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About SPICE3f5

Discussion in 'CAD' started by phanic, Apr 22, 2007.

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  1. phanic

    phanic Guest

    I use spice3f5 to simulate an operation amplifier (netlist is attached
    below). I found the simulation results of spice3f5 are significantly
    difference from that of HSPICE2003sp1 ( about 1v difference, both OP
    and TRAN). What's the reason?

    * op amp
    M3 n_g_low n_g_low 0 0 nmos l=0.8u w=140u
    M4 n_d n_g_low 0 0 nmos l=0.8u w=140u
    M6 n_out n_d 0 0 nmos l=0.8u w=135u
    M1 n_g_low vin- n_source n_source pmos l=0.8u w=423u
    M2 n_d vin+ n_source n_source pmos l=0.8u w=423u
    M5 n_source n_g_hi vdd vdd pmos l=0.8u w=67u
    M7 n_out n_g_hi vdd vdd pmos l=0.8u w=32u
    M8 n_g_hi n_g_hi vdd vdd pmos l=0.8u w=2u
    Rc n_d n_RC 200
    Cc n_out n_RC 10p
    Cload n_out 0 3p
    Ibias n_g_hi 0 19u
    Vdd vdd 0 5
    Vin1 vin- 0 sin 2.5 10u 10
    Vin2 vin+ 0 2.5
    ..op
    ..tran 0.1m 1
    ..probe v(n_out)
    ..print v(n_out)
    ..model nmos nmos level=1 vto=0.7 kp=103.6u tox=20n gamma=0.298
    phi=0.688 lambda=0.03 ld=0.2u uo=600 tpg=1 rsh=40 js=0.753u nsub=8e15
    cj=271u cjsw=600p mj=0.5 mjsw=0.5 pb=0.904 cgso=692p cgdo=692p
    ..model pmos pmos level=1 vto=-0.9 kp=34.5u tox=20n gamma=0.471
    phi=0.730 lambda=0.06 ld=0.2u uo=200 tpg=-1 rsh=60 js=0.176u nsub=2e16
    cj=423u cjsw=1.2n mj=0.5 mjsw=0.5 pb=0.928 cgso=692p cgdo=692p
    ..option method=trap maxord=2
    ..end
     
  2. Jim Thompson

    Jim Thompson Guest

    Cockpit error ?:)

    What IS the 1V difference... bias differences, signal amplitude
    differences... what?

    Any error messages?

    ...Jim Thompson
     
  3. phanic

    phanic Guest

    Both bias and signal amplitude have 1v difference.
    No error message.
     
  4. phanic

    phanic Guest

    Both bias and signal amplitude have 1v differnce.
    There are no error messages.
     
  5. I thought most sub-micron models used BSIM.
     
  6. Jim Thompson

    Jim Thompson Guest

    Yes. BSIM3v2 and BSIM3v3 are the most common, but the "EKV" model is
    coming into use fast.

    ...Jim Thompson
     
  7. I had a crash course in EKV with Eric Vittoz at EPFL. Thought it was
    more a "hand-calculation" thing than a simulation model.
     
  8. Jim Thompson

    Jim Thompson Guest

    I've not used it yet, but the proponents are claiming performance
    close to sliced bread ;-)

    ...Jim Thompson
     
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