On May 19, 2006, at 12:55 PM, al davis wrote:
On Friday 19 May 2006 13:21, Wolfgang Buesser wrote:
Hi everybody,
probaly this is a stupid question, but I am having
difficulties generating a hierachical spice netlist: I have
tried to follow the instructions in the manual and ended up
with the following netlist:
*******************************
* Begin .SUBCKT model *
* spice-sdb ver 12.27.2005 *
*******************************
.SUBCKT Amp
*============== Begin SPICE netlist of main design
============ MX1/M1 X1/N1 NN X1/GND X1/GND NMOS l=1.2 w=2.2
V1 NIN 0 VIN
X1/C1 NOUT X1/N1 Ccomp
This is incorrect.
Spice (and all Spice format simulators) uses the first letter to
determine the type. Since the first letter is "X" that makes
it a subcircuit call. A capacitor must start with C.
The problem is that gnetlist was apparently not originally designed
for SPICE. The hierarchical names it generates are *backwards*: they
start from the top level and work down, but SPICE needs the name to
start with the character for the component, not its enclosing circuit.
Again, the solution is to compose separate flat subcircuits, and let
SPICE put them together hierarchically. And that's just what
following the instructions in Stuart's excellent tutorial will have
you doing.
John Doty Noqsi Aerospace, Ltd.
[EMAIL PROTECTED]
