Recover PWM

Discussion in 'General Electronics Chat' started by roboticvn, Jul 18, 2014.

  1. roboticvn

    Thread Starter Member

    Jul 9, 2014
    47
    0
    I want to make a recover PWM circuit. Frequency of triangle wave is 15MHz. Can you show me a circuit for this job? I found this circuit (figure b)
    [​IMG]
    Can I use OPA705? I read it's datasheet and see that it's GBW just 1MHz. Is that satisfying for 15MHz of input signal?
    I hope you will help me. Thank you^^
     
  2. Sensacell

    Well-Known Member

    Jun 19, 2012
    1,132
    267
    What is the signal you are trying to recover?

    Audio?

    Video?
     
  3. roboticvn

    Thread Starter Member

    Jul 9, 2014
    47
    0
    That is video signal (figure b). Can you help me?
     
  4. roboticvn

    Thread Starter Member

    Jul 9, 2014
    47
    0
    Help me!!!
     
  5. Veracohr

    Well-Known Member

    Jan 3, 2011
    552
    76
    No. Gain-bandwidth product of 1MHz means the gain can't be more than 1 (ie. unity) at 1MHz. Which means 15MHz will be attenuated.
     
  6. AnalogKid

    Distinguished Member

    Aug 1, 2013
    4,546
    1,252
    Don't you mean "Help me, please."?

    No, you help me. The description of the problem is very poor. You assume that a bad picture of a pc board will tell us everything you already know. It doesn't.

    What do you mean by "recover". Recover what? Why? What is your application? What power supplies are available to power the circuit? What kind of output do you want? Are you just converting a pulsed light stream into electrical pulses, do you want to convert the signal back to real video, or what?

    ak
     
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