seperate negative and positive pulse

Discussion in 'Homework Help' started by thong, Nov 20, 2005.

  1. thong

    Thread Starter New Member

    Nov 20, 2005
    2
    0
    Hi,

    i have a signal in with positve and negative pulse, how to seperate them into 2 waveforms, one with positve only and other one with negative


    Thanks
     
  2. n9352527

    AAC Fanatic!

    Oct 14, 2005
    1,198
    3
    This type of signal is common in some communication/modulation systems. If the frequency is pretty low and the signal is strong then a few signal diodes would do the job. But if you need to operate at high frequency or worry about loading the signal source then you need to use opamps to separate the pulses.
     
  3. thong

    Thread Starter New Member

    Nov 20, 2005
    2
    0
    Thanks for replying. I'm really weak on analog thinggy, Could you please give more detail on it.

    Thanks again
     
  4. n9352527

    AAC Fanatic!

    Oct 14, 2005
    1,198
    3
    A simple two diodes circuit is attached.
     
  5. Brandon

    Senior Member

    Dec 14, 2004
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    0
    OpAmps are terrible for comms I thought. I remember seeing their low roll of freq due to their internal cap. Typicall 20-40Khz.

    Isn't basic comm stuff in the Mhz range?
     
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