A Charge Balancing 1450 um2PNP-Based Thermal Sensor for Dense Thermal Monitoring

Ori Bass; Joseph Shor

doi:10.1109/tcsii.2020.2999494

A Charge Balancing 1450 um²PNP-Based Thermal Sensor for Dense Thermal Monitoring

Ori Bass, Joseph Shor

Bar-Ilan University - The Alexander Kofkin Faculty of Engineering

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

5 Scopus citations

Abstract

Thermal sensors are used in CPU's to detect hot spots and determine voltage levels. Since thermal gradients can be instruction dependent, there can be as many as 40 sensors/chip, which requires them to be compact. The industry standard for thermal sensors is the bandgap based PNP BJT sensor, because of its predictable and well-known physics. In this brief, a 1450 $\mu {\mathrm{ m}}^{2}$ charge-sharing BJT-based thermal sensor, with a 50 $\mu {\mathrm{ m}}^{2}$ sensing element, in 65nm is described. After a 1-point trim, the sensor exhibits a peak-to-peak accuracy of -2/+4°C over a 150°C range. After a 2-point trim, this becomes -2.5/+1.5°C over the same range. It also achieves a resolution of 0.22°C in an $821~\mu \text{s}$ conversion time. These specifications, as well as the small area, make the sensor attractive for dense CPU thermal monitoring.

Original language	English
Article number	9106352
Pages (from-to)	2963-2967
Number of pages	5
Journal	IEEE Transactions on Circuits and Systems II: Express Briefs
Volume	67
Issue number	12
DOIs	https://doi.org/10.1109/tcsii.2020.2999494
State	Published - Dec 2020

Bibliographical note

Publisher Copyright:
© 2004-2012 IEEE.

Funding

Manuscript received March 19, 2020; revised May 14, 2020; accepted May 29, 2020. Date of publication June 2, 2020; date of current version November 24, 2020. This work was supported by the Israel Innovation Authority. This brief was recommended by Associate Editor J. Goes. (Corresponding author: Joseph Shor.) The authors are with the Faculty of Engineering, Bar-Ilan University, Ramat Gan 52900, Israel (e-mail: [email protected]).

Funders	Funder number
Israel Innovation Authority

Keywords

Bandgap reference
CMOS
sigma-delta thermal sensor

Access to Document

10.1109/tcsii.2020.2999494

Cite this

@article{93aa221a078f4206bb1b3d52de167a23,

title = "A Charge Balancing 1450 um2PNP-Based Thermal Sensor for Dense Thermal Monitoring",

abstract = "Thermal sensors are used in CPU's to detect hot spots and determine voltage levels. Since thermal gradients can be instruction dependent, there can be as many as 40 sensors/chip, which requires them to be compact. The industry standard for thermal sensors is the bandgap based PNP BJT sensor, because of its predictable and well-known physics. In this brief, a 1450 $\mu {\mathrm{ m}}^{2}$ charge-sharing BJT-based thermal sensor, with a 50 $\mu {\mathrm{ m}}^{2}$ sensing element, in 65nm is described. After a 1-point trim, the sensor exhibits a peak-to-peak accuracy of -2/+4°C over a 150°C range. After a 2-point trim, this becomes -2.5/+1.5°C over the same range. It also achieves a resolution of 0.22°C in an $821~\mu \text{s}$ conversion time. These specifications, as well as the small area, make the sensor attractive for dense CPU thermal monitoring.",

keywords = "Bandgap reference, CMOS, sigma-delta thermal sensor",

author = "Ori Bass and Joseph Shor",

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

year = "2020",

month = dec,

doi = "10.1109/tcsii.2020.2999494",

language = "אנגלית",

volume = "67",

pages = "2963--2967",

journal = "IEEE Transactions on Circuits and Systems II: Express Briefs",

issn = "1549-7747",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

number = "12",

}

TY - JOUR

T1 - A Charge Balancing 1450 um2PNP-Based Thermal Sensor for Dense Thermal Monitoring

AU - Bass, Ori

AU - Shor, Joseph

PY - 2020/12

Y1 - 2020/12

N2 - Thermal sensors are used in CPU's to detect hot spots and determine voltage levels. Since thermal gradients can be instruction dependent, there can be as many as 40 sensors/chip, which requires them to be compact. The industry standard for thermal sensors is the bandgap based PNP BJT sensor, because of its predictable and well-known physics. In this brief, a 1450 $\mu {\mathrm{ m}}^{2}$ charge-sharing BJT-based thermal sensor, with a 50 $\mu {\mathrm{ m}}^{2}$ sensing element, in 65nm is described. After a 1-point trim, the sensor exhibits a peak-to-peak accuracy of -2/+4°C over a 150°C range. After a 2-point trim, this becomes -2.5/+1.5°C over the same range. It also achieves a resolution of 0.22°C in an $821~\mu \text{s}$ conversion time. These specifications, as well as the small area, make the sensor attractive for dense CPU thermal monitoring.

AB - Thermal sensors are used in CPU's to detect hot spots and determine voltage levels. Since thermal gradients can be instruction dependent, there can be as many as 40 sensors/chip, which requires them to be compact. The industry standard for thermal sensors is the bandgap based PNP BJT sensor, because of its predictable and well-known physics. In this brief, a 1450 $\mu {\mathrm{ m}}^{2}$ charge-sharing BJT-based thermal sensor, with a 50 $\mu {\mathrm{ m}}^{2}$ sensing element, in 65nm is described. After a 1-point trim, the sensor exhibits a peak-to-peak accuracy of -2/+4°C over a 150°C range. After a 2-point trim, this becomes -2.5/+1.5°C over the same range. It also achieves a resolution of 0.22°C in an $821~\mu \text{s}$ conversion time. These specifications, as well as the small area, make the sensor attractive for dense CPU thermal monitoring.

KW - Bandgap reference

KW - CMOS

KW - sigma-delta thermal sensor

UR - http://www.scopus.com/inward/record.url?scp=85097065772&partnerID=8YFLogxK

U2 - 10.1109/tcsii.2020.2999494

DO - 10.1109/tcsii.2020.2999494

M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???

AN - SCOPUS:85097065772

SN - 1549-7747

VL - 67

SP - 2963

EP - 2967

JO - IEEE Transactions on Circuits and Systems II: Express Briefs

JF - IEEE Transactions on Circuits and Systems II: Express Briefs

IS - 12

M1 - 9106352

ER -