Community PCB Design & IC Packaging (Allegro X) PSpice equation in pspice

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equation in pspice

STAVEX

Hello and sorry for my English

I try to make a simulation for the rompe and weizel law , who has this equation:

 

The d=0.000766 and the a=0.00015

I try to simulate that with a G source and write the equation like that 

{0.000766/(SQRT(2*0.00015*(STD(PWR(I(R3),2)))))}

(STD because i saw that the integral in pspice is STD in a manual that i found)

but its an error, specifically :

ERROR -- Expression - use previously defined parameters only

What is wrong with that;

The I(R3) in the current from the all ready existing resistance.

  • 0

    The integral function is SDT() not STD() and if you want to use integral function in probe window, it is S()

  • 0 in reply to AyushD

    Thank you very much for the response, I hadn't seen that I had written it wrong but even though I made the change you said, an error continues to appear.

    ERROR -- Expression - use previously defined parameters only

    The problem is probably with I(R3). I am also sending you the entire error.

    **** INCLUDING rlc2-SCHEMATIC1.net ****
    * source RLC2
    L_L3 N125269 N125489 54.8nH
    R_R1 N124840 N124728 300
    L_L1 0 N125107 2uH
    L_L2 N124728 N125269 6nH
    V_V2 N124487 0
    +PULSE 0 1 0n 0.1n 0.1n 0.5u 20m
    R_R3 N159887 N219115 255
    C_C4 N125107 N125489 3.3p
    C_C3 N125107 N125269 2.24p
    C_C2 0 N125107 10p
    V_V3 N137237 0
    +PULSE 0 1 0n 0.1n 0.1n 0.5u 20m
    V_V1 N124616 0 2000Vdc
    C_C1 0 N124840 150p
    G_G1 N219115 N218614 N218614 N125107 1
    X_S2 N137237 0 N125489 N152667 SCHEMATIC1_S2
    V_V4 N159887 N152667
    +PULSE 2000 0 0n 0.1n 0.1n 5u 20m
    R_R2 N125107 N218614 2.13
    X_S1 N124487 0 N124616 N124728 SCHEMATIC1_S1
    .PARAM I_INT={PWR(I(R3),2)} R_ark={0.000766/(SQRT(2*0.00015*(SDT(I_INT))))}
    --------------$
    ERROR -- Expression - use previously defined parameters only

  • 0 in reply to STAVEX

    "Parameters can be constants, or expressions involving constants, or a combination of these, and they can include other parameters." So, Parameters cannot contain variables, hence the error.

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