[sdiy] On the topic of ring modulation (Using FETs instead of diodes?)

[Ove Ridé]

I just watched this video and got reminded of the diode ring mixer
topology of ring modulators.

https://www.youtube.com/watch?v=junuEwmQVQ8

As mentioned in the video, the diode ring mixer has the issue that
there are dead spots when the carrier is near zero, because of the
diode turn on threshold. This got me thinking, what if you instead
used FETs, perhaps driven by a comparator, instead of diodes? This
should, if done well, get rid of that non-linearity, as far as I can
tell.

And to ask a slightly different question, how would one design a high
quality analog ring modulator for audio frequencies, using modern,
jelly bean parts? (That is, non-specialized parts, as well parts that
didn't go out of production 10-20 years ago.)

-- 
/Ove

Blog: <http://blog.gg8.se/>

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