HSPICE Questions, Using E and F element

[MammPp]

Dear all,

I tried to convert the macro model from NG-SPICE to HSPICE, however I stuck in some problems.

Subcircuit from NG-SPICE

.SUBCKT Mem 1 2 6
Eres 1 9 poly(2) (8,0) (11,0) 0 0 0 0 1
Vsense 9 4 DC 0V
Fcopy 0 8 Vsense 1
Rstep 8 0 1k
Rser 2 4 10
Fmem 6 0 poly(2) Vsense Ecopy -0.5e-10 0 1e-10 0 -1 0 0 0 1
Cmem 6 0 90nF
Rsp 6 0 1000Meg
Ecopy 7 0 0 6 1
Rc 7 0 1
Ecpy2 10 0 6 0 1
Vref ref 0 DC 1V
R1 10 11 100k
Ssat1 11 0 0 11 SWX
Ssat2 11 ref 11 ref SWX

.model SWX SW(Ron=0.001, Roff=1000Meg, Vt=0.00001V, Vh=0.00001V)
.ends Mem


From the above model, I changed to HSPICE as the following

.SUBCKT Mem 1 2 6

Eres 1 9 poly(2) (8,0) (11,0) 0 0 0 0 1
Vsense 9 4 DC 0V
Fcopy 0 8 Vsense 1
Rstep 8 0 1k
Rser 2 4 10
Ecopy 7 0 0 6 1

Cmem 6 0 90nF
Rsp 6 0 1000Meg

Rc 7 0 1
Ecpy2 10 0 6 0 1
Vref ref 0 DC 1V
R1 10 11 100k

Gswitch1 11 0 VCR PWL(1) 0 11 0V,1000Meg 0.00001V,0.001
Gswitch2 11 ref VCR PWL(1) 11 ref 0V,1000Meg 0.00001V,0.001

Fmem 6 0 poly(2) Vsense Ecopy -0.5e-10 0 1e-10 0 -1 0 0 0 1

.ends Mem

From above HSPICE code, there is an error as the following

fmem 6 0 poly(2) vsense ecopy -0.5e-10 0 1e-10 0 -1 0 0 0 1
**error** (d:\neu course\phd\hspice\memristor\memristor 3 adampj.sp:27) voltage source not found on above line
**error** (d:\neu course\phd\hspice\memristor\memristor 3 adampj.sp:27) difficulty in reading input

In my view, the problem is from Ecopy. Since I think, Ecopy can't use as the current source in the F-Element.

Anyone has some ideas to fix this problem ?

Thank you,
PJ

P.S. I'm also not sure that the switch from NG-SPICE code the I changed to HSPICE is correct. If it's possible, anyone could check that line for me also.[/b]

 

[keith1200rs]

What problems did you get with the original subcircuit? I don't use Hspice but my simulator is generally compatible with Hspice and runs ok with the original subcircuit but with quite a few errors with your modified one.

Keith.

 

[prcken]

it seems that E element can not be embedded in F element.
anyway, what's your defining equation?
I(Fmen)=??

 

[MammPp]

The original subcircuit is good however it's fit with the NG-SPICE not HSPICE.

Since my circuit simulator is HSPICE, I tried to convert from the original subcircuit to HSPICE. As shown above, E-Element is not compatible with F-Element so I tried to find the solution of this problem.

prcken: the definition of I(Fmem) is

-0.5e-10 +I(Ecopy)e-10 - I(Vsense)*I(Ecopy) + I(Vsense)*I(Ecopy)^2

 

[prcken]

i see, your defining equation is correct.
i think the problem lies in Ecopy is another controlled source. you can do a simple test, change Ecopy to a independent source and run simulation to see whether there is a error.

btw, what's the defining equation of Ecopy?
Ecopy is -V(6)? while the voltage at node6 is unknown, you want to sovle the current at the exact node 6, maybe there is a convergence problem？

 

[MammPp]

The reason that I think the problem is from Ecopy is, when I used Vtest instead of Ecopy, the error is not occured.

For the definition of Ecopy, to tell the truth, I don't know. (just want to convert the code in NG-SPICE to HSPICE).

However, I tried to changed the Fmem to

Fmem 6 0 poly(2) Vsense 0 6 -0.5e-10 0 1e-10 0 -1 0 0 0 1

(Changed Ecopy to 0 6)
The same error is still occured.

 

[prcken]

Fmem 6 0 poly(2) Vsense 0 6 -0.5e-10 0 1e-10 0 -1 0 0 0 1

you can not do that
you can not change the name of voltage source through which the controlling
current flows into two nodes.

Eres 1 9 poly(2) (8,0) (11,0) 0 0 0 0 1

if this works
maybe you can try this ?
Fmem 6 0 poly(2) Vsense (0 6) -0.5e-10 0 1e-10 0 -1 0 0 0 1

 

[MammPp]

Fmem 6 0 poly(2) Vsense (0 6) -0.5e-10 0 1e-10 0 -1 0 0 0 1

This one is not work. T_T

 

[prcken]

Fmem 6 0 poly(2) Vsense (0 6) -0.5e-10 0 1e-10 0 -1 0 0 0 1

This one is not work. T_T

sorry to hear that
i have no idea now

 

[keith1200rs]

I have not made any suggestions as I don't use Hspice or NG-Spice and I thought you were managing to solve the problem.

At the risk of making a daft suggestion, could you not just put a voltage source with zero voltage in series with Ecopy, then use that in your Fmem statement?

Keith.

 

[MammPp]

keith1200rs:
I don't understand about your suggestion. Is it possible that you could give me some clue ?

Anyone know this answer, please let me know

 

[keith1200rs]

Assuming the earlier statement is correct "... E element can not be embedded in F element" then you need to add another device to get round the problem. If you add a voltage source with zero voltage in series with the E source (Ecopy) then it will have no effect on the E source but will not give you a device other than an E source to sense the current for the F element - the zero voltage source.

Keith.

 

[MammPp]

Keith,

Thank you so much, it's worked.

Pilin

 

[abcpowerjuan]

I'm just entering the world of circuit simulation in the theory memristor has two terminals and three write code, someone can explain ...

 

[ahmad1954]

3rd terminal can used to set the initial value. this node should be floating.