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offset simulation with Hspice for a simple comparator

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canarybird33

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Hello all
After many hours searching and reading the tutorials for offset calculation, I don't know what should I do.
here is my codes. please help me to complete it.I don't understand how to write codes for DCMATCH or monte carlo simulation and how to extract the information.

.options post
.op
.param Lmin='0.18u'
vdd vdd gnd dc=0.6
vn 1 gnd dc=0.3
vp 2 gnd dc=0.3
.options NUMDGT=10 MEASDGT=10

vpulse 4 gnd pulse(0 0.6 0 1ps 1ps 20ns 40ns )
.tran .05n 400n
.DC vn 0.3 0.5 0.001 vp 0.3 0.460 0.05
.print dc v(1,2) v(7,8)
.DC vp 0.3 0.5 0.01 SWEEP MONTE=30

M0 5 1 3 gnd nch L='1.111111111*Lmin' W='22.222222222*Lmin'
M1 6 2 3 gnd nch L='2.777777777*Lmin' W='88.888888888*Lmin'
M2 3 4 gnd gnd nch L='2.777777777*Lmin' W='88.888888888*Lmin'
M3 8 7 5 gnd nch L='11.11111111*Lmin' W='88.888888888*Lmin'
M4 7 8 6 gnd nch L='11.11111111*Lmin' W='88.888888888*Lmin'
M5 8 7 vdd vdd pch L='11.11111111*Lmin' W='133.33333333*Lmin'
M6 7 8 vdd vdd pch L='11.11111111*Lmin' W='133.33333333*Lmin'

.end
Click to expand...
what do these codes do?
  • .meas tran offsett trig v(1,2) VAL=0 cross=1 targ v(7,8) VAL=1.8 cross=1
  • .meas offset PARAM='-offsett*slope'

 
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let's make it easier
I have a comparator , but it doesn't compare. I mean by changing input (vn>vp to vn<vp), output should change, but it doesn't.
what's the problem? :bang:
I tested it with Proteus. it was okay, but in Hspice it doesn't work.

Please Help me :sad:
 
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