DPLL with Phase Frequency Detector with Charge Pump Output

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Description

The CMOS implementation of a DPLL using the Phase Frequency Detector with this configuration is preferred over the tri-state output, because of the better immunity to power supply variation. This SPICE simulation shows how too small values of the loop damping factor affects the loop, creating trouble locking.

  • Free
  • Advanced
  • >100
  • LTspice
  • IV
  • No
  • transient input voltage VCO, below data clock and dclock reducing R1 the loop filter resistor the dumping factor is 0,1 and the loop has trouble locking

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