[sdiy] ad844 current feedback amplifier??

[Speth, John]

> > In short the current-feedback op-amp has little to offer the
> audio market,
>
> That's my impression too.
>
> I recall that Serge used the LM3900 a lot, and am curious about
> what his thinking was on that.
>
> The other main place I recall it showing up is in a four-pole ARP
> filter; see Don Tillman's awesome synth patent page:
>
> http://www.till.com/articles/arp/patents.html#US04011466

Historical tidbit: The PAIA modules designed in the 70s used the LM3900 in many designs.  IIRC, the LM3900s were used in the VCA, VCO, VCF, and sequencer.  In the sequencer, I think LM3900s were used as shift registers.  You could tell it was the designers' (John Simonton, perhaps) favored part.  See http://paia.com/manuals/

While following this thread I was wondering if a "current feedback amplifier" is another name for a "Norton amplifier" which is the LM3900's moniker.  Does anyone know if they're the same?

National Semi has a very old and quite extensive app note for the LM3900.  See http://www.national.com/an/AN/AN-72.pdf.

JJS


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