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A Monolithic, 500 degrees C Operational Amplifier in 4H-SiC 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.
KTH, School of Information and Communication Technology (ICT), Integrated Devices and Circuits.ORCID iD: 0000-0001-6459-749X
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2014 (English)In: IEEE Electron Device Letters, ISSN 0741-3106, E-ISSN 1558-0563, Vol. 35, no 7, 693-695 p.Article in journal (Refereed) Published
Abstract [en]

A monolithic bipolar operational amplifier (opamp) fabricated in 4H-SiC technology is presented. The opamp has been used in an inverting negative feedback amplifier configuration. Wide temperature operation of the amplifier is demonstrated from 25 degrees C to 500 degrees C. The measured closed loop gain is around 40 dB for all temperatures whereas the 3 dB bandwidth increases from 270 kHz at 25 degrees C to 410 kHz at 500 degrees C. The opamp achieves 1.46 V/mu s slew rate and 0.25% total harmonic distortion. This is the first report on high temperature operation of a fully integrated SiC bipolar opamp which demonstrates the feasibility of this technology for high temperature analog integrated circuits.

Place, publisher, year, edition, pages
IEEE , 2014. Vol. 35, no 7, 693-695 p.
Keyword [en]
Bipolar integrated circuits (ICs), high temperature ICs, negative feedback, operational amplifiers
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-148621DOI: 10.1109/LED.2014.2322335ISI: 000338662100002Scopus ID: 2-s2.0-84903698786OAI: oai:DiVA.org:kth-148621DiVA: diva2:737280
Funder
Swedish Foundation for Strategic Research
Note

QC 20140812

Available from: 2014-08-12 Created: 2014-08-11 Last updated: 2017-12-05Bibliographically 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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