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harrybissell <harrybissell at prodigy.net> wrote on 10/05/2004, 07:33:26
AM:
> Nicolai Czempin wrote:  
> 
> >
> > Let me explain briefly why I won't be using the 4069-based design for
> > now....
> >
> >  the mere fact that it is a CMOS-gates-based design makes it a step up from
> > the
> > basic analog stuff...
> >
> > Now, it may seem that I'm contradicting myself, by using op-amp-based
> > designs. Perfectly correct, and I *will* want to build a VCO using
> > discrete components. I guess I'm drawing an arbitrary line at the
> > analogue vs. digital border for now....
> >
> > That's why I called the circuit "impure" BTW (tongue-in-cheek, of
> > course), in case you hadn't realized.
> >
> 
> Actually, you should consider the "4069 hex inverter" to be as an
> analog array of six PMOS/NMOS pairs of transistors fabricated on
> a single (monolythic) substrate. Check out the data sheet, that is
> EXACTLY what you are getting.
> 
> Yes.. some unenlightened folks would call that a "digital" function...
> but we analog designers know better   :^P
> 
> The 4007, 4049, and the 4069UB are all basically transistor arrays.
> A very large portion of the "classic" synthesizer designs uses these
> parts as analog components. RCA even included some of these in their
> ANALOG data books (of yore...)
> 
> What could be more 'pure' ???
> 
> H^) harry