implementing clock recovery signal from BPRZ signal

Discussion in 'Embedded Systems and Microcontrollers' started by f@ryal, Jul 20, 2011.

  1. f@ryal

    Thread Starter New Member

    Jul 13, 2011
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    Im trying to implement a recovery clock signal from a bi-polar return to zero signal.................for that purpose im using three comparators............the first one is LM108 which simply gives a high output when non-inverting input is higher than inverting one................................LAter on , 2 other comparators are used in a cascaded ORING configration ..............The resultant or the ORRED output from these two should be a clock signal as per my knowledge.......but im getting simply a high signal.......1,1,1,1,1 so on

    Can anybody suggest me any changes needed in my circuit.can anybody explain me wat actually be the final output look like...............im so confused over it

    Im trying to do its simulation at circuit maker,.....can anybody suggest me what siurce is available in its library to generate a BPRZ signal

    Thanks
     
  2. praondevou

    AAC Fanatic!

    Jul 9, 2011
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    It will help if you post a schematic please !
     
  3. f@ryal

    Thread Starter New Member

    Jul 13, 2011
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    i have uploaded the schematic for my design of clock recovery with the name of UNTITLED..image............plz chk it......is this circuit correct for implementing clock recovery
     
  4. MrChips

    Moderator

    Oct 2, 2009
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    Here is a simple clock recovery circuit:
    [​IMG]
     
  5. cartmenwu

    New Member

    Apr 23, 2008
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  6. praondevou

    AAC Fanatic!

    Jul 9, 2011
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    You could rectify the input voltage with two opamps. The circuit in the picture does not consider any DC-Offset that might exist at the input nor voltage levels etc. Depending on the input/output voltage you have/want, you may need to adapt it with additional TTL/CMOS or CMOS/TTL converters.

    It may also show some unexpected behaviour with high frequencies...:)
     
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  7. neverfail

    New Member

    Jul 26, 2011
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    where can it be found?
     
  8. praondevou

    AAC Fanatic!

    Jul 9, 2011
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    Is this the same subject from your thread "implementing clock recovery signal from BPRZ signal" ?

    If yes, please stay in ONE thread, no point in having multiple threads open on the same problem.

    What about the circuit in post #6 ? Doesn't simple rectification of your signal do what you want?
     
    Last edited: Jul 26, 2011
  9. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    I merged the threads.
    The posts are in time line apearance.

    Bertus
     
  10. f@ryal

    Thread Starter New Member

    Jul 13, 2011
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    yes its working.thanks
     
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