hspice wrong calculations?

Jan 15, 2006 3 Replies

.IC is just a first guess, the simulator calculates the proper value from there.

...Jim Thompson

-- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | |

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hello



I came across one problem during .OP simulation. I am simulating an opamp.



The thing is: i polarize PMOS gate by 0.8V . Source voltage is 1.2274 so Vgs=-0.4724 but in the output file Vgs is calculated as Vgs=-0.4273



What does this different come from?



regards



Luke


Naw, the OP can't add and subtract. Or maybe can't type. or very generously does not understand that typical reltol is 0.001 and the result IS within limits.

JosephKK

Is there a typo in the original post?

-0.4724 - -0.4273 --------- -0.0451

-- Mike --

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