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Using SPICE level 3 MOSFET model in SPECTRE

keensport

Dear all,

I'm trying to use simple SPICE level 3 Mosfet model in Spectre, defined as:

NMOS ( KP= 1400.5  VTO=4  THETA=0  VMAX=1.5e5  ETA=0.005  LEVEL=3)

However, after a successful import, the simulated characteristic of the device in Spectre is incorrect (comparing to LTSpice, for which the original model is designed).

This is the subcircuit being called by spectre:

simulator lang=spice
.subckt mymosfet drain gate source
M1 drain gate source source DMOS w=1u l=1u
.model DMOS NMOS( KP= 1400.5  VTO=4  THETA=0  VMAX=1.5e5  ETA=0.005  LEVEL=3)
.end

I also tried to convert my model to spectre netlist with spp commad and I get same results.

Does anyone have an idea what to tweak to get the correct device characteristic in spectre?



Thanks!

  • Without knowing what you're expecting it to look like, it's hard to be sure. Maybe adding +spice on the command line for spectre might help - this adds some additional SPICE compatibility. That said, I'm not sure LTSPICE is definitely "correct" either.

    Spectre does have PSPICE model support nowadays - and can read a PSPICE model using pspice_include. Maybe that would help too?

    Regards,

    Andrew.

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