high switching speed problem ...

[shams mr]

hi all

i want to design a mosfet for digital applications ...

one of the characteristic of my design is well behavior at high switching speeds

because in digital application we have large signals i can't use small signal models to
analysis cut off frequency and band width of my design ...

so i don't know how to solve this problem

can any one help me in this relation ?

good luck

 

[erikl]

For this we use transient analysis. If you have an appropriate mosfet model, transient simulation can handle large signal behaviour and will show you propagation delay and slew rates, resp. rise- and fall times.

 

[shams mr]

hi erikl

thank for your reply ....

i know about transient analysis and i have done handy calculations transient analysis . could you tell me which software can give large signal behaviors ?

and does it give frequency response ?

thank you in advance

good luck

 

[erikl]

could you tell me which software can give large signal behaviors ?

Any SPICE-based software (Spice, SpiceS, Hspice, LTspice, Eldo ...) or SPECTRE can do it, if the transistor model supports it (model level-dependent).

and does it give frequency response ?

Sure, that's its purpose - among other analyses!

 

[shams mr]

hi erikl !

thank you for your quick reply ...

i'm good at spice ( orcad => capture ) but i haven't experienced such case ...

could you tell me which part of this software do large signal analysis ?

thank you very much

good luck !

 

[erikl]

could you tell me which part of this software do large signal analysis ?

Pls. read again my answer from Tue, 11 May 2010 9:55 above!