A low-power, differential relaxation oscillator with the self-threshold-tracking and swing-boosting techniques in 0.18-μm CMOS

Shao Yung Lu*, Yu-Te Liao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

This paper presents a fully integrated, 8.2-MHz relaxation oscillator with a self-threshold-tracking loop and swing-boosting technique for improving its long-term frequency stability and noise performance. The proposed latch-based relaxation oscillator increases the transition speed to reduce the static power consumption. To decrease the process-voltageerature dependence, we propose a self-threshold-tracking loop to ensure that the transition point of the inverter-based comparator is set to a fixed ratio of the supply voltage. In addition, the comparator delay can be compensated by the tracking loop, relaxing the requirements of comparator power consumption. The design is implemented in a 0.18-μm CMOS process. The design achieves a period jitter of 7.66 psrms, the phase noise of-109 dBc/Hz at an offset frequency of 100 kHz, and an Allan deviation noise floor of 1.56 ppm. The resultant figure of merit is 160.8 dBc/Hz, while only consuming 46.3 μW. The power efficiency of the design is 5.6 kHz/nW. As for the supply sensitivity, the design achieves 0.9 %/0.1 V, which is 10 × lower than the design with no compensation loop. The measured temperature coefficient of the proposed oscillators is 123 ppm/°C from-20 °C to 100 °C without any trimming process.

Original languageEnglish
Article number8558702
Pages (from-to)392-402
Number of pages11
JournalIEEE Journal of Solid-State Circuits
Volume54
Issue number2
DOIs
StatePublished - 1 Feb 2019

Keywords

  • CMOS
  • low power
  • relaxation oscillator
  • self-threshold-tracking loop
  • swing boosting

Fingerprint Dive into the research topics of 'A low-power, differential relaxation oscillator with the self-threshold-tracking and swing-boosting techniques in 0.18-μm CMOS'. Together they form a unique fingerprint.

Cite this