[SI-LIST] Re: Hspice Limitations



So far I have seen two types of schmitt trigger circuits in CMOS,
one having input fully resistantly isolated from its output, while the
other one would have a transient connection during switching.  I
suspect the slow down effect might be on the second type only,
in view of Parthasarathy's saying that it does not work in lower
frequency.

Rgds,
Raymond




"Ingraham, Andrew" <Andrew.Ingraham@xxxxxx> on 20/12/2002 09:31:30

Please respond to Andrew.Ingraham@xxxxxx

To:   si-list@xxxxxxxxxxxxx
cc:    (bcc: Raymond Leung/sdc)

Subject:  [SI-LIST] Re: Hspice Limitations



> 2. The load capacitor on the oscillator is 15pf which
> is huge compared to the capacitor load effect the
> schmitt trigger can ever think of producing.

By "loading down" the oscillator, it could be capacitance (such as a
typo in the model that causes it to have huge capacitance) ... but it
also could be something other than capacitance.  For example, if a power
source doesn't get to the Schmitt circuit, that would make it have no
output, and might cause it to nonlinearly load down the oscillator
circuit.

Andy



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