[sdiy] OTA to voltage-control resonance?

[Jerry Gray-Eskue]

Ian,

Thanks for sharing these reference. They contain a wealth of information.

Obviously we have a number of OTA experts on this list, I was wondering if
anyone would care to comment on the merits of the "Logarithmic Current
Source" shown in figure 30 of the National LM13700 data sheet.

I see that PAIA is using a variation of this circuit and claims that the use
of the linearizing diode provides temperature compensation.

http://paia.com/ProdArticles/9700faq.htm

- Jerry

-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl]On Behalf Of Ian Fritz
Sent: Sunday, August 30, 2009 9:06 PM
To: David G. Dixon
Cc: Synth-diy at dropmix.xs4all.nl
Subject: RE: [sdiy] OTA to voltage-control resonance?



>  a decent source of
>information about OTAs which would help us to understand the statements you
>have made in the preceding paragraph?  The LM13700 datasheet simply isn't
>doing it for me.

Here is one I like, since it covers many possible configurations:
http://amesp02.tamu.edu/~sanchez/ota-Tutorial1.PDF

And some others:
http://amesp02.tamu.edu/~sanchez/2-integrator-OTAs.pdf
http://amesp02.tamu.edu/~sanchez/Non-linear-OTA.pdf
http://et.nmsu.edu/~etti/winter98/electronics/grise/wrg.html

Should get you started.

Ian

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