SV: Re: Re: [sdiy] THE LM13600/LM13700 STORY

[karl dalen]

--- "JH." <jhaible at debitel.net> skrev:

> >> >http://www.idea2ic.com/LM13700.html
> >>
> >> No!  Hadn't seen that.  Thanks for posting.
> >>
> >> Sorta a sad story, though.  If they had spent another five minutes on it,
> >> maybe it could have been as good as the CA3280.
> >
> >Indeed, it almost sounded in his description that they
> >copied the ca3080 more or less!
> 
> Which isn't a bad thing - I always used it for a 3080 replacement.

> The claim of having designed this in - what? - 5 minutes may seem a little 
> exaggerated, _especially_ when you consider that clever implementation of 
> the linearisation diodes that is considerable different from a 3280 in that 
> it uses resistors instead of current sources, and still works pretty well.
> It may explain the more than sloppy description in the data sheet, though, 
> where all the explanation _is_ made with reference to current sources!

Clever!? Well, a copy can be done in less then 5 minutes! ;-)

However perhaps not entirely unlikely the diode distortion principle could
have been known among the upper cast of analog silicon design at the time!?
The OTA cell still are the basic OPAMP input stage!

KD





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