[sdiy] SSM2164 to use as ring modulator...

[Neil Johnson]

Hi Olivier,

> I'm curious about how this could be achieved with just a linear VCA.
> By adding a DC offset to the modulator so that it remains positive,
> and then removing the corresponding fraction of the carrier from the
> output?

Yes, its a technique that's been known and used for at least 30 years.
 Check the LM13700 datasheet, e.g. figure 27:

    http://www.ti.com/lit/ds/symlink/lm13700.pdf

Or this magazine article on page 8:

    http://www.idea2ic.com/LM13600/UsingOTAs2.pdf

Note: www.idea2ic.com is the website of Don Sauer, one of the two
designers of the LM13700.

Neil
--
http://www.njohnson.co.uk