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PSPice Ftable Parameters

Daniel P

Hi there.

I'm developing a circuit in PSpice including an Impedance-model, which is simulated within a real and a complex part. Also can be looked like a Resistor and a Capacitor that change values according to varying the frecuency.

So, for example, I have:

@35kHz: R=2000; C=2.27nF or also can be modeled like 0-2000j or |Z|=2000 and Phase=-90º

... 

@39kHz: R=1550; C=2.39nF or also can be modeled like 202.32-1536.7j or |Z|=1550 and Phase=-82.5º 

 

and so on, until 45kHz (steps can be from 250Hz). 

 

When I try to insert this behavior into my Schematic, using FTABLE Part, I cannot get the right way to simulate whe whole circuit (the output I get has no-sense).

I know the circuit is well designed because if I put single values of a Resistor and a Capacitor instead of the FTABLE componet, I get a correct output. But that's not a polite solution, because I have many values for these components.

I'm trying to set up the FTABLE like this (Parameters are in Modulus and Phase Expression mode)

 

row1: 35kHz    2000         -90

row2: 38.5kHz     1650       -86.25

row3: 39kHz     1550       -82.5 

row4: 41.750kHz     2100       -88

row5: 45kHz     1800      -90 

 MAGUNITS=mag

 

What am I doing wrong? Do I need to change other parameters or settings in the FTABLE setup? Is there other way to do what I'm trying to?

Thank you in advance, any help will be much appreciated.

Regards,

D. 

 

Parents

  • Hi alokt.

    Thanks for the reply.

    I've been studing other parameters, such as EFREQ and GFREQ (better this one for modeling Impedance), and according to the manual, seems to be perfect for what I'm trying to do.

    The question is, how can I define the values table from the data I have? I had never do it before, could you please tell me how to fill it? or just an example of one sample data.

    And the other fact is, how must I connect this kind of Part in my circuit? I mean, it has 2 Inputs and 2 Outputs, and it has to be changing a R and a C in series (only one wire as Input and another one as Output).

    Hope you can help me out with this as well.

    Best regards,

    D. 

Reply

  • Hi alokt.

    Thanks for the reply.

    I've been studing other parameters, such as EFREQ and GFREQ (better this one for modeling Impedance), and according to the manual, seems to be perfect for what I'm trying to do.

    The question is, how can I define the values table from the data I have? I had never do it before, could you please tell me how to fill it? or just an example of one sample data.

    And the other fact is, how must I connect this kind of Part in my circuit? I mean, it has 2 Inputs and 2 Outputs, and it has to be changing a R and a C in series (only one wire as Input and another one as Output).

    Hope you can help me out with this as well.

    Best regards,

    D. 

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