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Diffstat (limited to 'Windows/spice/examples/measure/mos-meas-dc-control.sp')
-rw-r--r-- | Windows/spice/examples/measure/mos-meas-dc-control.sp | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/Windows/spice/examples/measure/mos-meas-dc-control.sp b/Windows/spice/examples/measure/mos-meas-dc-control.sp new file mode 100644 index 00000000..9869cf60 --- /dev/null +++ b/Windows/spice/examples/measure/mos-meas-dc-control.sp @@ -0,0 +1,49 @@ +***** Single NMOS Transistor .measure (Id-Vd) *** +* Altering device witdth leads to select new model due to binning limits. +* New model has artificially thick gate oxide (changed from default 3n to 4n) +* to demonstrate the effect. +m1 d g s b nch L=0.6u W=9.99u ; W is slightly below binning limit + +vgs g 0 3.5 +vds d 0 3.5 +vs s 0 dc 0 +vb b 0 dc 0 + +* model binning +* uses default parameters, except toxe +.model nch.1 nmos ( version=4.4 level=54 lmin=0.1u lmax=20u wmin=0.1u wmax=10u toxe=3n ) +.model nch.2 nmos ( version=4.4 level=54 lmin=0.1u lmax=20u wmin=10u wmax=100u toxe=4n) + +.control +dc vds 0 3.5 0.05 vgs 3.5 0.5 -0.5 +meas dc is_at FIND i(vs) AT=1 +meas dc is_max max i(vs) +meas dc vds_at2 when i(vs)=10m +* starting with branches in descending order of vgs +* trig ist the first branch which crosses 5mA +* Targ is the first branch crossing 10mA +meas dc vd_diff1 trig i(vs) val=0.005 rise=1 targ i(vs) val=0.01 rise=1 +* trig ist the first branch which crosses 5mA +* Targ is the second branch crossing 10mA +meas dc vd_diff2 trig i(vs) val=0.005 rise=2 targ i(vs) val=0.01 rise=2 +alter @m1[w]=10.01u ; W is slightly above binning limit +dc vds 0 3.5 0.05 vgs 3.5 0.5 -0.5 +meas dc is_at FIND i(vs) AT=1 +meas dc is_max max i(vs) +meas dc vds_at2 when i(vs)=10m +meas dc vd_diff1 trig i(vs) val=0.005 rise=1 targ i(vs) val=0.01 rise=1 +* there is only one branch crossing 10mA, so this second meas fails with targ out of interval +echo +echo The next one will fail (no two branches crossing 10 mA): +meas dc vd_diff2 trig i(vs) val=0.005 rise=2 targ i(vs) val=0.01 rise=2 +*rusage all +plot dc1.i(vs) i(vs) +.endc + + +.end + + + + + |