A low voltage all-digital on-chip oscillator using relative reference modeling

Chien Ying Yu*, Jui Yuan Yu, Chen-Yi Lee

*Corresponding author for this work

Research output: Contribution to journalArticle

14 Scopus citations


This paper presents a low voltage on-chip oscillator which can compensate process, voltage, and temperature (PVT) variation in an all-digital manner. The relative reference modeling applies a pair of ring oscillators as relative references and estimates period of the internal ring oscillator. The period estimation is parameterized by a second-order polynomial. Accordingly, the oscillator compensates frequency variations in a frequency division fashion. A 1-20 MHz adjustable oscillator is implemented in a 90-nm CMOS technology with 0.04 mm 2 area. The fabricated chips are robust to variations of supply voltage from 0.9 to 1.1 V and temperature range from 0 °C to 75 °C. The low supply voltage and the small area make it suitable for low-cost and low-power systems.

Original languageEnglish
Article number5989887
Pages (from-to)1615-1620
Number of pages6
JournalIEEE Transactions on Very Large Scale Integration (VLSI) Systems
Issue number9
StatePublished - 1 Jan 2012


  • and temperature (PVT) variations
  • Digitally controlled oscillator (DCO)
  • frequency compensation
  • low voltage
  • oscillators
  • process
  • voltage

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