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Details of Sigma-Delta Modulator Design

Discussion in 'Electronic Components' started by Tim Wescott, Apr 12, 2004.

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  1. Tim Wescott

    Tim Wescott Guest

    I'm trying to explain the functioning of sigma-delta modulators. I've
    got a good handle on how to build a decent 1st-order S-D modulator, but
    I'm light on practical details of 2nd-order ones.

    The information to be found by Googling gets me lots of general
    statements about "2nd order is better because of the extra integrator",
    along with pretty graphs that have no numbers on their axes. This is
    very good for the manufacturers trying to sell S-D ADCs and DACs, but it
    doesn't help me much.

    I assumed that it would be fairly easy to whomp up a 2nd-order S-D
    modulator simulation to find this all out, but so far I'm only building
    modulators that perform worse than their 1st-order cousin.

    Is there any specific information out there, either on the web or in
    print, that give some concrete examples of how to arrange a 2nd-order
    S-D modulator so that it actually _outperforms_ a 1st-order example?

  2. Ian Buckner

    Ian Buckner Guest

    Richard Schreier has contributed a Matlab toolbox for
    simulating high order sigma delta converters. It is available
    on the Mathworks site and a number of other places.
    google on "Schreier toolbox delta sigma".

  3. Roy McCammon

    Roy McCammon Guest

    Crystal Semiconductor (later bought by Cypress) used to have
    very good app notes on this subject. The app notes might
    still be available, or maybe someone has an old Crystal data
    book with the app notes.
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