(0,0)
SP22 †† Reverse reflection coefficient None polar(0,180)
SP12 †† Reverse transmission coefficient None 0
NF Noise figure dB None
NFmin Minimum noise figure at Sopt dB None
Sopt †† Optimum Source Reflection for Minimum Noise Figure, use x + j × y, polar(x,y), dbpolar(x,y) for complex value None None
Rn Equivalent noise resistance; must be a non-negative real number    
Z1 Reference impedance for Port1    
Z2 Reference impedance for Port2    
The gain parameters must be updated to appropriate gain expressions based on the MeasEqn expressions of AmpH1H2_Setup component which was used to create the dataset. Refer to example project AmpH1H2_prj. †† These parameters can be reported in any of the following complex number formats: x + j × y, polar(x,y), dbpolar(x,y), vswrpolar(x,y)

  1. AmpH1H2 is a data-based system model of a circuit-level amplifier. The circuit-level amplifier is characterized by a dataset generated by the extractor component AmpH1H2_Setup. Various examples of the use of AmpH1H2 are provided in the example project AmpH1H2_prj.
  2. This amplifier model does not require the explicit specification of nominal frequency at which non-linear modeling is to be performed. Although technically it can be used at any frequency during simulation, the dataset file contains the nonlinear profile at the single frequency point defined on the AmpH1H2_Setup component during extraction. Hence, effectively the AmpH1H2 model is confined to reproducing behavior accurately at that frequency only. Since the AmpH1H2 model does not have a built-in warning mechanism to detect discrepancies between simulation and extraction frequencies, the user of this model needs explicit apriori knowledge of the extraction frequency during behavioral simulation.
  3. AmpH1H2 models both odd- and even-order harmonics at the amplifier output. However, its reliance on the fundamental and second-order harmonic expressions G1expr and G2expr. respectively, guarantee high accuracy only for these two spectral components. For details of the modeling accuracy of various harmonics in a 1-tone swept power Harmonic Balance simulation, refer to the data display plot in the example project AmpH1H2_prj.
  4. The dataset contains information about the forward transmission characteristic S21. The other S-parameters S11, S12 and S22, can be set explicitly on the data model instance. Likewise, noise parameters NF, NFmin, Sopt and Rn, can be set explicitly using relevant parameters on the model instance.
  5. It is important to note that although port impedances Z1 and Z2 can be set to arbitrary values during behavioral simulation, the dataset is typically extracted at port impedance values of 50 Ohms. Ideally, the settings for Z1 and Z2 inside the subcircuit of the extractor model AmpH1H2_Setup should be set up as complex conjugates of the input and output impedances, respectively, of the circuit amplifier. The resulting dataset would then contain the behavior under matched source and load conditions. In order to translate the dataset into the behavior of AmpH1H2, the AmpH1H2 Z1 and Z2 parameters must then be set to the complex conjugates of AmpH1H2_Setup component's Z1 and Z2 values, i.e. to the original values of the circuit amplifiers port impedances.
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