[SI-LIST] Re: Hspice Limitations

Hi,

I feel that it should be tool specific bug, because the schmit trigger
should give output when it is set to trigger after the range.

Also check for frequency of the swing or oscillation because the simulation
tool or the component modelled may not respond to high frequency swing.

hariharan

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Parthasarathy Sampath
Sent: Thursday, December 19, 2002 12:52 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Hspice Limitations



Hello All,
  I have a question regarding Hspice capability.
  I am right now working on oscillator with Invertor
as its feedback to produce oscillations. The o/p of
oscillator is fed to a trigger ciruit to produce
pulse.
  For closed loop simulation without the schmitt
circuitry, the o/p of oscillator o/p moves almost
rail-rail. If i include schmitt trigger, the o/p swing
of oscillator reduces.
 Moreover there is no o/p from schmitt ckty even
though the schmitt trigger is set to trip within that
range.
 My colleagues say it might be due to limitations of
Hspice tools.
 Please comment on this problem.

Thanks in advance.
Partha!


PS:

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