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J. Semicond. > 2021, Volume 42?>?Issue 3?> 032401

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A 1.2 V, 3.1% 3σ-accuracy thermal sensor analog front-end circuit in 12 nm CMOS process

Liqiong Yang1, 2, , Linfeng Wang3, Junhua Xiao1, 2, Longbing Zhang1, 2 and Jian Wang1, 2

+ Author Affiliations

 Corresponding author: Liqiong Yang, yangliqiong@ict.ac.cn

DOI: 10.1088/1674-4926/42/3/032401

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Abstract: This paper presents a 1.2 V high accuracy thermal sensor analog front-end circuit with 7 probes placed around the microprocessor chip. This analog front-end consists of a BGR (bandgap reference), a DEM (dynamic element matching) control, and probes. The BGR generates the voltages linear changed with temperature, which are followed by the data read out circuits. The superior accuracy of the BGR’s output voltage is a key factor for sensors fabricated via the FinFET digital process. Here, a 4-stage folded current bias structure is proposed, to increase DC accuracy and confer immunity against FinFET process variation due to limited device length and low current bias. At the same time, DEM is also adopted, so as to filter out current branch mismatches. Having been fabricated via a 12 nm FinFET CMOS process, 200 chips were tested. The measurement results demonstrate that these analog front-end circuits can work steadily below 1.2 V, and a less than 3.1% 3σ-accuracy level is achieved. Temperature stability is 0.088 mV/°C across a range from –40 to 130 °C.

Key words: CMOS FinFET process, microprocessor, thermal sensor, BGR, 4-stage folded



[1]
Horng J J, Liu S L, Kundu A, et al. A 0.7 V resistive sensor with temperature/voltage detection function in 16 nm FinFET technologies. IEEE Symposium on VLSI Technology and Circuits, 2014, 54
[2]
S?nmez U, Sebastiano F, Makinwa K A A. 1650 μm2 thermal-diffusivity sensor with inaccuracies down to ±0.75 °C in 40nm CMOS. IEEE International Solid-State Circuits Conference, 2016, 206
[3]
Bakker A, Huijsing J. High-accuracy CMOS smart temperature sensors. Boston: Kluwer Academic, 2000
[4]
Meijer G C M, Wang G, Fruett F. Temperature sensors and voltage references implemented in CMOS technology. IEEE Sens J, 2001, 1(3), 225 doi: 10.1109/JSEN.2001.954835
[5]
Wang G, Heidari A, Makinwa K A A. An accurate BJT-based CMOS temperature sensor with duty-cycle-modulated output. IEEE Trans Ind Electron, 2017, 64, 1572 doi: 10.1109/TIE.2016.2614273
[6]
Ramirez J L, Tiol J P, Deotti D, et al. Delta-sigma modulated output temperature sensor for 1V voltage supply. IEEE Latin American Symposium on Circuits & Systems, 2019, 249
[7]
Ivanov V, Brederlow R, Gerber J. An ultra low power bandgap operational at supply from 0.75 V. IEEE J Solid-State Circuits, 2012, 47(7), 1515 doi: 10.1109/JSSC.2012.2191192
[8]
Lee J M, Ji Y, Choi S, et al. A 29nW bandgap reference circuit. IEEE International Solid-State Circuits Conference, 2015, 100
[9]
Ji Y, Jeon C, Son H, et al. A 9.3nW all-in-one bandgap voltage and current reference circuit. IEEE International Solid-State Circuits Conference, 2017, 100
[10]
Kamath U, Cullen E, Yu T, et al. A 1-V bandgap reference in 7-nm FinFET with a programmable temperature coefficient and inaccuracy of ±0.2% from –45 °C to 125 °C. IEEE J Solid-State Circuits, 2019, 54(7), 1830 doi: 10.1109/JSSC.2019.2919134
[11]
Meijer G C M. Thermal sensor based on transistors. Sens Actuators, 1986, 10(1), 103 doi: 10.1016/0250-6874(86)80037-3
[12]
Pertijs M A P, Niederkorn A, Ma X, et al. A CMOS smart temperature sensor with a 3σ inaccuracy of ±0.5 °C from –50 °C to 120 °C. IEEE J Solid-State Circuits, 2005, 40(2), 454 doi: 10.1109/JSSC.2004.841013
[13]
Yin L X, Du G, Liu X Y. Impact of ambient temperature on the self-heating effects in FinFETs. J Semicond, 2018, 39(9), 094011 doi: 10.1088/1674-4926/39/9/094011
[14]
Bakker A, Thiele K, Huijsing J. A CMOS nested chopper instrumentation amplifier with 100nV offset. IEEE International Solid-State Circuits Conference, 2000, 156
Fig. 1.  Architecture of a typical thermal sensor.

