Re: gEDA-user: Question regarding 1st LTSpice simulation

[Andy Peters <devel@xxxxxxxxx>]

On Sep 18, 2007, at 12:07 PM, al davis wrote:

> So, for LT-spice ....
>
> What is the "organic matter" being added to the soil?
> What are the "beneficial insects?"
>
> And finally:
> What are the "weeds" they want to choke out?

These are interesting questions.

The answer is that LTC's business is selling chips, and by providing  
a tool that does very fast and very accurate simulations of their  
parts, they increase the chance that an engineer will choose an LTC  
part over a competitor's device.  After all, switchmode power  
supplies can be tricky and an accurate simulation gives one a warm- 
fuzzy feeling that at least the topology and the component selection  
are correct.

Their reason for not opening the format is simple: if one could use  
LTSpice to simulate a TI or National or whoever's part, then  
obviously the engineer could choose the competition as easily as  
choosing the LT part, and THAT is not in LT's interests.

Linear Technology supports LTSpice as a means to an end.  It would be  
nice if LT had standard spice models for their switchers that one  
could use in another program, even if these models were slower than  
the proprietary models.  They DO provide spice models for their  
amplifiers, comparators and linear regulators, but clearly they think  
their switchers are the crown jewels.

-a


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