[SI-LIST] Re: Need help with hspice error
- From: Kim Helliwell <kimgh@xxxxxxxxx>
- To: mohammad.ali@xxxxxxxxxxx
- Date: Wed, 14 Aug 2002 09:47:36 -0700
SPICE cannot analyze a circuit that has inductors or
voltage sources in parallel, any combination that
involves a loop of only inductors or voltage sources.
Putting a resistor from the offending node to ground
doesn't break the loop, which is why you didn't fix
the problem by doing that. You have to break the
loop by inserting a resistor in the loop itself. Presumably
you would find it preferable to use a small resistor in
this case.
However, even better would be to analyze whether the
loop is actually necessary and, if not, remove one of the
offending sources.
Unfortunately, these loops can be subtle and difficult to
find if you are using numerous subcircuits containing
sources and connected together. You have to analyze
such situations carefully.
Kim
On Wednesday, August 14, 2002, at 09:30 AM, Mohammad Ali wrote:
>
> Hello,
>
> I am running one spice simulation using Avanti HSPICE tool. The
> circuit topology is a differential net consisting of a driver,
> interconnect, and a receiver. I am applying a PRBS data pattern
> (in PWL format) at the input and running the simulation at
> 2.5Gb/s. During the simulation, I receive the following error
>
> **error**: inductor/voltage source loop found containing 12:vprbsp
>
> where vprbsp is the node where the psbs pulse is applied. I tried
> to add a very high impedance resirtor (10+9 ohms) at this node, but
> did not get any help.
>
> Could anybody explain me where error is coming from and what is the
> approach to resolve this error? Thanks.
>
> -Mohammad Ali
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Kim Helliwell
Apple Computer
kimgh@xxxxxxxxx
408 974 9936
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