How to get gm, gm*ro.etc when I am sweeping the Vov

[hjzs18]

how to get gm id ro

Hi, there.
I am a newbie in this area, and just trying to master how to design CMOS analog. I want to sweep Vov, and want to get how gm/Id , gm/Cgs and gm*ro changes with it. ( where gm is the transconductance , Id is the quiescent current flowing through the MOS transistor......) I am using Cadence and Spectre, how to set those DC values as variables versus the Vov(overdrive voltage) which i sweep.


Thx alot

 

[holddreams]

i want gm ro id

I think you can use the caculator to get what you want.

 

[hjzs18]

I think you can use the caculator to get what you want.

Thx Holddreams:
I want to see the curve gm/Id versus Vov, how can i set up the simulation to do this??

 

[holddreams]

*The following is the nmos.sp files simulated by Hspice.
*Size nmos device by plotting Id versus V*=2*Id/gm
mn dn dn 0 0 n33 w=10u l=1u m=1
vdn dn 0 dc 1v
.dc vdn 10mv 3.3v 10mv

*Note that vs is v*..
.probe vs=par(`2*i(mn)/gmo(mn)`)
.probe Id=par(`i(mn)`)

.option post probe list node dccap brief ingold=2 measdgt=6 numdgt=8
.lib
`./ms018_v1p6.lib` TT
.op
.temp 25
.end


*The following is the pmos.sp files simulated by Hspice.
*Size pmos device by plotting Id versus V*=2*Id/gm
mn dn dn 0 0 p33 w=10u l=1u m=1
vdn 0 dn dc 1v
.dc vdn 10mv 3.3v 10mv

*Note that vs is v*..
.probe vs=par(`-2*i(mn)/gmo(mn)`)
.probe Id=par(`-i(mn)`)
.option post probe list node dccap brief ingold=2 measdgt=6 numdgt=8
.lib
`./ms018_v1p6.lib` TT
.op
.temp 25
.end