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Flat delay network (butterworth)

Discussion in 'Electronic Design' started by cali_eng, Sep 10, 2006.

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  1. cali_eng

    cali_eng Guest

    it want to obtain a maximally flat delay network which provides taps
    corresponding to different amounts of delay. these taps are fed to
    networks with constant input impedances of different amounts. is there
    any method to achieve this result?
  2. Joerg

    Joerg Guest

    cali_eng wrote:

    Hard to say without any data. Like how many nsec per tap, maximally flat
    to which frequency etc.

    Anyhow, you can buy delay lines (Belfuse and others).
  3. Yes; the realization may be anywhere from moderately difficult to
    marginally less than impossible.

    You must give more data. Much more data. No, MORE!!!

    Frequency range, amount of delay required, range of input impedances
    would be a START, no more than that. But it would be a start.
  4. Guest

    For a maximally flat delay network, consider a thousand-foot spool of
    CAT6 cable; there
    are four wire pairs (i.e. 4 microseconds of delay), and it's pretty
    good broadband.

    You need to feed it at the characteristic impedance (use amplifier
    and/or attenuators
    with 110 ohm differential output), and terminate it properly. And if
    you need to tap it
    in the middle, you gotta splice in either a high-impedance shunt sense
    amplifier, or
    a low-impedance (transformer-coupled?) series sense amplifier.

    For longer delays, PAL TV sets use an acoustic wave device (looks like
    a slab of glass
    with piezoelectric microphones cemented on), and waves in a Slinky can
    several seconds (per Slinky, that is).

    There are commercial 'delay lines' but these are generally
    lumped-constant approximations,
    you won't like what the waveforms look like.
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