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dc.contributor.advisor Lee, Jung Hyup -
dc.contributor.author Choi, Bong Sik -
dc.date.accessioned 2017-05-10T08:54:10Z -
dc.date.available 2017-01-18T00:00:00Z -
dc.date.issued 2017 -
dc.identifier.uri http://dgist.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000002326915 en_US
dc.identifier.uri http://hdl.handle.net/20.500.11750/1525 -
dc.description.abstract This thesis is looks into a low-power large-dynamic-range time-domain interface circuit for resistive gas sensors. Recently, as the pollution of the air has attracted attention as a social problem, the regulation of the harmful gas of the government is becoming more and more subdivided. Gas sensor measurement systems are required to satisfy various gas sensor measurement ranges in order to satisfy the subdivided values according to the gas. One of the features of the thesis is that an inverter, which is able to change size, was applied to proceed with a low-power method and a signal was processed in time domain to possess wide measurement range. Another feature of the thesis is that by using swing-boosting method, this circuit has an advantage on noise characteristic. The size of the inverter is controlled by the size of the oscillator and the size of the inverter is controlled according to the operating frequency. The other feature is that it enables to adjust resolution in accordance with related purpose, using frequency divider. Besides, it enables to maintain optimal performance even in any resistance value through scalable method and frequency divider applied resolution adjustment. It is characterized by the ability to maintain optimal performance at any resistance value through resolution control using the size adjustment method and frequency divider. Hynix/Dongbu HiTek 0.18 process is applied through IDEC MPW. The circuit size is 0.35〖mm〗^2, and power consumption is 150uW in 1V operation voltage. ⓒ 2017 DGIST -
dc.description.tableofcontents 1.Introduction 1 --
1.1Motivation 1 --
1.2Gas sensing principle and resistance ranges 2 --
1.3Resistance read-out methods 4 --
1.4Proposed system and target specification 7 --
1.5Oscillator 8 --
2.Background information: Frequency stability 12 --
2.1Frequency domain 12 --
2.2Time domain definitions 14 --
2.3Power-law noise models 15 --
2.4Wiener-Khinchine theorem 16 --
2.5Phase noise for designing oscillator 17 --
2.6FOM 17 --
3.Noise analysis 19 --
3.1Input referred noise of inverter 19 --
3.2Noise contribution to phase noise 21 --
4.System structure & Operation principle 31 --
4.1Structure block diagram 31 --
4.2Details of each blocks 32 --
4.3Measurement operation and equations 37 --
4.4Sensing resolution and Trade-off with measurement time 40 --
5.Schematic design and Layout 41 --
5.1Schematic design 41 --
5.2Layout 45 --
6.Simulation results 48 --
6.1Post layout simulation: Oscillator 48 --
6.2Post layout simulation: Programmable frequency converter and Frequency-to-Digital converter 49 --
6.3Size optimization of scalable inverter based oscillator 50 --
7.Conclusion & Future work 51 --
8.Reference 53
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dc.format.extent 54 -
dc.language eng -
dc.publisher DGIST -
dc.subject Resistance read-out system -
dc.subject Time domain -
dc.subject Scalable inverter -
dc.subject Swing-boost -
dc.subject PVT variation insensitive -
dc.subject 크기 조절 반전기 -
dc.subject 시간 도메인 -
dc.subject 저항 측정용 회로 -
dc.title A Low-Power Large-Dynamic-Range Time-Domain Interface Circuit for Resistive Gas Sensors -
dc.title.alternative 저항식 가스센서 측정을 위한 저전력 넓은 동적범위를 갖는 시간 도 메인 인터페이스 회로 설계 -
dc.type Thesis -
dc.identifier.doi 10.22677/thesis.2326915 -
dc.description.alternativeAbstract 본 논문에서는 저전력으로 동작하는 넓은 측정 범위를 갖는 시간 도메인 저항식 가스센서 측정용 회로를 설계하였다. 최근 대기오염이 사회문제로 주목 받음에 따라 정부의 유해가스 규제가 세분화 되고 있다. 가스에 따라 세분화 된 수치를 만족시키기 위해서는 다양한 가스센서의 측정범위를 만족시키기 위한 가스센서 측정 시스템이 필요하다. 본 논문이 갖는 특징으로는 주파수를 만드는 발진기를 저전력 방식으로 동작하면서도 고성능 회로를 실현하기 위해 주파수에 따라 크기를 가변 할 수 있는 반전기를 사용하였고, swing-boosting 기법을 사용하여 노이즈에 강한 특성을 가지게 하였다. 발진기 내부의 크기 조절 반전기를 통해 동작 주파수에 따라 반전기의 크기를 조절을 통해 큰 크기의 반전기가 지터를 감소시켜 디지털 출력의 해상도를 높일 수 있도록 하였다. 또한 넓은 측정 범위를 갖기 위해 신호를 시간 도메인에서 처리하도록 하였고 목적에 따라 주파수 분주기를 통해 측정시간을 조절하여 해상도를 조절 할 수 있게 하였다. 크기 조절방식과 주파수 분주기를 사용한 해상도 조절을 통해 어떠한 저항 값에서도 최적의 성능을 유지 할 수 있는 특징이 있다. 설계는 IDEC MPW를 통한 하이닉스/동부하이텍 0.18μm 공정을 사용했으며, 회로의 크기는 0.35〖mm〗^2이고, 동작전압 1V에서 파워소모는 150uW이다. ⓒ 2017 DGIST -
dc.description.degree Master -
dc.contributor.department Information and Communication Engineering -
dc.contributor.coadvisor Je, Min Kyu -
dc.date.awarded 2017. 2 -
dc.publisher.location Daegu -
dc.description.database dCollection -
dc.date.accepted 2017-01-18 -
dc.contributor.alternativeDepartment 대학원 정보통신융합공학전공 -
dc.contributor.affiliatedAuthor Choi, Bong Sik -
dc.contributor.affiliatedAuthor Lee, Jung Hyup -
dc.contributor.affiliatedAuthor Je, Min Kyu -
dc.contributor.alternativeName 최봉식 -
dc.contributor.alternativeName 이정협 -
dc.contributor.alternativeName 제민규 -
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Department of Electrical Engineering and Computer Science Theses Master

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