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how to measure the current in subckt

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santoshchiniwar

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hi,
how can I measure the current and plot the graph for subckt in hspice code.. i want to measure the drain current of multigate FET
 

.PRINT TRAN I(hier1.hier2.hier3.FET_name)
.PLOT TRAN I3(hier1.hier2.hier3.FET_name)

hier1 (2,3) are the hierarchy names. I=I1 and I3 are the S and D currents, according to the node order of the FET.

Not sure if this works, but should be close to what will work. My hspice experience is long ago, sorry!
 

hi,
Could you please give me an example for measuring the current between the nodes in subckt ...
 

for measuring current from ports of subckt, please use

.subckt temp a b
m1 a b 0 0 nch l=1u w=1u
.ends

x1 in out temp

.print isub(x1.a) $ print in lis file
.probe isub(x1.a) $ plot is tro file
 
hi,
Actually mentioned above method didn't worked :(

code is as follows
** subckt for NMOS **

.subckt DGNMOS NVd NVgf NVgb NVs
X.......X.....
.
.
.
.
mn1 NVd NVgf1 NVs 0 nmos w=60e-9 l='len'
mn2 NVd NVgb1 NVs 0 nmos w=60e-9 l='len'

En1 NVgf NVgf1 VOL= xxx
En1 NVgb NVgb1 VOL=xxx
ends

xnmos 2 1 gnd gnd DGNMOS
vds 2 gnd dc 1
vgs 1 gnd dc 0.6
vbs gnd gnd dc 0
.dc vds 0 1 0.01
.op
.plot dc
.print isub(x1.NVd) $ print 2 lis file

.alter gatesource voltage vgs=0.625
vgs 1 gnd dc 0.625
.alter gatesource voltage vgs=0.650
vgs 1 gnd dc 0.650

.end

i wanted to take current reading from xnmos (as we do for NMOS mosfet .plot dc i(mn) ) to make IV characteristic of this transistor

and my hspice is Hspui for windows c-2009-03
 

please see below example, simulate in hspice and it will generate a .sw0 file .you can read that file in waveform viewer.
this example gives u direct VI characterstics of subckt(MOS). you need not use .alter as hspice allows two voltage sweeps ( see .dc statement below).

in ur example u have used .print isub(x1.nvd) it should be isub(xnmos.nvd) :)

EXAMPLE:


*** TITLE

.subckt nmos_ank d1 g1 s1 b1
m1 d1 g1 s1 b1 nch l=1u w=1u
.ends

xmos d g s b nmos_ank

vd d 0 0
vg g 0 1
vs s 0 0
vb b 0 0

.opt post probe
.model nch nmos

.dc vd 0 3 0.01 vg 0 3 0.1

.probe isub(xmos.d1)

.end
 

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