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What's the different between discrete integrator and continuous integrator in circuit implementation

Discussion in 'Electronic Design' started by boki, Oct 9, 2003.

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  1. boki

    boki Guest

    Hi, All:

    1. What's the different between discrete integrator and continuous
    integrator in circuit implementation?

    2. How to classified continuous time filter and discontinuous time
    filter?

    Thanks!

    Boki.
     
  2. Tom Bruhns

    Tom Bruhns Guest

    Mathematically, what's the differnce between an integration and a
    summation? For more information, do a search on "numerical
    integration techniques" and see if it all becomes clear. For even
    more fun, try a discrete integration out on some common functions, and
    see how much different the result is from a true integration of the
    same function. Try different sampling periods. For example, if you
    sample cos(t*2*pi) at t=0,.001,.002,... and integrate that, and then
    compare with sampling the same function at t=0,1,2,..., what do you
    see? You can do the discrete integration easily in Excel, for
    example, or using Matlab or Scilab. If all you have is sampled
    points, how can you know how accurately your discrete integration
    represents the integral of the sampled function? Have you arrived in
    your studies at Mr. Nyquist yet?

    Cheers,
    Tom
     
  3. Robert Baer

    Robert Baer Guest

    Sounds like questions for a test in a class.
    How does one make an integrator?
    Use an opamp, a capacitor, and a resistor.
    What are the problems with that?
    How about input bias current charging up the capacitor?
    What does that mean?
    How do i prevent that charging or remove that charge (and how often)?

    you supply the answers.....

    Perhaps they will give illumination to the seond quiz question you
    gave.
     
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