On 27/05/2011 15:58, M.L. wrote:
> This is getting very complicated very quickly. Maybe not to us who
> design electronics, but to describe this parametrically with equations
> in a complete and unambiguous seems very very tedious and complicated.
>
> Electronic parametric EDA seems to be adding a time dimension to your
> example of parametric 3D modelling such as Solidworks. In Solidworks
> you create 2D drawings and extrude or cut. Now imagine if you not only
> had to design a single 3D part, but also describe how they interact,
> then add electrons and semiconductors that behave in non-mechanical
> ways.
>
> An interesting idea -
> It might be more complicated than just having the design engineer redo
> the calculations.

Also
200V fast diodes used as varicaps on VCOs
1N4007s power diodes use as "PIN" forward bias RF attenuators, current=20
controlled AGC RF/IF amps
Transistor used in CE avalanche breakdown as pulse generator
temperature coefficient of a particular Zener used to track BJT or FET=20
on heatsink part of bias


We have a thing called Spice that's sometimes used. Some schematic=20
Capture packages can output to it. Most link schematic to multiple=20
package variants for PCB layout and even automatic 3D visualization of=20
product (Autotrax EDA, Eagle plug ins). Even Thermal modelling on some=20
packages.
Since about 1983 I've been using PC Schematic capture that outputs=20
netlist & parts for separate PCB package and BOM.

If you have the money there is no shortage of good tools.

Some good ones are cheap or even free.
--=20
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