square rooter

fadY

New Member

• Apr 18, 2003

• #1

hi,
I am looking for a circuit that takes the square root of input voltage. I would like it to work with a flat response for audio frequencies (100Hz-16kHz) and to be as simple as possible.

thanx

fady

 

S

stevez

Active Member

• Apr 18, 2003

• #2

I think that in the days of analog computers there were common blocks for that sort of thing. This one is killing me because somehow I think the answer is so simple that it's hard. TGIF.

 

S

stevez

Active Member

• Apr 18, 2003

• #3

See page 22 - it's a start. It's a root extractor.

https://www.electro-tech-online.com/custompdfs/2003/04/AN-31.pdf

 

fadY

New Member

• Apr 22, 2003

• #4

thanks for this circuit, I already had another one with a logarithm extractor a 1/2 gain and an exponentiator.
actually exp(1/2log(x))=sqrt(x) but I find it not being very steady...