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 AC Sweep - how to include frequency in a parameter's expression? 

Last post Wed, Feb 27 2013 1:19 AM by NickW. 1 replies.
Started by npw1 26 Feb 2013 08:37 AM. Topic has 1 replies.
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  • Tue, Feb 26 2013 8:37 AM

    • npw1
    • Not Ranked
    • Joined on Tue, Feb 26 2013
    • Posts 1
    • Points 20
    AC Sweep - how to include frequency in a parameter's expression? Reply

    Hi,

     I'm trying to specify a frequency dependent resistance (an approximation of the skin effect).

    I have a parameters include file, and need to specify the frequency within an expression (in curly brackets) as follows:

    S3_skin_tu1 = {PI*PWR(S3_r_tu1-SQRT(2*S3_res_tu1/(2*PI*FREQUENCY*u_Cu)),2)}

    However, PSpice does not understand 'FREQUENCY' (nor 'FREQ' or anything else I've tried). I've not been able to find anything in the documentation.

    Does anyone know of a way to use AC frequency in an expression?

    Any suggestions will be gratefully received!

    Regards,

    Nick

    • Post Points: 20

  • Wed, Feb 27 2013 1:19 AM

    • NickW
    • Not Ranked
    • Joined on Wed, Aug 8 2012
    • Posts 10
    • Points 125
    Re: AC Sweep - how to include frequency in a parameter's expression? Reply

    I put a frequency into the expression numerically and examined the output at that particular frequency (the output at other frequencies would now be incorrect though). Doing this told me what I needed to know.

    I may need to revisit this in the future, and it is still an interesting question! How to get 'frequency' into a parameter's expression symbolically?

    One document suggested that the AC skin effect of a conductor could be simulated by using resistors and inductors.

    Another idea is to sense the current through a 1H inductor when 1 volt is applied accross it [frequency given by 1/(2*PI*CURRENT)] but how to pass this CURRENT into an expression?

    Regards,

    Nick

    I am both NickW (home email) and npw1 (work email) - sorry for any confusion!
    • Post Points: 5
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Started by npw1 at 26 Feb 2013 08:37 AM. Topic has 1 replies.