[sdiy] Squaring volts

[M.A. Koot]

Hi everybody,

I'm working on a project trying to make the van der Pol osscilator in analog
electronics. To realize the circuit of the "negative resistor", I have
developed a system wich involves squaring of the analog signal.
It really seems this is needed. Now, the only way I know how to square an
analog signal is using a ring modulator circuit with equal inputs. Though
this really seems a clumsy way to achieve the squaring, and I'm also not
sure if it would work.
So I was wondering if anyone might know a better way to square an analog
signal (these signals are not all 1 or so..)
Does anyone maby know some analog chip to do this? Or is ring modulating
really the way to do it? I tried using a VCA chip though (SSM2024 I
thought), but these ones are only DC, and I have AC signals..
I hope anyone could help me.

Thanks!,
Michiel Koot

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