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Hello,
Can anyone give me a hint how I determine the capacitance of an input
pin of a standard cell (extracted netlist) with spectreS?
Thanks in advance for any help.
Thomas
You mean I have to do it by hand??? Or is there a function in spectreSwatch the net-list and add all capacitances connected to that node.
Thomas Popp wrote
Can anyone give me a hint how I determine the capacitance of an input
pin of a standard cell (extracted netlist) with spectreS?
S. Badel wrote:
watch the net-list and add all capacitances connected to that node.
You mean I have to do it by hand??? Or is there a function in spectreS
(OCEAN) which does the trick automatically? I've heard that a typical
SPICE simulator is able to calculate the capacitance of every node of a
given netlist. So I strongly presume this is also possible with
spectreS...
-Thomas
Thomas Popp wrote
Can anyone give me a hint how I determine the capacitance of an input
pin of a standard cell (extracted netlist) with spectreS?
MarcHello,
Can anyone give me a hint how I determine the capacitance of an input
pin of a standard cell (extracted netlist) with spectreS?
Thanks in advance for any help.
Thomas
Regards,
Thanks a lot, that worked!don't know any special function. However, if you want to compute
the parasitic capacitance at the input of a cell, you can do the following.
open layout & schematic views
run extraction on layout, then LVS
LVS must be successful
then, on LVS window select "parasitic probe", push "whole net" and select a
net in
the schematic. This will add up all parasistics and display the result.
However, it non-parasitic capacitors won't be taken into account.
The simples way is to run the simulation driving the input from aCan anyone give me a hint how I determine the capacitance of an input
pin of a standard cell (extracted netlist) with spectreS?
Thanks for your help Marc!Thomas,
I think you are looking for the "captab" function of spectre. Here is an
example how to include it in a netlist for a DC run (it is not in the
gui yet, so you might load it over an include file ):
dcOp dc write="spectre.dc" maxiters=150 maxsteps=10000 annotate=status \
infoname=capinfo2
capinfo2 info what=captab where=file file="capnodesdc"
dcOpInfo info what=oppoint where=rawfile
Thanks for your help Marc!
Actually I'm running the simulation of my standard cells with OCEAN
using the simulator spectreS.
Until now I don't mess around with the simulation netlists. I get them
by creating a simulation schematic for a cell and starting the "Analog
Environment". Then I create a raw and a final netlist of the whole
simulation circuit (using the extracted netlist of the simulated
standard cell). These netlists are then used by a OCEAN skript to
perform the simulation.
My question is: Is it possible to use OCEAN to tell the simulator
__spectreS__ to compute the capacitance of an input pin of the simulated
standard cell?
-Thomas