Re: gEDA-user: passing parameters to a subckt

[kai-martin knaak <kmk@xxxxxxxxxxxxxxx>]

kai-martin knaak wrote:

> John Doty wrote:
> 
>> http://www.gedasymbols.org/user/john_doty/models/opamp/
>>
>> Have fun! Feedback welcome.
> 
> Thanks!
> Such simple models are what it takes as a starting point.
> I will try the models for a second stab toward simulation rather than with
> ltspice. Will report my milage on the list and/or add to the simulation
> page on the geda wiki.

No mileage, yet, but I looked at the model file. The CA3080 is simulated 
from transistor level. Part of the magic is the definition of the transistor 
parameters. The comment says you applied "Pspice/Parts to the specs of a 
CA3096 array" to get the values of the transistors. Does this mean, that  
Pspice has a way to guess the value of transistors from the specs of a whole 
circuit?

How would one go about to get the equivalent for, say, the abundant OP07?

A note on the "dirty" opamp model, CA3080. Unfortunately, this particular 
component is not only obsolete but has a non standard configuration. Pin 5 
is "amplifier bias input" and needs to be connected to some proper value. 
(correct me, if I am wrong) This is less then ideal for distribution in a 
getting-started selection of models. Ideally the chosen component would be 
widely used and be pin compatible to a maximum number of other opamps.

---<)kaimartin(>---
-- 
Kai-Martin Knaak
Ãffentlicher PGP-SchlÃssel:
http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x6C0B9F53



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