Electronics > Beginners

Any way to change a linear DC voltage to a x^2 response?

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K3mHtH:
So there's a bunch of ways I can ask this question, but I hope the title makes the most sense. I have a voltage that goes from 0-5V with a linear response and I want it to still go from 0-5V but have a x^2 response.

I've found a few circuits that can convert to an exponential response, but that is 2^x correct? That's very drastic and I'm just looking for something to do x^2 - or basically, to multiply the voltage by itself (and obviously pad the output so it doesn't go to +25V). I couldn't even find any circuits that do voltage multiplication... so maybe I'm searching for the wrong terms.

james_s:
What you need is an op-amp, that's exactly what they were developed to do, perform mathematical operations.

edavid:
The correct search terms are "squaring circuit" or "analog multiplier".

A popular IC you could use is the AD633.

However, it's usually best to do it digitally - a microcontroller with ADC and DAC built in will do the job better than any analog circuit.

JustMeHere:
Probably not exactly what you want, but it is a good watch:

EEVblog #469 - Cockcroft-Walton Multiplier - YouTube   

K3mHtH:
Thanks james,
do you have any example circuits showing an opamp squaring or multiplying?

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