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setting variable for stationary vs time-dependent study in same project
Posted 5 avr. 2016, 17:28 UTC−4 Parameters, Variables, & Functions, Studies & Solvers Version 5.2 2 Replies
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I have a component definition for an electrostatic potential constraint:
Vgate = 100 * (1 - exp(-t/3e-9))
This ramps up the gate bias to 100 volts with a time constant of 3 nsec.
However, I'd also like to do a stationary study in addition to the time-dependent study. When I run the stationary study I get:
"Undefined variable: t"
Ideally I'd like to be able to do two studies: one time-dependent, another stationary with the time also ramped as a parameter. Alternately I could explicitly ramp Vgate in the stationary study with the exponential time dependence applied to the time-dependent study.
As it stands I need to redefine the boundary condition depending on which study I am using.
Any help to this seemingly super-basic question?
thanks,
Dan
Vgate = 100 * (1 - exp(-t/3e-9))
This ramps up the gate bias to 100 volts with a time constant of 3 nsec.
However, I'd also like to do a stationary study in addition to the time-dependent study. When I run the stationary study I get:
"Undefined variable: t"
Ideally I'd like to be able to do two studies: one time-dependent, another stationary with the time also ramped as a parameter. Alternately I could explicitly ramp Vgate in the stationary study with the exponential time dependence applied to the time-dependent study.
As it stands I need to redefine the boundary condition depending on which study I am using.
Any help to this seemingly super-basic question?
thanks,
Dan
2 Replies Last Post 5 avr. 2016, 18:42 UTC−4
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Posted:
9 years ago
Daniel,
just define a parameter t in the parameter table and assign a value that is suitable for the stationary step. t will be overwritten by the time dependent study solver.
Cheers
Edgar
--
Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
just define a parameter t in the parameter table and assign a value that is suitable for the stationary step. t will be overwritten by the time dependent study solver.
Cheers
Edgar
--
Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
Please login with a confirmed email address before reporting spam
Posted:
9 years ago
Thanks!
Key is it's a parameter and not a variable. I'd tried the latter.
Dan
Key is it's a parameter and not a variable. I'd tried the latter.
Dan