Digital controlled oscillator (DCO) for all digital phase-locked loop (ADPLL) – a review

Florence Choong*, Mamun Ibne Reaz, Mohamad Ibrahim Kamaruzzaman, Md Torikul Islam Badal, Araf Farayez, Maria Liz Crespo, Andres Cicuttin

*Corresponding author for this work

Research output: Contribution to journalReview articlepeer-review

2 Citations (Scopus)
2516 Downloads (Pure)


Digital controlled oscillator (DCO) is becoming an attractive replacement over the voltage control oscillator (VCO) with the advances of digital intensive research on all-digital phase locked-loop (ADPLL) in complementary metal-oxide semiconductor (CMOS) process technology. This paper presents a review of various CMOS DCO schemes implemented in ADPLL and relationship between the DCO parameters with ADPLL performance. The DCO architecture evaluated through its power consumption, speed, chip area, frequency range, supply voltage, portability and resolution. It can be concluded that even though there are various schemes of DCO that have been implemented for ADPLL, the selection of the DCO is frequently based on the ADPLL applications and the complexity of the scheme. The demand for the low power dissipation and high resolution DCO in CMOS technology shall remain a challenging and active area of research for years to come. Thus, this review shall work as a guideline for the researchers who wish to work on all digital PLL.

Original languageEnglish
Pages (from-to)29-40
Number of pages12
JournalJurnal Teknologi
Issue number1
Early online date25 Dec 2019
Publication statusPublished - 2020


  • All digital phase-locked loop (ADPLL)
  • Complementary metal-oxide semiconductor (CMOS)
  • Digital controlled oscillator (DCO)
  • Low power
  • Phase-locked loop

ASJC Scopus subject areas

  • General Engineering


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