5.4 A Hybrid Thermal-Diffusivity/Resistor-Based Temperature Sensor with a Self-Calibrated Inaccuracy of ±0.25° C(3 Σ) from -55°C to 125°C

Pan, Sining; Angevare, Jan A.; Makinwa, Kofi A. A.

doi:10.1109/isscc42613.2021.9366032

Cited by 10 publications

(9 citation statements)

References 6 publications

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“…, respectively, where R p (T 0 ) and R n (T 0 ) are their resistances at a reference temperature T 0 ; TC p1 and TC n1 are their first-order temperature coefficients; TC p2 and TC n2 are their second-order temperature coefficients. T is the relative temperature from [3].…”

Section: Thermal Sensing Principlementioning

confidence: 99%

“…Furthermore, they should be compatible with the digital voltage supply level, which scales down with modern technology nodes [2]. In previously published resistor-based temperature sensors [3,4], the complementary thermal dependency of the on-chip silicided and the non-silicided resistors are exploited and the resistors' thermal coefficient is converted into a temperature dependent voltage, current or time delay, which is quantised by the following ADCs, for example, a continuous time delta-sigma modulator, or, a Time-to-Digital Converter (TDC). To reduce the power supply level and the power supply sensitivity, this paper presents a temperature sensor with the following features.…”

Section: Introductionmentioning

confidence: 99%

“…b 3 σ accuracy/temperature range, in reference to[6]. * Post-layout simulation results while[2][3][4] are measurement results.in Table1. The advantages of the proposed temperature are its lower supply voltage, supply voltage sensitivity and Resolution FOM.…”

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confidence: 99%

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A 0.7 V R‐2R SAR ladder‐based temperature sensor with less supply sensitivity

Xie

Wang

2022

Electronics Letters

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A 0.7 V, R-2R SAR ladder-based temperature sensor with less supply sensitivity is presented, intended for Very Large-Scale Integration thermal management. Its silicided and non-silicided resistors in the R-2R ladders serve as both thermal sensing and quantization elements. The only active component it requires is the comparator, which is compatible with low power supply voltage. The post-layout simulation results show it has an inaccuracy of 0.5°C between -40°C and 125°C for TT, FF and SS corners.

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Section: Thermal Sensing Principlementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A 0.7 V R‐2R SAR ladder‐based temperature sensor with less supply sensitivity

Xie

Wang

2022

Electronics Letters

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“…Data converters based on the ΔΣ modulation are widely used to digitize smallamplitude, low-frequency signals generated by sensors [3,5,6,12]. One of the main requirements in these applications is a large dynamic range.…”

Section: Introductionmentioning

confidence: 99%

Decimation of Delta-Sigma-Modulated Signals Using a Low-Cost Microcontroller

Fishta

Fiori

2021

Circuits Syst Signal Process

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Abstract$$\varDelta \varSigma $$ Δ Σ analog-to-digital converters (ADCs) are largely used in sensor acquisition applications. In the last few years, standalone $$\varDelta \varSigma $$ Δ Σ modulators have become increasingly available as off-the-shelf parts. To build a complete ADC, a standalone modulator has to be paired with some advanced elaboration unit, such as a field programmable gate array (FPGA) or a digital signal processor (DSP), which is needed for the implementation of the decimation filter. This work investigates the use of low-cost, general-purpose microcontrollers for the decimation of $$\varDelta \varSigma $$ Δ Σ -modulated signals. The main challenge is given by the clock frequency of the modulator, which can be in the range of a few $$\hbox {MHz}$$ MHz . The proposed technique deals with this limitation by employing two serial peripheral interface (SPI) modules in a time-interleaved configuration. This approach allows for continuous acquisition and elaboration of relatively high-speed, digital signals. The technique has been applied to a case study, and a data conversion system has been practically realized. The performance of the proposed filter is compared to that of a digital filter, present on board a commercial microcontroller, and the results of experimental tests are provided.

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“…In this article, an extended version of [18], a hybrid TD/resistor-based temperature sensor is proposed. It uses an inherently accurate TD sensor to calibrate an inaccurate, but energy-efficient, resistor-based sensor.…”

mentioning

confidence: 99%

A Self-Calibrated Hybrid Thermal-Diffusivity/Resistor-Based Temperature Sensor

Pan

Angevare

Makinwa

2021

IEEE J. Solid-State Circuits

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This article describes a hybrid temperature sensor in which an accurate, but energy-inefficient, thermal diffusivity (TD) sensor is used to calibrate an inaccurate, but efficient, resistor-based sensor. The latter is based on silicided polysilicon resistors embedded in a Wien-bridge (WB) filter, while the former is based on an electrothermal filter (ETF) made from a p-diffusion/metal thermopile and an n-diffusion heater. The use of an on-chip sensor for calibration obviates the need for an external temperature reference and a temperature-stabilized environment, thus reducing the cost. To mitigate the area overhead of the TD sensor, it reuses the WB filter's readout circuitry. Realized in a 180-nm CMOS technology, the hybrid sensor occupies 0.2 mm 2 . After calibration at room temperature (∼25 • C) and at an elevated temperature (∼85 • C), it achieves an inaccuracy of 0.25 • C (3σ ) from −55 • C to 125 • C. The WB sensor dissipates 66 μW from a 1.8-V supply and achieves a resolution of 450 μK rms in a 10-ms conversion time, which corresponds to a resolution figure-of-merit (FoM) of 0.13 pJ•K 2 . The sensor also achieves a sub-10-mHz 1/ f noise corner, which is comparable to that of bipolar junction transistor (BJT)-based temperature sensors.

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5.4 A Hybrid Thermal-Diffusivity/Resistor-Based Temperature Sensor with a Self-Calibrated Inaccuracy of ±0.25° C(3 Σ) from -55°C to 125°C

Cited by 10 publications

References 6 publications

A 0.7 V R‐2R SAR ladder‐based temperature sensor with less supply sensitivity

A 0.7 V R‐2R SAR ladder‐based temperature sensor with less supply sensitivity

Decimation of Delta-Sigma-Modulated Signals Using a Low-Cost Microcontroller

A Self-Calibrated Hybrid Thermal-Diffusivity/Resistor-Based Temperature Sensor

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