A ±4A high-side current sensor with 25V input CM range and 0.9% gain error from -40°C to 85°C using an analog temperature compensation technique

Long Xu; Johan H. Huijsing; Kofi A.A. Makinwa

doi:10.1109/ISSCC.2018.8310315

A ±4A high-side current sensor with 25V input CM range and 0.9% gain error from -40°C to 85°C using an analog temperature compensation technique

Long Xu, Johan H. Huijsing, Kofi A.A. Makinwa

Research output: Chapter in Book/Conference proceedings/Edited volume › Conference contribution › Scientific › peer-review

9 Citations (Scopus)

48 Downloads (Pure)

Abstract

This paper presents a fully integrated ±4A current sensor that supports a 25V input common-mode voltage range (CMVR) while operating from a single 1.5V supply. It consists of an on-chip metal shunt, a beyond-the-rails ADC [1] and a temperature-dependent voltage reference. The beyond-the-rails ADC facilitates high-side current sensing without the need for external resistive dividers or level shifters, thus reducing power consumption and system complexity. To compensate for the shunt's temperature dependence, the ADC employs a proportional-to-absolute-temperature (PTAT) reference voltage. Compared to digital temperature compensation schemes [2,3], this analog scheme eliminates the need for a temperature sensor, a band-gap voltage reference and calibration logic. As a result, the current sensor draws only 10.9μA and is 10x more energy efficient than [2]. Over a ±4A range, and after a one-point trim, the sensor exhibits a 0.9% (max) gain error from -40°C to 85°C and a 0.05% gain error at room temperature. The former is comparable with that of other fully-integrated current sensors [2-4], while the latter represents the state-of-the-art.

Original language	English
Title of host publication	2018 IEEE International Solid-State Circuits Conference, ISSCC 2018
Subtitle of host publication	Digest of Technical Papers
Editors	L.C. Fujino
Place of Publication	Lewiston, USA
Publisher	IEEE
Pages	324-326
Number of pages	3
Volume	61
ISBN (Electronic)	978-1-5090-4940-0
ISBN (Print)	978-1-5386-2227-8
DOIs	https://doi.org/10.1109/ISSCC.2018.8310315
Publication status	Published - 2018
Event	65th IEEE International Solid-State Circuits Conference, ISSCC 2018 - San Francisco, United States Duration: 11 Feb 2018 → 15 Feb 2018

Conference

Conference	65th IEEE International Solid-State Circuits Conference, ISSCC 2018
Country/Territory	United States
City	San Francisco
Period	11/02/18 → 15/02/18

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.

Keywords

Temperature sensors
Temperature distribution
Capacitors
Temperature dependence
Temperature measurement
Metals

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10.1109/ISSCC.2018.8310315

08310315Final published version, 773 KB

Cite this

Xu, L., Huijsing, J. H., & Makinwa, K. A. A. (2018). A ±4A high-side current sensor with 25V input CM range and 0.9% gain error from -40°C to 85°C using an analog temperature compensation technique. In L. C. Fujino (Ed.), 2018 IEEE International Solid-State Circuits Conference, ISSCC 2018: Digest of Technical Papers (Vol. 61, pp. 324-326). IEEE. https://doi.org/10.1109/ISSCC.2018.8310315

Xu, Long ; Huijsing, Johan H. ; Makinwa, Kofi A.A. / A ±4A high-side current sensor with 25V input CM range and 0.9% gain error from -40°C to 85°C using an analog temperature compensation technique. 2018 IEEE International Solid-State Circuits Conference, ISSCC 2018: Digest of Technical Papers. editor / L.C. Fujino. Vol. 61 Lewiston, USA : IEEE, 2018. pp. 324-326

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title = "A ±4A high-side current sensor with 25V input CM range and 0.9% gain error from -40°C to 85°C using an analog temperature compensation technique",

abstract = "This paper presents a fully integrated ±4A current sensor that supports a 25V input common-mode voltage range (CMVR) while operating from a single 1.5V supply. It consists of an on-chip metal shunt, a beyond-the-rails ADC [1] and a temperature-dependent voltage reference. The beyond-the-rails ADC facilitates high-side current sensing without the need for external resistive dividers or level shifters, thus reducing power consumption and system complexity. To compensate for the shunt's temperature dependence, the ADC employs a proportional-to-absolute-temperature (PTAT) reference voltage. Compared to digital temperature compensation schemes [2,3], this analog scheme eliminates the need for a temperature sensor, a band-gap voltage reference and calibration logic. As a result, the current sensor draws only 10.9μA and is 10x more energy efficient than [2]. Over a ±4A range, and after a one-point trim, the sensor exhibits a 0.9% (max) gain error from -40°C to 85°C and a 0.05% gain error at room temperature. The former is comparable with that of other fully-integrated current sensors [2-4], while the latter represents the state-of-the-art.",

keywords = "Temperature sensors, Temperature distribution, Capacitors , Temperature dependence, Temperature measurement, Metals",

author = "Long Xu and Huijsing, {Johan H.} and Makinwa, {Kofi A.A.}",

note = "Green Open Access added to TU Delft Institutional Repository {\textquoteleft}You share, we take care!{\textquoteright} – 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. ; 65th IEEE International Solid-State Circuits Conference, ISSCC 2018 ; Conference date: 11-02-2018 Through 15-02-2018",