Fig. 2.  Analog front-end and new folded current unit.

Fig. 3.  (Color online) Simulation results for different numbers of folded stage used in BGR. (a) DC mismatch biased at the same current. (b) Worst variation of VBEN under 1.2 and 0.95 V, as obtained from a Monte Carlo simulation of 1000 runs.

Fig. 4.  (Color online) Simulation results for flicker noise for normal CMOS and 4-stage folded structures.

Fig. 5.  (Color online) Die photo of the test chip.

Fig. 6.  (Color online) Measured variation results for 2-VBE at room temperature.

Fig. 7.  (Color online) 3σ accuracy statistics for 200 chips, VBEP, VBEN, and VREF.

Fig. 8.  (Color online) Temperature linear results for VREF (calculated by the measured results of the variations of 2-VBE).

Table 1.   Comparison table.

ParameterRef. [7]Ref. [8]Ref. [9]Ref. [10]This work
Technology130 nm CMOS350 nm CMOS180 nm CMOS7 nm CMOS12 nm CMOS
Supply (V)0.751.21.21.3751.2
Temprange (°C)–20 to 85–10 to 1100 to 110–45 to 125–40 to 130
3σ (%)30.61.290.6<3.1
TC (ppm)4012.7526688
Of chips90000101077/200
BJT onlyYesNoNoYesNo
TypeSwitchCapDCDCDCDC
Power (nW)17028.79.39.74 × 1054.96 × 104
Area (mm2)0.070.480.0550.0780.0124
DownLoad: CSV
[1]
Horng J J, Liu S L, Kundu A, et al. A 0.7 V resistive sensor with temperature/voltage detection function in 16 nm FinFET technologies. IEEE Symposium on VLSI Technology and Circuits, 2014, 54
[2]
S?nmez U, Sebastiano F, Makinwa K A A. 1650 μm2 thermal-diffusivity sensor with inaccuracies down to ±0.75 °C in 40nm CMOS. IEEE International Solid-State Circuits Conference, 2016, 206
[3]
Bakker A, Huijsing J. High-accuracy CMOS smart temperature sensors. Boston: Kluwer Academic, 2000
[4]
Meijer G C M, Wang G, Fruett F. Temperature sensors and voltage references implemented in CMOS technology. IEEE Sens J, 2001, 1(3), 225 doi: 10.1109/JSEN.2001.954835
[5]
Wang G, Heidari A, Makinwa K A A. An accurate BJT-based CMOS temperature sensor with duty-cycle-modulated output. IEEE Trans Ind Electron, 2017, 64, 1572 doi: 10.1109/TIE.2016.2614273
[6]
Ramirez J L, Tiol J P, Deotti D, et al. Delta-sigma modulated output temperature sensor for 1V voltage supply. IEEE Latin American Symposium on Circuits & Systems, 2019, 249
[7]
Ivanov V, Brederlow R, Gerber J. An ultra low power bandgap operational at supply from 0.75 V. IEEE J Solid-State Circuits, 2012, 47(7), 1515 doi: 10.1109/JSSC.2012.2191192
[8]
Lee J M, Ji Y, Choi S, et al. A 29nW bandgap reference circuit. IEEE International Solid-State Circuits Conference, 2015, 100
[9]
Ji Y, Jeon C, Son H, et al. A 9.3nW all-in-one bandgap voltage and current reference circuit. IEEE International Solid-State Circuits Conference, 2017, 100
[10]
Kamath U, Cullen E, Yu T, et al. A 1-V bandgap reference in 7-nm FinFET with a programmable temperature coefficient and inaccuracy of ±0.2% from –45 °C to 125 °C. IEEE J Solid-State Circuits, 2019, 54(7), 1830 doi: 10.1109/JSSC.2019.2919134
[11]
Meijer G C M. Thermal sensor based on transistors. Sens Actuators, 1986, 10(1), 103 doi: 10.1016/0250-6874(86)80037-3
[12]
Pertijs M A P, Niederkorn A, Ma X, et al. A CMOS smart temperature sensor with a 3σ inaccuracy of ±0.5 °C from –50 °C to 120 °C. IEEE J Solid-State Circuits, 2005, 40(2), 454 doi: 10.1109/JSSC.2004.841013
[13]
Yin L X, Du G, Liu X Y. Impact of ambient temperature on the self-heating effects in FinFETs. J Semicond, 2018, 39(9), 094011 doi: 10.1088/1674-4926/39/9/094011
[14]
Bakker A, Thiele K, Huijsing J. A CMOS nested chopper instrumentation amplifier with 100nV offset. IEEE International Solid-State Circuits Conference, 2000, 156

