Designing delay elements

Discussion in 'Homework Help' started by kidkwik, May 23, 2011.

  1. kidkwik

    Thread Starter New Member

    Oct 13, 2010
    How would one go about designing a delay element for a specific range of frequencies with less than a certain amount of error in the gain and phase?

    I was thinking of bandpass filter, but i'm not sure if that is considered a delay element.
  2. Georacer


    Nov 25, 2009
    What are you trying to delay? Specific frequency signals by an amount of time, or by a specific phase delay?
  3. steveb

    Senior Member

    Jul 3, 2008
    You actually need an "allpass" filter. The allpass filter tries to keep a nearly unity magnitude over a broad frequency range. Then a nearly linear phase shift vs. frequency (over some band) gives an effective time delay.

    Georacer's questions are very relevant, by the way. Depending on your answers, the above link might be helpful. Or, perhaps a simple small transmission line is all you need. Or, maybe you need a digital filter implementation.
  4. kidkwik

    Thread Starter New Member

    Oct 13, 2010
    Thank you both for the replies, but the question is pretty vague.

    Design a delay element for a range of 0 < f <10 Hz, with less than
    1 % error in the phase and gain.

    Yeah, it's suppose to be a digital filter.