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A 500 degrees C 8-b Digital-to-Analog Converter in Silicon Carbide Bipolar Technology
KTH, School of Information and Communication Technology (ICT), Integrated Devices and Circuits.
KTH, School of Information and Communication Technology (ICT), Integrated Devices and Circuits.
KTH, School of Information and Communication Technology (ICT), Integrated Devices and Circuits.ORCID iD: 0000-0001-6459-749X
KTH, School of Information and Communication Technology (ICT), Integrated Devices and Circuits.ORCID iD: 0000-0003-3802-7834
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2016 (English)In: IEEE Transactions on Electron Devices, ISSN 0018-9383, E-ISSN 1557-9646, Vol. 63, no 9, 3445-3450 p.Article in journal (Refereed) Published
Abstract [en]

High-temperature integrated circuits provide important sensing and controlling functionality in extreme environments. Silicon carbide bipolar technology can operate beyond 500 degrees C and has shown stable operation in both digital and analog circuit applications. This paper demonstrates an 8-b digital-to-analog converter (DAC). The DAC is realized in a current steering R-2R configuration. High-gain Darlington current switches are used to ensure ideal switching at 500 degrees C. The measured differential nonlinearity (DNL) and integral nonlinearity (INL) at 25 degrees C are 0.79 and 1.01 LSB, respectively, while at 500 degrees C, the DNL and INL are 4.7 and 2.5 LSB, respectively. In addition, the DAC achieves 53.6 and 40.6 dBc of spurious free dynamic range at 25 degrees C and 500 degrees C, respectively.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2016. Vol. 63, no 9, 3445-3450 p.
Keyword [en]
Bipolar ICs, bipolar junction transistor (BJT), current steering R-2R digital-to-analog converter (DAC), high temperature, silicon carbide (SiC), Spice Gummel-Poon
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-194477DOI: 10.1109/TED.2016.2588418ISI: 000384574400011Scopus ID: 2-s2.0-84979781492OAI: oai:DiVA.org:kth-194477DiVA: diva2:1040982
Funder
Swedish Foundation for Strategic Research
Note

QC 20161031

Available from: 2016-10-31 Created: 2016-10-28 Last updated: 2017-09-05Bibliographically approved
In thesis
1. High-Temperature Analog and Mixed-Signal Integrated Circuits in Bipolar Silicon Carbide Technology
Open this publication in new window or tab >>High-Temperature Analog and Mixed-Signal Integrated Circuits in Bipolar Silicon Carbide Technology
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Silicon carbide (SiC) integrated circuits (ICs) can enable the emergence of robust and reliable systems, including data acquisition and on-site control for extreme environments with high temperature and high radiation such as deep earth drilling, space and aviation, electric and hybrid vehicles, and combustion engines. In particular, SiC ICs provide significant benefit by reducing power dissipation and leakage current at temperatures above 300 °C compared to the Si counterpart. In fact, Si-based ICs have a limited maximum operating temperature which is around 300 °C for silicon on insulator (SOI). Owing to its superior material properties such as wide bandgap, three times larger than Silicon, and low intrinsic carrier concentration, SiC is an excellent candidate for high-temperature applications. In this thesis, analog and mixed-signal circuits have been implemented using SiC bipolar technology, including bandgap references, amplifiers, a master-slave comparator, an 8-bit R-2R ladder-based digital-to-analog converter (DAC), a 4-bit flash analog-to-digital converter (ADC), and a 10-bit successive-approximation-register (SAR) ADC. Spice models were developed at binned temperature points from room temperature to 500 °C, to simulate and predict the circuits’ behavior with temperature variation. The high-temperature performance of the fabricated chips has been investigated and verified over a wide temperature range from 25 °C to 500 °C. A stable gain of 39 dB was measured in the temperature range from 25 °C up to 500 °C for the inverting operational amplifier with ideal closed-loop gain of 40 dB. Although the circuit design in an immature SiC bipolar technology is challenging due to the low current gain of the transistors and lack of complete AC models, various circuit techniques have been applied to mitigate these problems. This thesis details the challenges faced and methods employed for device modeling, integrated circuit design, layout implementation and finally performance verification using on-wafer characterization of the fabricated SiC ICs over a wide temperature range.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2017. 107 p.
Series
TRITA-ICT, 2017:16
Keyword
silicon carbide (SiC), bipolar junction transistor (BJT), high temperature, SiC integrated circuit, Spice Gummel-Poon (SGP), operational amplifier (opamp), negative feedback amplifier, bandgap reference, masterslave comparator, digital-to-analog converter (DAC), analog-to-digital converter (ADC), flash ADC, successive approximation register (SAR) ADC
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electrical Engineering
Identifiers
urn:nbn:se:kth:diva-213697 (URN)978-91-7729-496-2 (ISBN)
Public defence
2017-09-29, Ka-Sal A (Sal Östen Mäkitalo), Kistagången 16, Kista, Stockholm, 13:00 (English)
Opponent
Supervisors
Funder
Swedish Foundation for Strategic Research
Note

QC 20170905

Available from: 2017-09-05 Created: 2017-09-05 Last updated: 2017-09-18Bibliographically approved

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