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doi = "10.1109/ISSCC.2018.8310315",

language = "English",

isbn = "978-1-5386-2227-8 ",

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Xu, L, Huijsing, JH & Makinwa, KAA 2018, A ±4A high-side current sensor with 25V input CM range and 0.9% gain error from -40°C to 85°C using an analog temperature compensation technique. in LC Fujino (ed.), 2018 IEEE International Solid-State Circuits Conference, ISSCC 2018: Digest of Technical Papers. vol. 61, IEEE, Lewiston, USA, pp. 324-326, 65th IEEE International Solid-State Circuits Conference, ISSCC 2018, San Francisco, United States, 11/02/18. https://doi.org/10.1109/ISSCC.2018.8310315

A ±4A high-side current sensor with 25V input CM range and 0.9% gain error from -40°C to 85°C using an analog temperature compensation technique. / Xu, Long; Huijsing, Johan H.; Makinwa, Kofi A.A.
2018 IEEE International Solid-State Circuits Conference, ISSCC 2018: Digest of Technical Papers. ed. / L.C. Fujino. Vol. 61 Lewiston, USA: IEEE, 2018. p. 324-326.

Research output: Chapter in Book/Conference proceedings/Edited volume › Conference contribution › Scientific › peer-review

TY - GEN

T1 - A ±4A high-side current sensor with 25V input CM range and 0.9% gain error from -40°C to 85°C using an analog temperature compensation technique

AU - Xu, Long

AU - Huijsing, Johan H.

AU - Makinwa, Kofi A.A.

N1 - 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.

PY - 2018

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N2 - This paper presents a fully integrated ±4A current sensor that supports a 25V input common-mode voltage range (CMVR) while operating from a single 1.5V supply. It consists of an on-chip metal shunt, a beyond-the-rails ADC [1] and a temperature-dependent voltage reference. The beyond-the-rails ADC facilitates high-side current sensing without the need for external resistive dividers or level shifters, thus reducing power consumption and system complexity. To compensate for the shunt's temperature dependence, the ADC employs a proportional-to-absolute-temperature (PTAT) reference voltage. Compared to digital temperature compensation schemes [2,3], this analog scheme eliminates the need for a temperature sensor, a band-gap voltage reference and calibration logic. As a result, the current sensor draws only 10.9μA and is 10x more energy efficient than [2]. Over a ±4A range, and after a one-point trim, the sensor exhibits a 0.9% (max) gain error from -40°C to 85°C and a 0.05% gain error at room temperature. The former is comparable with that of other fully-integrated current sensors [2-4], while the latter represents the state-of-the-art.

AB - This paper presents a fully integrated ±4A current sensor that supports a 25V input common-mode voltage range (CMVR) while operating from a single 1.5V supply. It consists of an on-chip metal shunt, a beyond-the-rails ADC [1] and a temperature-dependent voltage reference. The beyond-the-rails ADC facilitates high-side current sensing without the need for external resistive dividers or level shifters, thus reducing power consumption and system complexity. To compensate for the shunt's temperature dependence, the ADC employs a proportional-to-absolute-temperature (PTAT) reference voltage. Compared to digital temperature compensation schemes [2,3], this analog scheme eliminates the need for a temperature sensor, a band-gap voltage reference and calibration logic. As a result, the current sensor draws only 10.9μA and is 10x more energy efficient than [2]. Over a ±4A range, and after a one-point trim, the sensor exhibits a 0.9% (max) gain error from -40°C to 85°C and a 0.05% gain error at room temperature. The former is comparable with that of other fully-integrated current sensors [2-4], while the latter represents the state-of-the-art.

KW - Temperature sensors

KW - Temperature distribution

KW - Capacitors

KW - Temperature dependence

KW - Temperature measurement

KW - Metals

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SN - 978-1-5386-2227-8

VL - 61

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EP - 326

BT - 2018 IEEE International Solid-State Circuits Conference, ISSCC 2018

A2 - Fujino, L.C.

PB - IEEE

CY - Lewiston, USA

T2 - 65th IEEE International Solid-State Circuits Conference, ISSCC 2018

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ER -

Xu L, Huijsing JH , Makinwa KAA. A ±4A high-side current sensor with 25V input CM range and 0.9% gain error from -40°C to 85°C using an analog temperature compensation technique. In Fujino LC, editor, 2018 IEEE International Solid-State Circuits Conference, ISSCC 2018: Digest of Technical Papers. Vol. 61. Lewiston, USA: IEEE. 2018. p. 324-326 doi: 10.1109/ISSCC.2018.8310315

A ±4A high-side current sensor with 25V input CM range and 0.9% gain error from -40°C to 85°C using an analog temperature compensation technique

Abstract

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Bibliographical note

Keywords

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