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RC Differentiator

Discussion in 'Electronic Basics' started by Hugo Caballero Figueroa, Oct 9, 2003.

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  1. Hi! =) Just a question...

    In an RC differentiator:

    ----------------C------------------|-----------
    |
    Vin R V
    |
    ___________________________|________

    we have:

    C * d/dt (Vin-V) = V / R

    --> RC * d/dt (Vin-V) = V

    if:

    dV/dt << dVin/dt

    --> RC * dVin/dt = V

    I have read that we have to choose RC small in order to assure that

    dV/dt << dVin/dt

    Why is dV/dt much smaller than dVin/dt if RC is small enough?

    Thank you in advance.

    figueroa
     
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