[SI-LIST] Re: HSPICE error

Nancy,

From node 2 onward, you have two capacitors c1 and c2 in series. Spice
does not know the voltage on node 3 since there can be any charge at
that location, and the initial conditions are undefined.

From your circuit, it looks like you want to see those two capacitors in
series without outside interference. For that, you can let Hspice know
that node 3 starts with 0 volts. If that is what you want to accomplish,
add a large resistor to node 3:
Rlarge 3 0 1e8

That should take care of your problem.

Mike

-----------------------------------------------------------------
Michael Khusid
Ansoft Corporation
HF/SI Application Engineer
 
25 Burlington Mall Road, 6th floor
Burlington, MA 01803-4100
 
Tel 781-229-8900 Ext. 34
Fax 781-229-8624
--------------------- http://www.ansoft.com ---------------------
 

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Nancy Wei
Sent: Thursday, July 25, 2002 1:04 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] HSPICE error



SI-list,

I am using Star-HSPICE to simulate a very simple circuit, but I got an
error 
message "no dc path to ground from node    0:3 ". Can HPICE simulate
this 
kind of circuit? How can I fix the error? Thanks.

-----------------circuit script ------------------
.option post = 2
.ac lin 100 1e6hz 5ghz
vs 1 0 ac 1
rs 2 1 50
c1 3 2 1e-12
c2 3 0 2e-12
.print ac vm(3)
.end
---------------------------------------------------
**error**:  no dc path to ground from node    0:3

Nancy


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