A linear CMOS temperature sensor with an inaccuracy of ±0.15°C

Lin, Chun Wei; Lin, Sheng Feng

doi:10.1587/elex.9.1556

Cited by 6 publications

(6 citation statements)

References 8 publications

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“…8(a) shows the architecture of Class D audio amplifier [6]. The over temperature protection system consists of the temperature sensor [7], the triangular wave generator and the varactor which Fig. 8(b), Fig.…”

Section: Application and Implement Of The Proposed Varactormentioning

confidence: 99%

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A Study on Integrated Continuous Varactor

Wei¹

2016

Fourth International Conference on Advances in Computing, Control and Networking - ACCN 2016

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Abstract-The continuous varactor is an adjustable storage element often used in filter, resonant and delay control circuit. This paper presents the method to implement linear integrated continuous varactor. Through driving several MOS capacitors into inversion-mode (IMOS) with different bias, various characteristics arise in the capacitance with respect to overdrive voltage. The IMOS with various capacitances can be further utilized to synthesize a wide range linear varactor. By using TSMC 0.35um CMOS process, the implemented varactor provides ±33% tunable capacitance within ±12% tuning range of voltage. In addition, the integrated varactor reaches picofarad scale which is considerably practical in many applications.

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Section: Application and Implement Of The Proposed Varactormentioning

confidence: 99%

“…(a) Figure 8 (a) the architecture of Class D audio amplifier [6], (b) the temperature sensor [7], (c) the triangular wave generator, (d) the continuous varactor.…”

Section: Application and Implement Of The Proposed Varactormentioning

confidence: 99%

A Study on Integrated Continuous Varactor

Wei¹

2016

Fourth International Conference on Advances in Computing, Control and Networking - ACCN 2016

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“…To produce digital codes for communicating with VLSI systems, analog-to-digital converters (ADCs) have been integrated into temperature sensors to create “smart temperature sensors” [ 4 , 5 , 6 , 7 , 8 ]. Temperature sensors based on bipolar junction transistors are utilized to translate the temperature to a voltage signal proportional to the absolute temperature (PTAT), and then an ADC is used for digital temperature readings.…”

Section: Introductionmentioning

confidence: 99%

“…Temperature sensors based on bipolar junction transistors are utilized to translate the temperature to a voltage signal proportional to the absolute temperature (PTAT), and then an ADC is used for digital temperature readings. Sophisticated circuits using additional on-chip calibration techniques are frequently used to ensure accuracy and full compatibility with the standard CMOS process [ 2 , 3 , 4 , 5 , 6 , 7 , 8 ]. Excellent performance, specifically, an extremely high accuracy of ±0.1 °C (3σ) and a low power dissipation of tens of microwatts, has been achieved.…”

Section: Introductionmentioning

confidence: 99%

All-Digital Time-Domain CMOS Smart Temperature Sensor with On-Chip Linearity Enhancement

Chen

Lin

2016

Sensors

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This paper proposes the first all-digital on-chip linearity enhancement technique for improving the accuracy of the time-domain complementary metal-oxide semiconductor (CMOS) smart temperature sensor. To facilitate on-chip application and intellectual property reuse, an all-digital time-domain smart temperature sensor was implemented using 90 nm Field Programmable Gate Arrays (FPGAs). Although the inverter-based temperature sensor has a smaller circuit area and lower complexity, two-point calibration must be used to achieve an acceptable inaccuracy. With the help of a calibration circuit, the influence of process variations was reduced greatly for one-point calibration support, reducing the test costs and time. However, the sensor response still exhibited a large curvature, which substantially affected the accuracy of the sensor. Thus, an on-chip linearity-enhanced circuit is proposed to linearize the curve and achieve a new linearity-enhanced output. The sensor was implemented on eight different Xilinx FPGA using 118 slices per sensor in each FPGA to demonstrate the benefits of the linearization. Compared with the unlinearized version, the maximal inaccuracy of the linearized version decreased from 5 °C to 2.5 °C after one-point calibration in a range of −20 °C to 100 °C. The sensor consumed 95 μW using 1 kSa/s. The proposed linearity enhancement technique significantly improves temperature sensing accuracy, avoiding costly curvature compensation while it is fully synthesizable for future Very Large Scale Integration (VLSI) system.

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“…Compared with two-point calibration, one-point calibration halves the test cost. Thus, the test cost of high-volume production is higher than that of voltage-domain sensors that achieve acceptable inaccuracy by using one-point calibration and voltage-domain curvature correction techniques [ 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

A Linearity-Enhanced Time-Domain CMOS Thermostat with Process-Variation Calibration

Chen

Lin

2014

Sensors

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This study proposes a linearity-enhanced time-domain complementary metal-oxide semiconductor (CMOS) thermostat with process-variation calibration for improving the accuracy, expanding the operating temperature range, and reducing test costs. For sensing temperatures in the time domain, the large characteristic curve of a CMOS inverter markedly affects the accuracy, particularly when the operating temperature range is increased. To enhance the on-chip linearity, this study proposes a novel temperature-sensing cell comprising a simple buffer and a buffer with a thermal-compensation circuit to achieve a linearised delay. Thus, a linearity-enhanced oscillator consisting of these cells can generate an oscillation period with high linearity. To achieve one-point calibration support, an adjustable-gain time stretcher and calibration circuit were adopted for the process-variation calibration. The programmable temperature set point was determined using a reference clock and a second (identical) adjustable-gain time stretcher. A delay-time comparator with a built-in customised hysteresis circuit was used to perform a time comparison to obtain an appropriate response. Based on the proposed design, a thermostat with a small area of 0.067 mm2 was fabricated using a TSMC 0.35-μm 2P4M CMOS process, and a robust resolution of 0.05 °C and dissipation of 25 μW were achieved at a sample rate of 10 samples/s. An inaccuracy of −0.35 °C to 1.35 °C was achieved after one-point calibration at temperatures ranging from −40 °C to 120 °C. Compared with existing thermostats, the proposed thermostat substantially improves the circuit area, accuracy, operating temperature range, and test costs.

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A linear CMOS temperature sensor with an inaccuracy of ±0.15°C

Cited by 6 publications

References 8 publications

A Study on Integrated Continuous Varactor

A Study on Integrated Continuous Varactor

All-Digital Time-Domain CMOS Smart Temperature Sensor with On-Chip Linearity Enhancement

A Linearity-Enhanced Time-Domain CMOS Thermostat with Process-Variation Calibration

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