A 1-μW/MHz RC Oscillator With Three-Point Trimmed 2.1-ppm/°C and Single-Point Trimmed 8.7-ppm/°C Stability From40 °C to 95 °C

Kyu Sang Park; Amr Khashaba; Ahmed Abdelrahman; Yongxin Li; Tianyu Wang; Ruhao Xia; Nilanjan Pal; Pavan Kumar Hanumolu

doi:10.1109/JSSC.2022.3227191

A 1-μW/MHz RC Oscillator With Three-Point Trimmed 2.1-ppm/°C and Single-Point Trimmed 8.7-ppm/°C Stability From40 °C to 95 °C

Kyu Sang Park, Amr Khashaba, Ahmed Abdelrahman, Yongxin Li, Tianyu Wang, Ruhao Xia, Nilanjan Pal, Pavan Kumar Hanumolu

Research output: Contribution to journal › Article › peer-review

Abstract

This article presents techniques to improve the frequency stability of RC oscillators by performing first- and second-order temperature compensation without needing resistors with opposite temperature coefficients (TCs). Using the proposed three-point digital trim, a prototype 100-MHz frequency-locked loop (FLL)-based RC oscillator fabricated in a 65-nm CMOS process achieves an inaccuracy of ±140 ppm over -40 °C to 95 °C, 83-ppm/V voltage sensitivity, 1.3-ppm Allan deviation floor, and 1- μ W /MHz power efficiency. When only a single-point trim is performed using a multiple linear regression model leveraging the strong correlation between three switched resistors, the frequency inaccuracy is ±587 ppm.

Original language	English (US)
Pages (from-to)	2064-2074
Number of pages	11
Journal	IEEE Journal of Solid-State Circuits
Volume	58
Issue number	7
DOIs	https://doi.org/10.1109/JSSC.2022.3227191
State	Published - Jul 1 2023

Keywords

Delta-sigma modulator
RC oscillator
pulse density modulation
ring voltage-controlled oscillator (VCO)
switched capacitor
switched resistor
temperature compensation

ASJC Scopus subject areas

Electrical and Electronic Engineering

Online availability

10.1109/JSSC.2022.3227191

Library availability

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title = "A 1-μW/MHz RC Oscillator With Three-Point Trimmed 2.1-ppm/°C and Single-Point Trimmed 8.7-ppm/°C Stability From40 °C to 95 °C",

abstract = "This article presents techniques to improve the frequency stability of RC oscillators by performing first- and second-order temperature compensation without needing resistors with opposite temperature coefficients (TCs). Using the proposed three-point digital trim, a prototype 100-MHz frequency-locked loop (FLL)-based RC oscillator fabricated in a 65-nm CMOS process achieves an inaccuracy of ±140 ppm over -40 °C to 95 °C, 83-ppm/V voltage sensitivity, 1.3-ppm Allan deviation floor, and 1- μ W /MHz power efficiency. When only a single-point trim is performed using a multiple linear regression model leveraging the strong correlation between three switched resistors, the frequency inaccuracy is ±587 ppm.",

keywords = "Delta-sigma modulator, RC oscillator, pulse density modulation, ring voltage-controlled oscillator (VCO), switched capacitor, switched resistor, temperature compensation",

author = "Park, {Kyu Sang} and Amr Khashaba and Ahmed Abdelrahman and Yongxin Li and Tianyu Wang and Ruhao Xia and Nilanjan Pal and Hanumolu, {Pavan Kumar}",

note = "Funding Information: This work was supported by Semiconductor Research Corporation (SRC) under GRC Task 2810.036. Publisher Copyright: Author Funding Information: This work was supported by Semiconductor Research Corporation (SRC) under GRC Task 2810.036. Publisher Copyright: {\textcopyright} 1966-2012 IEEE.",

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doi = "10.1109/JSSC.2022.3227191",

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AU - Park, Kyu Sang

AU - Khashaba, Amr

AU - Abdelrahman, Ahmed

AU - Li, Yongxin

AU - Wang, Tianyu

AU - Xia, Ruhao

AU - Pal, Nilanjan

AU - Hanumolu, Pavan Kumar

N1 - Funding Information: This work was supported by Semiconductor Research Corporation (SRC) under GRC Task 2810.036. Publisher Copyright: Author Funding Information: This work was supported by Semiconductor Research Corporation (SRC) under GRC Task 2810.036. Publisher Copyright: © 1966-2012 IEEE.

PY - 2023/7/1

Y1 - 2023/7/1

N2 - This article presents techniques to improve the frequency stability of RC oscillators by performing first- and second-order temperature compensation without needing resistors with opposite temperature coefficients (TCs). Using the proposed three-point digital trim, a prototype 100-MHz frequency-locked loop (FLL)-based RC oscillator fabricated in a 65-nm CMOS process achieves an inaccuracy of ±140 ppm over -40 °C to 95 °C, 83-ppm/V voltage sensitivity, 1.3-ppm Allan deviation floor, and 1- μ W /MHz power efficiency. When only a single-point trim is performed using a multiple linear regression model leveraging the strong correlation between three switched resistors, the frequency inaccuracy is ±587 ppm.

AB - This article presents techniques to improve the frequency stability of RC oscillators by performing first- and second-order temperature compensation without needing resistors with opposite temperature coefficients (TCs). Using the proposed three-point digital trim, a prototype 100-MHz frequency-locked loop (FLL)-based RC oscillator fabricated in a 65-nm CMOS process achieves an inaccuracy of ±140 ppm over -40 °C to 95 °C, 83-ppm/V voltage sensitivity, 1.3-ppm Allan deviation floor, and 1- μ W /MHz power efficiency. When only a single-point trim is performed using a multiple linear regression model leveraging the strong correlation between three switched resistors, the frequency inaccuracy is ±587 ppm.

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KW - RC oscillator

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A 1-μW/MHz RC Oscillator With Three-Point Trimmed 2.1-ppm/°C and Single-Point Trimmed 8.7-ppm/°C Stability From40 °C to 95 °C

Abstract

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