A CMOS Dual- RC Frequency Reference With ±200-ppm Inaccuracy From -45 °C to 85 °C

Journal article (2018)

Authors

C. Gürleyük Electronic Instrumentation - EEMCS
L. Pedala' Electronic Instrumentation - EEMCS
S. Pan Electronic Instrumentation - EEMCS
K.A.A. Makinwa Microelectronics
F. Sebastiano (OLD)Applied Quantum Architectures , QuTech Advanced Research Centre
Research Group
Electronic Instrumentation (EEMCS) (TU Delft)
Copyright: © 2018 C. Gürleyük, L. Pedala', S. Pan, K.A.A. Makinwa, F. Sebastiano
DOI: https://doi.org/10.1109/JSSC.2018.2869083
CMOS Digitally controlled oscillator (DCO) Digital frequency-locked loop (FLL) Integrated frequency reference RC-based
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Published Date

2018

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Electronic Instrumentation

Abstract

This paper presents a 7-MHz CMOS RC frequency reference. It consists of a frequency-locked loop in which the output frequency of a digitally controlled oscillator (DCO) is locked to the combined phase shifts of two independent RC (Wien bridge) filters, each employing resistors with complementary temperature coefficients. The filters are driven by the DCO's output frequency and the resulting phase shifts are digitized by high-resolution phase-to-digital converters. Their outputs are then combined in the digital domain to realize a temperature-independent frequency error signal. This digitally assisted temperature compensation scheme achieves an inaccuracy of ±200 ppm from -45 °C to 85 °C after a two-point trim. The frequency reference draws 430 μA from a 1.8-V supply, while achieving a supply sensitivity of 0.18%/V and a 330-ppb Allan deviation floor in 3 s of measurement time.

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