Re: Wanted: LM-709 (Spice model) National Op-Amp

On Sun, 18 Sep 2005 21:02:25 GMT, "Robert" <Robert@xxxxxxxxx> wrote:

[snip]
>
>Two passive components, a resistor and a cap, left in a netlist connected
>to ground WITH the other end disconnected causes a circuit to converge when
>without them it does not. Bob went on to say (tongue in cheek?) that perhaps
>non-functioning components strewn randomly through a design could be an add
>on Spice convergence feature.

Though Bob Pease is a fellow classmate of mine at MIT, he is very
often quite full of it... a good portion of what he propounds is just
plain urban legend BS.

The way he typically spouts I often wonder if he's ever used Spice at
all.

>
>That does not have anything to do with the type of errors you mentioned. And
>the existence of such a problem points to deeper problems with Spice than
>you mention.

A good simulator will report floating nodes.

>
>It is quite possible it was a problem with an early Spice Algorithm in how
>the numbers were crunched (ill conditioned Matrix were favorite weasel words
>at one time).
>
>Wouldn't know. Would know that the problem (if it is as I remembered) has
>nothing to do with the problems you mention.
>
>Robert
>
>
>
>


...Jim Thompson
--
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