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Frequency selective nonlinear amplifier

Question asked by WSTR on Dec 6, 2004
Latest reply on Dec 7, 2004 by WSTR

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Hi,
I would like to have an amplifier, which is frequency selective and has P1dB, IP3 ... as a replacement of an active low pass filter based on an operational amplifier. I want to use this block in HB-simulations in which I cannot use the original Spice model.
My idea: Simulating the transfer function in an AC simulation and use this data file in the filebased S21 field of the Amplifier2 block.
Is that the best way. Do you have an example?

Please let me know. Wolfram

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mfredrik Dec 7, 2004 2:25 AM
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You could do this in several ways. Here's a couple of alternatives:
- Use a AmplifierS2d component. This is a databased amplfier. In the S2D file you can specify the small signal S-parameters, plus the nonliner parameters such as P1DB. etc. Copy the template S2D file to get the format of the data file.
  There are 7 differen ways to specify the nonlinearities (GCOMP1-GCOMP7). Uncomment one of these blocks and specify your parameters.
- Use a regular Amplifier2 system apmlifier together with a DataAccess component. If you have a dataset with S-parameters for the active filetr, then you have a DataAccess component read that dataset. You can then assign the S-parameters of the Amplifer2 component to the values from the dataset, like this:
  
  S11 = file{DAC1,"S[1,1]"}
  S21 = file{DAC1,"S[2,1]"}
  S12 = file{DAC1,"S[1,2]"}
  S22 = file{DAC1,"S[2,2]"}
  
  The nonlinear parameters can then be set in the Amplifier2 component. This kind of emulates the AmplifierS2D component...
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WSTR Dec 7, 2004 6:04 PM
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Hi,
to include S-parameter is not a problem. But I want to use the transfer function of an AC simulation.

Any idea? Wolfram
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Frequency selective nonlinear amplifier

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