PM circuit design

Discussion in 'General Electronics Chat' started by Ataleph, Jun 16, 2011.

  1. Ataleph

    Thread Starter Active Member

    Apr 20, 2009
    Hi all,
    I need a help with design of a PM circuit. I have a differential fast clock (carrier) coming out of differential buffer. Additionally I've got an uncorrelated sine wave source (modulator) which alternates much slower than clock. I need to combine the both to get a PM circuit that should output a differential modulated clock. Any ideas for concept?
  2. ifixit

    Distinguished Member

    Nov 20, 2008
    Hi Ataleph,
    1. PM? Pulse Modulated or Phase Modulated?
    2. What is the clock frequency?
    3. What is the modulation frequency?
    If Phase Modulation, then a PLL (phase Locked Loop) may do the job. Use the modulation signal to pull the VCO out of phase with its reference input without pulling it out of lock.

    To de-modulate it, a similar PLL circuit with different filter parameters can be used.