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what's "gmin" means in spectre

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spring1860

spring1860

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Hi
can some take a short explain about symbols such as 'gmin, iabs , vabs ' in spectre ？

thank u very much .
 

try to refer to "designer's guide to spectre"
 

spring1860 said:
Hi
can some take a short explain about symbols such as 'gmin, iabs , vabs ' in spectre ？

thank u very much .
Click to expand...
gmin: Spectre adds a conductance value "gmin" between non-linear devices
iabs: maximum acceptable error in absolute current
vabs: maximum acceptable error in absolute voltage
 

Hi can anyone tell how to remove the gmin problem from cadence? actually in log it is displaying that Gmin=1 pS is large enough to noticeably affect the dc solution.
 

amitdahiya_04 said:
Hi can anyone tell how to remove the gmin problem from cadence? actually in log it is displaying that Gmin=1 pS is large enough to noticeably affect the dc solution.
Click to expand...

1/1pS = 1TΩ ; I think you can forget about this warning.
But you can still try and set Gmin to 1e-15 = 1fS .
 

gmin is not a problem, it is trying to be a solution.

The more likely problem is unrealism in models. What FET has
a real leakage under 1pA/V? Right.

If your circuit is sensitive to the gmin mesh's effects, you
are either attempting something really spectacular (and
likely unrealizable) or you will be surprised later when you
get the real device and the real transistors leak like real
transistors do.
 

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