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Exponential charging v linear output

  • 03-01-2013 10:20AM
    #1
    Squ
    Closed Accounts Posts: 1,082 ✭✭✭


    Gents,

    As the charging time of a capacitor is exponential, how then is the output of an integrator linear?

    Thanks.
    S


Comments

  • #2
    whizbang
    Registered Users, Registered Users 2 Posts: 2,051 ✭✭✭whizbang


    Charging of a cap from a constant voltage is exponential.
    Constant Current charging is linear.
    but most simple circuits use such a small portion of the charge curve, that's its ok to call it linear


  • #3
    Squ
    Closed Accounts Posts: 1,082 ✭✭✭Squ


    whizbang wrote: »
    Charging of a cap from a constant voltage is exponential.
    Constant Current charging is linear.
    but most simple circuits use such a small portion of the charge curve, that's its ok to call it linear
    Thank you for that.

    I'm doing an online basic electronics course, and the query popped out at me..

    Tutor couldn't help!

    Cheers,

    S


  • #4
    Chet T16
    Registered Users, Registered Users 2 Posts: 2,325 ✭✭✭Chet T16


    Taking a small section as being linear is common across all sorts of non linear devices. Google small signal model and you'll find plenty of info.

    What course are you taking?


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