Re: Circuit to calculate square root of voltage?

From: CFoley1064 (cfoley1064_at_aol.com)
Date: 12/04/04

  • Next message: Ken Smith: "Re: Circuit to calculate square root of voltage?" 
    Date: 04 Dec 2004 04:30:10 GMT

    >Subject: Circuit to calculate square root of voltage?
    >From: Chaos Master ch@os.master.INVALID.INVALID
    >Date: 12/3/2004 9:35 PM Central Standard Time
    >Message-id: <MPG.1c1b0d90982267ab989734@News.individual.net>
    >
    >Hello people.
    >
    >I am looking for a circuit to calculate the square root of a voltage,
    >V(out) = SQRT V(In). (e.g. I input 4V and 2V comes out, I input 3V and
    >~1.73V comes out).
    >
    >Q: How can I do this?

    The square root function can be implemented by placing an analog IC multiplier
    in the feedback loop of an op amp.

    http://www.analog.com/UploadedFiles/Data_Sheets/277093686AD633_e.pdf

    I've had to do this before for a low frequency app, and this solution with this
    IC worked well for me. I believe a sample circuit is in the data ***. Also,
    old issues of AD's Analogue Dialogue have more.

    Good luck
    Chris

  • Next message: Ken Smith: "Re: Circuit to calculate square root of voltage?"
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