A 46-nF/10-MΩ Range 114-aF/0.37-Ω Resolution Parasitic-and Temperature-Insensitive Reconfigurable RC-to-Digital Converter in 0.18-μm CMOS

Arup K. George; Wooyoon Shim; Jaeha Kung; Ji Hoon Kim; Minkyu Je; Junghyup Lee

doi:10.1109/TCSI.2021.3134010

A 46-nF/10-MΩ Range 114-aF/0.37-Ω Resolution Parasitic-and Temperature-Insensitive Reconfigurable RC-to-Digital Converter in 0.18-μm CMOS

Arup K. George, Wooyoon Shim, Jaeha Kung, Ji Hoon Kim, Minkyu Je, Junghyup Lee

Electronic and Electrical Engineering

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

8 Scopus citations

Abstract

This paper presents a 46 nF/10 M Ω-range, digital-intensive, reconfigurable RC-to-digital converter (R2CDC) that can readout multiple C and R sensors in a time-interleaved fashion. Ratio-metric conversion using swing-boosted period-modulation (SB-PM) front-end by the R2CDC results in 114 aFrms/0.37 Ω rms resolutions and a worst-case temperature-drift of 64.2 ppm/°C over-40 to 125°C. Femto-farad capacitances can be sensed with a relative code-deviation less than 0.16 % even when parasitics vary 30 times the baseline. Implemented in a 0.18 μ m standard CMOS process, the R2CDC consumes 140 μ A from a 1 V supply, occupying an active area of 0.175 μm 2.

Original language	English
Pages (from-to)	1171-1184
Number of pages	14
Journal	IEEE Transactions on Circuits and Systems I: Regular Papers
Volume	69
Issue number	3
DOIs	https://doi.org/10.1109/TCSI.2021.3134010
State	Published - 1 Mar 2022

Bibliographical note

Publisher Copyright:
© 2004-2012 IEEE.

Keywords

CMOS
Capacitance
Digital conversion
Parasiticc
Reconfigurable
Resistance
Sensor interface
temperature

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title = "A 46-nF/10-MΩ Range 114-aF/0.37-Ω Resolution Parasitic-and Temperature-Insensitive Reconfigurable RC-to-Digital Converter in 0.18-μm CMOS",

abstract = "This paper presents a 46 nF/10 M Ω-range, digital-intensive, reconfigurable RC-to-digital converter (R2CDC) that can readout multiple C and R sensors in a time-interleaved fashion. Ratio-metric conversion using swing-boosted period-modulation (SB-PM) front-end by the R2CDC results in 114 aFrms/0.37 Ω rms resolutions and a worst-case temperature-drift of 64.2 ppm/°C over-40 to 125°C. Femto-farad capacitances can be sensed with a relative code-deviation less than 0.16 % even when parasitics vary 30 times the baseline. Implemented in a 0.18 μ m standard CMOS process, the R2CDC consumes 140 μ A from a 1 V supply, occupying an active area of 0.175 μm 2.",

keywords = "CMOS, Capacitance, Digital conversion, Parasiticc, Reconfigurable, Resistance, Sensor interface, temperature",

author = "George, {Arup K.} and Wooyoon Shim and Jaeha Kung and Kim, {Ji Hoon} and Minkyu Je and Junghyup Lee",

note = "Publisher Copyright: {\textcopyright} 2004-2012 IEEE.",

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AU - George, Arup K.

AU - Shim, Wooyoon

AU - Kung, Jaeha

AU - Kim, Ji Hoon

AU - Je, Minkyu

AU - Lee, Junghyup

PY - 2022/3/1

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N2 - This paper presents a 46 nF/10 M Ω-range, digital-intensive, reconfigurable RC-to-digital converter (R2CDC) that can readout multiple C and R sensors in a time-interleaved fashion. Ratio-metric conversion using swing-boosted period-modulation (SB-PM) front-end by the R2CDC results in 114 aFrms/0.37 Ω rms resolutions and a worst-case temperature-drift of 64.2 ppm/°C over-40 to 125°C. Femto-farad capacitances can be sensed with a relative code-deviation less than 0.16 % even when parasitics vary 30 times the baseline. Implemented in a 0.18 μ m standard CMOS process, the R2CDC consumes 140 μ A from a 1 V supply, occupying an active area of 0.175 μm 2.

AB - This paper presents a 46 nF/10 M Ω-range, digital-intensive, reconfigurable RC-to-digital converter (R2CDC) that can readout multiple C and R sensors in a time-interleaved fashion. Ratio-metric conversion using swing-boosted period-modulation (SB-PM) front-end by the R2CDC results in 114 aFrms/0.37 Ω rms resolutions and a worst-case temperature-drift of 64.2 ppm/°C over-40 to 125°C. Femto-farad capacitances can be sensed with a relative code-deviation less than 0.16 % even when parasitics vary 30 times the baseline. Implemented in a 0.18 μ m standard CMOS process, the R2CDC consumes 140 μ A from a 1 V supply, occupying an active area of 0.175 μm 2.

KW - CMOS

KW - Capacitance

KW - Digital conversion

KW - Parasiticc

KW - Reconfigurable

KW - Resistance

KW - Sensor interface

KW - temperature

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A 46-nF/10-MΩ Range 114-aF/0.37-Ω Resolution Parasitic-and Temperature-Insensitive Reconfigurable RC-to-Digital Converter in 0.18-μm CMOS

Abstract

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Keywords

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