A CMOS Dual-RC frequency reference with ±250ppm inaccuracy from −45°C to 85°C

To comply with wired communication standards such as USB, SATA and PCI/PCI-E, systems-on-chip require frequency references with better than 300ppm accuracy. LC-based references achieve 100ppm accuracy [1], but suffer from high power consumption (~20mW). Thermal diffusivity (TD) references require le...

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Bibliographic Details
Published in2018 IEEE International Solid - State Circuits Conference - (ISSCC) pp. 54 - 56
Main Authors Gurleyuk, Cagri, Pedala, Lorenzo, Sebastiano, Fabio, Makinwa, Kofi A. A.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.02.2018
Subjects
Circuit stability
Frequency locked loops
Jitter
Oscillators
Resistors
Temperature measurement
Thermal stability
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Summary:To comply with wired communication standards such as USB, SATA and PCI/PCI-E, systems-on-chip require frequency references with better than 300ppm accuracy. LC-based references achieve 100ppm accuracy [1], but suffer from high power consumption (~20mW). Thermal diffusivity (TD) references require less power (~2mW), at the expense of less accuracy (1000ppm) [2]. RC-based references offer the lowest power consumption, but their accuracy is typically limited to ~0.1% [3]. In RC relaxation oscillators, comparator offset and delay are the major sources of inaccuracy [4,5]. References based on frequency-locked loops (FLLs) circumvent these by locking an oscillator's frequency to the time-constant of an RC filter, but their accuracy is then limited by the nonlinear temperature dependency of on-chip resistors [3,6].
ISSN:2376-8606
DOI:10.1109/ISSCC.2018.8310180