[sdiy] Simple squaring circuit

[Osamu (Sam) HOSHUYAMA]

Hello Rene,

How about "Log-Exp" approach?

  exp(2*log(abs(x))) = x^2

  Input -> [Full wave rectifier] -> [log] -> [*2] -> [exp] -> Output

RMS detector by THAT may be inspiring.

http://www.thatcorp.com/datashts/600032-1.pdf

If you can used matched diodes, what you need after rectifier are
one opamp and two diodes for logarithm function and multiplication, 
and one opamp and one diode for exponential function.

Best,  Sam Hoshuyama

René Schmitz wrote:
> 
> Hi all,
> 
> I'm looking for a simple squaring circuit. Preferably something
> simpler than a ringmodulator with both inputs tied together.
> 
> Cheers,
>  René

> 
> --
> uzs159 at uni-bonn.de
> http://www.uni-bonn.de/~uzs159
> 
> 

-- - ---  - -- ------ - -------- -- - ---- -
Osamu (Sam) HOSHUYAMA      houshu at rogers.com
                              Ottawa, CANADA
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