small planet

[Roel Das]

I'm not an old timer, but I'll try anyway.

Vcc indicates for the voltage at the collector compared with ground.
Vee, Vss and Vdd: about the same.

Vce is used for voltage between collector and emittor and so on...

Hope this helps... (And hope it's true too... 8-)

Roel.


----- Oorspronkelijk bericht -----
Van: "Martin Czech" <czech at Micronas.Com>
Aan: <synth-diy at node12b53.a2000.nl>
Verzonden: donderdag 20 april 2000 15:26
Onderwerp: small planet


> The world is a small planet. The LDR book is still on my desk, a
> colleague walks in, he sees the book and tells me that he worked for
> Valvo in another life and that he edited this very book!
>
> Now to my question.
>
> We often see supply pins labeled with Vcc,Vee,Vss,Vdd.  I believe that
> the indices mean collector, emitter, source and drain.  I believe that
> the writers/artists have npn or nmos transistors in mind when labeling
> drawings with this, So Vdd and Vcc means positive supply, Vee and Vss
> negative. This can be different for PMOST-techologies (BBD). But nobody
> told me so, and I have never seen a text saying so.
>
> Is this so?  Who invented this notation?
>
> People start to mix it up, I've seen Vee and Vdd together , which makes
> not much sense for a CMOS chip then.
>
> Since this is a small world, perhaps anybody knows some of the responsible
> old timers ?
>
> m.c.
>
>