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    History

    Received: 23 July 2020 Revised: 31 August 2020 Online: Accepted Manuscript: 20 October 2020Uncorrected proof: 23 October 2020Published: 10 March 2021

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      Liqiong Yang, Linfeng Wang, Junhua Xiao, Longbing Zhang, Jian Wang. A 1.2 V, 3.1% 3σ-accuracy thermal sensor analog front-end circuit in 12 nm CMOS process[J]. Journal of Semiconductors, 2021, 42(3): 032401. doi: 10.1088/1674-4926/42/3/032401 ****L Q Yang, L F Wang, J H Xiao, L B Zhang, J Wang, A 1.2 V, 3.1% 3σ-accuracy thermal sensor analog front-end circuit in 12 nm CMOS process[J]. J. Semicond., 2021, 42(3): 032401. doi: 10.1088/1674-4926/42/3/032401.
      Citation:
      Liqiong Yang, Linfeng Wang, Junhua Xiao, Longbing Zhang, Jian Wang. A 1.2 V, 3.1% 3σ-accuracy thermal sensor analog front-end circuit in 12 nm CMOS process[J]. Journal of Semiconductors, 2021, 42(3): 032401. doi: 10.1088/1674-4926/42/3/032401 ****
      L Q Yang, L F Wang, J H Xiao, L B Zhang, J Wang, A 1.2 V, 3.1% 3σ-accuracy thermal sensor analog front-end circuit in 12 nm CMOS process[J]. J. Semicond., 2021, 42(3): 032401. doi: 10.1088/1674-4926/42/3/032401.

      A 1.2 V, 3.1% 3σ-accuracy thermal sensor analog front-end circuit in 12 nm CMOS process

      DOI: 10.1088/1674-4926/42/3/032401
      • 1.

        State Key Laboratory of Computer Architecture, Institute of Computing Technology, Chinese Academy of Sciences, Beijing 100190, China

      • 2.

        University of Chinese Academy of Sciences, Beijing 100049, China

      • 3.

        Loongson Technology Corporation Limited, Beijing 100095, China

      More Information
      • Liqiong Yang：got her B.S., M.S. degrees from Beijing Institute of Technology in 2005 and 2007, respectively. Then she joined Institute of Computing Technology, Chinese Academy of Sciences. Now she is a Senior Engineer in State Key Laboratory of Computer Architecture and working toward the Ph.D. degree in University of Chinese Academy of Sciences. Her research interests include computer structure, low power synchronized clock system, high speed SerDes and sensors on chip
      • Corresponding author: yangliqiong@ict.ac.cn
      • Received Date: 2020-07-23
      • Revised Date: 2020-08-31
      • Published Date: 2021-03-10

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