MOS operating point information

[kavitha_rapolu]

What is important information in MOS operating point below?

What does betaeff stand for? How to use it?
How to get delta ie vdsat?
What capacitances are important?

I know about id, gm, gds, region , vgs , vds, vth etc.,


signal OP("/M0" "??")

betaeff 1.847746m
cbb 4.531032f
cbd -2.064433f
cbdbi 153.4456a
cbg -1.106082f
cbs -1.360517f
cbsbi -853.2713a
cdb -2.665263f
cdd 2.959712f
cddbi -14.62545a
cdg -2.690805f
cds 2.396356f
cgb -979.8081a
cgbovl 30.86827a
cgd -873.2007a
cgdbi 26.56085a
cgdovl 899.7615a
cgg 7.746893f
cggbi 5.552559f
cgs -5.893884f
cgsbi -4.63018f
cgsovl 1.263705f
cjd 2.074576f
cjs 0
csb -885.961a
csd -22.07824a
csg -3.950006f
css 4.858046f
cssbi 3.594341f
gbd 433.783n
gbs 0
gds 7.987988u
gm 642.5199u
gmbs 166.7346u
gmoverid 1.254258
i1 512.3598u
i3 -512.2709u
i4 -88.85975n
ibd -88.85975n
ibs 0
ibulk -88.85975n
id 512.3598u
ids 512.2709u
igb 0
igcd 0
igcs 0
igd 0
igidl 0
igisl 0
igs 0
is -512.2709u
isub 88.85975n
pwr 1.844495m
qb -6.738266f
qbd -9.061329f
qbi -6.682703f
qbs 0
qd -275.2955a
qdi -1.636921f
qg 12.3434f
qgi 12.28784f
qinv 3.047502m
qsi -3.968214f
qsrco -5.32984f
region 2
reversed 0
ron 7.027531K
type 0
vbs 0
vdb 3.6
vds 3.6
vdsat 577.0589m
vfbeff NaN
vgb 1.8
vgd -1.8
vgs 1.8
vgsteff 1.106862
vth 693.1301m

 

[leo_o2]

When you consider noise coupling and transient speed, you need to check the capacitors.

 

[tlihu]

Check if vds >= vdsat for operating in saturation.

 

[rider of rohan]

betaeff basically describes the product of mobility, Cox and aspect ratio of the mos device. so you'll see that betaeff of an nmos is 2-3 times larger than an identically sized pmos.