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IL300 Analog Optoisolator model problem

Discussion in 'CAD' started by Johnson, Jul 8, 2005.

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  1. Johnson

    Johnson Guest

    Cut n' Paste -- but I I am having problems getting my simulator to accept
    the TABLE for controlling the VCVS -- from a spice library


    ****************************************************************************
    ***
    * A - Anode of LED
    * C - Cathode of LED
    * A1 - Anode of photodetector 1
    * C1 - Cathode of photodetector 1
    * A2 - Anode of photodetector 2
    * C2 - Cathode of photodetector 2
    * K1 - Servo gain
    * K2 - Forward gain
    * K3 - Transfer gain
    ..Subckt IL300 A C A1 C1 A2 C2 PARAMS: K1=0.007 K2=0.007 K3=1
    * IL300 from Siemens * RAP 5/97
    DLED A E Demit
    VE E C 0
    E2 D1 0 TABLE ; {Ip2 vs IF}
    + {(0.955414823*0.999409809^(1/(abs(I(VE))+0.1p))*I(VE)^0.963133681)}
    + (0,0) (1,1)
    Rdly1 D1 D2 1K
    Cdly1 D2 0 0.17N
    Rdly2 D2 D3 1K
    Cdly2 D3 0 0.17N
    Gdly1 C1 A1 VALUE {K1*V(D3)}
    D1 A1 C1 Dtect
    RD1 A1 C1 15G
    Gdly2 C2 A2 VALUE {K3*K2*V(D3)}
    D2 A2 C2 Dtect
    RD2 A2 C2 15G
    ..model Demit D IS=1.51E-16 N=1.495822 RS=2.624361 BV=5 IBV=1U
    + CJO=15P VJ=1 M=0.5 EG=1.424 TT=500N
    ..model Dtect D IS=0.5p N=1 RS=0.001 BV=50 IBV=1U
    + CJO=14P VJ=0.159621 M=0.344264 EG=1.11 TT=10N
    ..ends
    *$
    ****************************************************************************
    ***
     
  2. Johnson,
    It's a native PSpice model. LTspice can run it, but you need to
    change the "^" to "**" because LTspice understands "^" to be
    Boolean XOR instead of exponentiation. Below is the model
    running in a simple netlist in LTspice.

    --Mike

    *
    X1 A C A1 C1 A2 C2 IL300
    V1 1 0 PULSE(-5 5 0 10n 10n 5u 10u)
    R1 1 A 1K
    R2 1 A1 1K
    R3 1 A2 1K
    V2 2 0 5
    R4 2 C 1K
    R5 2 C1 1K
    R6 2 C2 1K

    ..Subckt IL300 A C A1 C1 A2 C2 PARAMS: K1=0.007 K2=0.007 K3=1
    DLED A E Demit
    VE E C 0
    E2 D1 0 TABLE ; {Ip2 vs IF}
    + {(0.955414823*0.999409809**(1/(abs(I(VE))+0.1p))*I(VE)**0.963133681)}
    + (0,0) (1,1)
    Rdly1 D1 D2 1K
    Cdly1 D2 0 0.17N
    Rdly2 D2 D3 1K
    Cdly2 D3 0 0.17N
    Gdly1 C1 A1 VALUE {K1*V(D3)}
    D1 A1 C1 Dtect
    RD1 A1 C1 15G
    Gdly2 C2 A2 VALUE {K3*K2*V(D3)}
    D2 A2 C2 Dtect
    RD2 A2 C2 15G
    ..model Demit D IS=1.51E-16 N=1.495822 RS=2.624361 BV=5 IBV=1U
    + CJO=15P VJ=1 M=0.5 EG=1.424 TT=500N
    ..model Dtect D IS=0.5p N=1 RS=0.001 BV=50 IBV=1U
    + CJO=14P VJ=0.159621 M=0.344264 EG=1.11 TT=10N
    ..ends

    ..tran 50u 50u
    ..probe
    ..end
     
  3. Jim Thompson

    Jim Thompson Guest

    [snip]

    PSpice considers "^" to be Boolean XOR as well. The model probably
    originated with SmartSpice, or of that ilk.

    ...Jim Thompson
     
  4. Johnson

    Johnson Guest

    Thank you both.

    Jack
     
  5. Jim,
    I wish it true because it's one of the few incompatibilities
    between LTspice and PSpice that I can't change without breaking
    models already using "^" as XOR. But in this ABM context,
    PSpice uses "^" as exponentiation instead of XOR. Here's an
    example to illustrate:

    *
    V1 1 0 PULSE(0 2 0 .5m .5m 1u 1.002m )
    E1 2 0 value { 2 ^ V(1) } ; LTspice: XOR, PSpice: exponentiation
    E2 3 0 value { 2 ** V(1) } ; LTspice & PSpice: exponentiation
    ..tran 3m 3m
    ..probe
    ..end

    Regards,

    --Mike
     
  6. Jim Thompson

    Jim Thompson Guest

    Mike, The old-style Microsim Schematics, which I use, rejects "^", but
    I can manually get PSpice itself to run a netlist with "^" in it as
    exponentiation.

    The manual lists "^" as XOR, but I've not tried it... I only use the
    canned digital parts ;-)

    Also, the manual only lists "**" for exponentiation. Maybe "^" is a
    legacy holdover that PSpice can handle simply because it's pretty easy
    to recognize logical operations as opposed to Algebraic.

    ...Jim Thompson
     
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