Analog multiplier/squarer fundamental attenuation

[g3rmanium]

Hey.

So I bought a frequency generator, hooked it up to my X² squarer and looked at the fundamental and it was more than 35 dB below the squared signal.



I guess that is a lot more than your average full-wave rectifier?

[Paul Perry (Frostwave)]

That is certainly good for a frequency doubler, but a mere 35dB rejection of carrier would not be quiet enough for a ring modulator in general. The question is, can you hear the carrier being swept through the audio band, while there is no input?
It's a battle (layout) to get a really good result.

On the other hand, it's surprising how well some people have done with the traditional transformer & diode ring modulator. But that is far too labor intensive for me, and the transformers limit the carrier range. (the AD633 is happy right down to DC, of course!)

[g3rmanium]

That is certainly good for a frequency doubler, but a mere 35dB rejection of carrier would not be quiet enough for a ring modulator in general. The question is, can you hear the carrier being swept through the audio band, while there is no input?

It's a multiplier, not a ring mod. :-)

(the AD633 is happy right down to DC, of course!)

I saw that, too. Swept all the way down to 10 Hz or so and got 20 Hz out.

[Paul Perry (Frostwave)]

Yeah, I know it's a multiplier. Now play a chord through it.

[g3rmanium]

Yeah, I know it's a multiplier. Now play a chord through it.

Done. 

[Paul Perry (Frostwave)]

Nice clip, Johann!
Now I will have to add a switch to my ring modulator, to convert it to a squarer 

[g3rmanium]

Nice clip, Johann!
Now I will have to add a switch to my ring modulator, to convert it to a squarer 

The world clearly needs more octave-up.

[oldschoolanalog]

The world clearly needs more octave-up.