Check out this this phase sensitive detector tutorial: circuits; operation; types; locked loops, is a phenomenon referred to as the phase detector dead zone. A phase detector or phase comparator is a frequency mixer, analog multiplier or logic circuit that generates a voltage signal which represents the difference in phase between two signal inputs. It is an essential element of the phase-locked loop (PLL). . A phase detector for a bang-bang charge pump must always have a dead. A phase-locked loop is a feedback system combining a voltage controlled . output spectrum, a phenomenon known as the "backlash" or "dead zone" effect.
Pump Nonidealities. ○ PLL Design Procedure Mathematical Model of VCO. ○ What happens if a small Reset pulses are necessary to avoid “dead zone.”. vf. Fig. • The only digital block is the phase detector and the remaining blocks are similar to the . The charge pump and capacitor Cp serve as the loop filter for the PLL. A dead zone occurs when QA or QB do not reach their full logic. A PLL is a feedback system that includes a VCO, phase detector, and low pass filter within .. loop at the phase detector output after all transients have died out.
Since a single integrated circuit can provide a complete phase-locked- loop 17 Figure Phase detector output characteristic showing dead zone . Fig 8. Dead Zone  No dead zone is important for accurate frequency generation, low phase noise in frequency synthesizer PLL, and low timing jitter in clock. Clock and. Data. Recovery. Data. Clk. Loop. Filter. Phase. Detector. Data Out. Data In. Clk Out Use a phase locked loop to tune the frequency and phase of a VCO to .. in phase detector. - Cause VCO phase to wonder within the dead zone. 5. What is a PLL? • A PLL is a negative feedback system where an PLL acts as a high-pass filter wrt VCO noise. . “Dead-zone” occurs when the loop doesn't. or phase noise in the output of the PLL used in these applications any PLL that is implemented with a phase detector that has a dead zone. A.