Decoupling or Bypass Capacitors

Discussion in 'General Electronics Chat' started by 0by1, May 12, 2011.

  1. 0by1

    Thread Starter New Member

    May 10, 2011
    11
    0
    Hello,

    I have following doubts about Decoupling or Bypass Capacitors, please clarify

    (1) Different b/w Decoupling or Bypass Capacitor in one line.

    (2) For a MPU or any IC having 'N' Vcc (say 3V) pins how many caps i have to use ??


    Thanks in advance.
     
  2. bertus

    Administrator

    Apr 5, 2008
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  3. 0by1

    Thread Starter New Member

    May 10, 2011
    11
    0
    Ya Bertus,

    I have studied that, but for (2) question i didn't get the answer.
    In some circuits they use 1 cap for 2 Vcc pins but in some circuit they use 1cap per 1 Vcc pin, why is that?

    Ans for(1) :According to me both are capacitors with different name depending on
    -their frequency characteristics (diff. value)
    -place where it is used.
    am I right???
     
  4. Wendy

    Moderator

    Mar 24, 2008
    20,765
    2,536
    A lot of it depends on how noisy the circuits are, and how noise critcial they are. Many cases it works out it is cheaper to have a few extra 1¢ parts than to have it occasionally become intermittent due to noise issues.
     
    0by1 likes this.
  5. nbw

    Member

    May 8, 2011
    36
    10
    My personal preference is to slap a 0.1uF cap across the supply and ground for each IC I use, for the very small cost and space of the caps, it's well worth it in eliminating little glitches that digital chips in particular don't like.
     
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