NMOS model works PMOS doesn't!!

R

Robin

Guest
Hello,

Has anyone gotten the TSMC 0.18 Spectre model files to work on Spectre
5.0? I managed to simulate all NMOS's, including the 3.3V I/O devices,
but when I try to simulate PMOS's, spectre complains:

Warning from spectre at dc = 0 V during DC analysis 'dc'.
M1: The bulk-source junction current exceeds 'imax'

The circuit only has one transistor and I am just running the Id/Vds
characterization curves. It is not a problem with my circuit because
it works when I simulate with SpectreS.

The complementary circuit for NMOS works perfectly fine with the
model.

Any comment appreciated,

Is it a bug?

Thanks in advance,

Robin Tsang

Student from UT Austin
 
Check how you biased the bulk connection of your
PMOS. it has to be connected to vdd!, not gnd!

this is not related to the models, at first sight
at least.

stéphane


Robin wrote:
Hello,

Has anyone gotten the TSMC 0.18 Spectre model files to work on Spectre
5.0? I managed to simulate all NMOS's, including the 3.3V I/O devices,
but when I try to simulate PMOS's, spectre complains:

Warning from spectre at dc = 0 V during DC analysis 'dc'.
M1: The bulk-source junction current exceeds 'imax'

The circuit only has one transistor and I am just running the Id/Vds
characterization curves. It is not a problem with my circuit because
it works when I simulate with SpectreS.

The complementary circuit for NMOS works perfectly fine with the
model.

Any comment appreciated,

Is it a bug?

Thanks in advance,

Robin Tsang

Student from UT Austin
Click to expand...
 
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