NEED help on ULTRA LOW jitter amplification

Discussion in 'General Electronics Chat' started by abforce, Feb 13, 2014.

  1. abforce

    Thread Starter New Member

    Nov 14, 2013
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    Hello Gurus:

    I want to amplify a pair of LVPECL signals to -1,+1 volte. They are generated by CDCLVP1102 with about 5ps jitter. I used a subtractor scheme built by a THS4215D. Power supply is +-5 volte.

    Now I got a square as I want but with a jitter being about 10 ns. Is there anyway to reduce this jitter?

    I want the LVPECL signals being amplified, or , being compared to be a square wave with as low jitter as possible. I think comperators can do the same job but the delay is annoying and I don't have idea how well they can perform.

    Thanks for all kinks of help and if you have something to ask, I will reply you with my best effort. If it's not tonight, it must be tomorrow.
     
  2. abforce

    Thread Starter New Member

    Nov 14, 2013
    19
    0
    Does anyone got interest in this problem?
     
  3. crutschow

    Expert

    Mar 14, 2008
    13,056
    3,245
    Yes, I have an interest but I haven't come up with a good solution to your problem. If a high speed op amp won't work, I'm not sure what will. Perhaps this will give you some ideas.
     
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  4. abforce

    Thread Starter New Member

    Nov 14, 2013
    19
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    Thank you for you advise! I think it's a quite interesting suggestion! I saved the datasheet and it will be a backup solution for me now. In fact I am only a green hand and I think there should be some 'know how' points to improve the performance and I just don't know them and let the OPAMP perform not as well as it could be.
     
  5. Tesla23

    Active Member

    May 10, 2009
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  6. abforce

    Thread Starter New Member

    Nov 14, 2013
    19
    0
    Thank you! I see the devices and they have really low jitter. I am building a trigger that follows a LVPECL signal while delivers a single end ±1 signal as out put. It will drive a timing system. The requirement is just to be fast and low jitter. So I think delay for those devices is a problem in my case.
     
  7. Tesla23

    Active Member

    May 10, 2009
    318
    67
    Now I really don't understand! The ADCLK914 has a delay of around 160ps, whereas the THS4215D takes 2ns to change from -1V to 1V. The ADCLK914 has a bandwidth around 7.5GHz, the THS4215D has a bandwidth of 350MHz. If 160ps of delay is a problem, then the THS4215D is not the answer. What sort of delay can you tolerate?
     
  8. russ_hensel

    Well-Known Member

    Jan 11, 2009
    818
    47
    I am not very knowledgeable in this stuff but I think there may be a confusion between jitter and delay. As I understand it jitter is random variation in timing, delay is just delay. Perfectly repeatable delay would have no jitter. for ADCLK846 the delaly is 2 ns but jitter seems to be below 100 fs. I may have this wrong.
     
  9. abforce

    Thread Starter New Member

    Nov 14, 2013
    19
    0
    I agree with you. Jitter is the issue I want to solve and delay is not the price I want to pay, or say, if not necessary. That's the reason why I chose to use an Op-Amp at first.
     
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