CDF parameter display problem

Hi

I read the manual about passing parameters.
So, I used 6 parameters to "inverter".

width_pmos
width_nmos
length_pmos
length_nmos
number of fingers (pmos)
number of fingers (nmos)

But I can't display all of them.
If I display over 4 parameters, they are overlapped. ¤Ð.¤Ð

I think this is very simple, and everyone uses inverter like this.

Please, show me the way.

 

I found another method for displaying parameters.

In the symbol view,

"ilInst~>wp"

this is good for displaying.

==================================================

But, I have another question.

I extract netlist from this circuit,

 

This would normally be done by having cdsParam labels on the symbol. These
would be "ILLabel" type labels, with values such as:

cdsParam(1)
cdsParam(2)

etc. See the analogLib components as examples.

What is displayed in those slots is controlled by the CDF label display
section, and can be overridden by the ADE annotation menus, or the
Edit->Component Display menu in the schematic tool.

Regards,

Andrew.

 

What simulator are you using? The language doesn't give it away too much,
although I suspect it might be spectre? If so, the syntax would be:

subckt inv a z
parameters pw=10u nw=10u // default values
M1 (z a vdd! vdd!) pch w=pw l=0.25u
M2 (z a vss! vss!) nch w=nw l=0.25u
ends inv

xi0 net0 net1 inv pw=20u nw=20u

or something like that...

Regards,

Andrew.

 

Thanks for your reply.

I use hspice.

The netlist that I extract is like this
_________________________________
..subckt inv a z
M1 (z a vdd! vdd!) pch w=10u l=0.25u
M2 (z a vss! vss!) nch w=4u l=0.25u
..ends inv

xi0 net0 net1 inv
-----------------------------------------------------------

How can I make this?

..subckt inv a z pw=10u nw=10u
M1 (z a vdd! vdd!) pch w=pw l=0.25u
M2 (z a vss! vss!) nch w=nw l=0.25u
..ends inv

xi0 net0 net1 inv pw=10u nw=4u

 

Thanks a lot,
Andrew.

I have another question here.

Can I make a netlist including variables for an hspice simulator?
____________________________________
..subckt inv A Z pw=10u nw=10u
M0 Z A VSS VSS NCH W=nw ...
M1 Z A VDD VDD PCH w=pw ...
..ends

xi0 net0 net1 inv pw=a nw=b <---- This is what I want
to generate.
____________________________________

Regards,

Ajin.

 

Are you using the analog environment? If so, you can set the width of
the pch device to "pw" (just a string). Then, do a "copy variables from
cell view" in AE. You can then fill in the variable table in AE and
netlist.

 

Thanks, Poojan.

You're right, I'm using 'analog environment'.
I can set paramters in AE window, Design Variables.

After setting the value of variables, I can generate the netlist.
But, I can't remain the value as variable(string), "pw".
I would like to generate netlist like this.

After generating, I can use the syntax with an hspice input file.

'.param pw=10u'

Thanks again for your reply. But still I have a headache.

 

I think this is answered by my response to your later post about hspiceD versus
hspiceS.

Regards,

Andrew.

 

Thanks a lot!

Using an hspiceD view, I could generate a new netlist.

Thank you again, Andrew.

 

Hi Andrew,

Where are the cds parameters that are displayed by default stored?
I wish to change the paramters that are displayed for some mosfets in
the device lib
but can't find where they are initialised [i.e. gm, vgs, etc]
Is this done by cadence? Or the foundry supplying the device lib?

Kevin

 

Sorry about the slow response on this - I've been rather busy, and so haven't
been able to respond in this forum (with Christmas holidays as well...)

Anyway, this information is stored in the Cell CDF (Tools->CDF->Edit
in the CIW) for the component in question. It lists the parameters and
operating point parameters (etc) for each device that will be displayed
by default. You can also use the Edit->Component Display in the schematic
window to change on the fly what is displayed (this alters the effective CDF).

Regards,

Andrew.

 

worked this out in the meantime!
thanks anyway!