[sdiy] Bending a Sum

David G Dixon dixon at mail.ubc.ca
Mon Nov 18 19:13:44 CET 2013


Tom, the linearizing part of the Irwin circuit is just a logarithmic
amplifier, so....  Of course, it also perfectly compensates the TC of the
2164 cell doing the business.

> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl 
> [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Tom Bugs
> Sent: Monday, November 18, 2013 5:30 AM
> To: Synth-DIY DIY
> Subject: [sdiy] Bending a Sum
> 
> Just wondered if anyone may have a brainwave on this little problem...
> 
> It is around the area of linearizing the response of an 
> SSM2164 - but, at the moment (blah blah) I wanted to see if I 
> can achieve a rough linearization WITHOUT using the well 
> documented Irwin EDM technique.
> 
> http://bugbrand.co.uk/images/SumBend.jpg
> 
> I just have a simple opamp sum stage to generate 5V to 0V 
> from a 0V to 10V control - that's the green line.
> The standard linearization technique achieves the blue line.
> How could I bend green to blue without too much extra 
> complexity and, crucially, without using another 2164 cell?
> 
> Thanks!Tom
> 
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