Print Email Facebook Twitter A 0.9-V 28-MHz Highly Digital CMOS Dual-RC Frequency Reference With ±200 ppm Inaccuracy From -40 °C to 85 °C Title A 0.9-V 28-MHz Highly Digital CMOS Dual-RC Frequency Reference With ±200 ppm Inaccuracy From -40 °C to 85 °C Author Choi, Woojun (ETH Zürich) Angevare, J. (TU Delft Electronic Instrumentation) Park, Injun (Samsung Electronics Company Ltd.) Makinwa, K.A.A. (TU Delft Microelectronics) Chae, Youngcheol (Yonsei University) Department Microelectronics Date 2022 Abstract This article presents an energy-efficient dual- RC frequency reference intended for wireless sensor nodes. It consists of a digital frequency-locked loop (FLL) in which the frequency of a digitally controlled oscillator (DCO) is locked to a temperature-independent phase shift derived from two different RC poly-phase filters (PPFs). Phase shifts with complementary temperature coefficients (TCs) are generated by using PPFs made from different resistor types (p-poly and silicided p-poly). The phase shift of each filter is determined by a zero-crossing (ZC) detector and then digitized by a digital phase-domain ΔΣ modulator ( Φ - ΔΣM ). The results are then combined in the digital domain via fixed polynomials to produce a temperature-independent phase shift. This highly digital architecture enables the use of a sub-1-V supply voltage and enhances energy and area efficiency. The 28-MHz frequency reference occupies 0.06 mm2 in a 65-nm CMOS process. It achieves a period jitter of 7 ps ( 1σ ) and draws 142 μW from a 0.9-V supply, which corresponds to an energy consumption of 5 pJ/cycle. Furthermore, it achieves ±200 ppm inaccuracy from −40∘C to 85 ∘C after a two-point trim. Subject CMOS frequency referencedigital frequency-locked loop (FLL)digital phase-domain ΔΣ modulator (ϕ-ΔΣM)digitally assistedRC poly-phase filter (PPF)temperature compensationtrimmingwireless sensor nodezero-crossing (ZC) detector. To reference this document use: http://resolver.tudelft.nl/uuid:23b335cf-8f35-4405-b94c-9d037f6eccd6 DOI https://doi.org/10.1109/JSSC.2021.3135939 Embargo date 2023-03-01 ISSN 0018-9200 Source IEEE Journal of Solid State Circuits, 57 (8), 2418-2428 Bibliographical note Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Part of collection Institutional Repository Document type journal article Rights © 2022 Woojun Choi, J. Angevare, Injun Park, K.A.A. Makinwa, Youngcheol Chae Files PDF A_0.9_V_28_MHz_Highly_Dig ... 5_C_1_.pdf 5.99 MB Close viewer /islandora/object/uuid:23b335cf-8f35-4405-b94c-9d037f6eccd6/datastream/OBJ/view