• 한국재료학회지
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• 제33권12호
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• pp.537-549
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• 2023

The sintering shrinkage behaviors of low temperature cofired ceramics (LTCC) and resistors were compared using commercial LTCC and thick-film resistor pastes, and factors influencing the camber of cofired resistor/LTCC bi-layers were also investigated. The onset of sintering shrinkage of the resistor occurred earlier than that of LTCC in all resistors, but the end of sintering shrinkage of the resistor occurred earlier or later than that of LTCC depending on the composition of the resistor. The sintering shrinkage end temperature and the sintering shrinkage temperature interval of the resistor increased as the RuO₂/glass volume ratio of the resistor increased. The camber of cofired resistor/LTCC bi-layers was obtained using three different methods, all of which showed nearly identical trends. The camber of cofired resistor/LTCC bi-layers was not affected by either the difference in linear shrinkage strain after sintering between LTCC and resistors or the similarity of sintering shrinkage temperature ranges of LTCC and resistors. However, it was strongly affected by the RuO₂/glass volume ratio of the resistor. The content of Ag and Pd had no effect on the sintering shrinkage end temperature or sintering shrinkage temperature interval of the resistor, or on the camber of cofired resistor/LTCC bi-layers.

• 전기전자학회논문지
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• 제20권1호
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• pp.119-122
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• 2016

본 논문에서는 기존 LDO regulator에서 많이 사용 되는 피드백 저항을 Pseudo resistor를 이용하여 동작하기 위한 LDO regulator를 제안한다. 제안 된 Pesudo resistor를 사용한 Feedback network는 기존 피드백 저항보다 면적이 작으면서도 기존 LDO regulator의 역할을 하며, 노이즈를 갖는 LDO regulator의 단점을 보완하고자 제안되었다. 기존 LDO regulator와 비교하여 비슷한 성능을 가짐에도 불구하고, Overshoot를 감소시키고 면적을 줄여 더 높은 효율을 제공할 수 있다. 설계한 회로는 동부 하이텍의 0.18um CMOS 공정을 이용하였다.

• 반도체디스플레이기술학회지
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• 제18권2호
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• pp.67-72
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• 2019

This paper proposes a new method for the recognition of resistor color band using a color segmentation in a HSI color model. The proposed method firstly segments a resistor in a chromatic color as a ROI from a background. Secondly, the color bands of the resistor are segmented by vertical projection profile using both the intensity and the saturation differentiation and finally, it recognizes the colors of the segmented color bands using hue, saturation and intensity values. The final results are the value of the resistor and the names of the recognized color. The proposed method is implemented using C language in Raspberry Pi system with a camera module for a real-time image processing. Experiments were conducted by using various resistor images. The results show that the proposed method is successful for the recognition of resistor color band.

• 한국전기전자재료학회논문지
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• 제31권2호
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• pp.107-111
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• 2018

In this study, we designed the temperature coefficient of resistance (TCR) and heat radiation properties of shunt fixed resistors by adjusting the atomic composition of a metal alloy resistor, and fabricated a resistor that satisfied the designed properties. Resistors with similar atomic composition of copper and nickel showed low TCR and excellent shunt fixed resistor properties such as short-time overload, rated load, humidity load, and high temperature load. Finally, we expect that improved sensor accuracy will be obtained in current-distribution-type shunt fixed resistor for IoT sensors by designing the atomic composition of the metal alloy resistor proposed in this work.

• 한국세라믹학회지
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• 제51권4호
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• pp.344-349
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• 2014

$RuO_2$-based high frequency thick-film resistor paste was printed at the speed of 10, 100, 300 mm/sec on the AlN substrate, and then sintered at between 750 and $900^{\circ}C$. The sintered thick films were characterized in terms of printing and sintering conditions. With increasing printing speed, the thickness and roughness of sintered film increased. The resistance of the thick film resistor was reduced by increasing the printing speed from 10 to 100 mm/sec, but did not significantly change at 300 mm/sec speed. With increasing sintering temperature, the surface roughness and thickness of sintered resistor film decreased. The reduction rate was large in case of fast printed resistor. The resistance of the resistor increased up to $800^{\circ}C$ with sintering temperature, but again decreased at the higher sintering temperature.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 합동 추계학술대회 논문집 정보 및 제어부문
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• pp.253-256
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• 2002

A programmable CMOS negative resistor has been designed and fabricated in a 0.5um double poly double metal technology. The proposed CMOS negative resistor consists of a positive feedback OTA and a bump circuit with Gaussian-like I-V curve. Measurements of the fabricated chip confirm that the proposed CMOS resistor shows various negative resistance according to control voltage.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2003년도 하계학술대회 논문집 Vol.4 No.2
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• pp.764-767
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• 2003

Nowadays, the study on the ceramic components and modules using LTCC is being peformed and on the passives included in modules is being done also. Especillay frequency dependent components like capacitor and inductor are studied by many groups, but the behavior of embedded resistor in MCM-C module are not studied vigorously. The characteristics of embedded resistor in modules is different from that of resistor alone. In our research, behavior of embedded resistor is examined in the variation of position and geometrical parameters.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2004년도 하계학술대회 논문집 Vol.5 No.2
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• pp.599-602
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• 2004

Nowadays, the study on the ceramic components and modules using LTCC is being peformed and on the passives included in modules is being done also. Especillay frequency dependent components like capacitor and inductor are studied by many groups, but the behavior of embedded resistor in MCM-C module are not studied vigorously. The characteristics of embedded resistor in modules is different from that of resistor alone. In our research, behavior of embedded resistor is examined in the variation of position and geometrical parameters.

• 한국전기전자재료학회논문지
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• 제34권2호
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• pp.126-129
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• 2021

We fabricated plate typed shunt resistors composed of carbon nanotube (CNT) and metal alloy for measuring DC current. CNT plates were prepared from dispersed CNT/Urethane solution by squeezing method. Cu/Ni alloys were prepared from composition-designed alloy wires for adjusting the temperature coefficient of resistance (TCR) by pressing them. As well, we fabricated a hybrid resistor by squeezing the CNT/Urethane solution on the metal alloy plate directly. In order to confirm the composition ratio of the Cu/Ni alloy, we used an energy-dispersed X-ray spectroscopy (EDX). Cross-section and surface morphology were analyzed by using a scanning electron microscopy (SEM). Finally, we measured the initial resistance of 2.35 Ω at 25℃ for the CNT paper resistor, 7.56 mΩ for the alloy resistor, and 7.38 mΩ for the hybrid resistor. The TCR was also measured to be -778.72 ppm/℃ at the temperature range between 25℃ to 125℃ for the CNT paper resistor, 824.06 ppm/℃ for the alloy resistor, and 17.61 ppm/℃ for the hybrid resistor. Some of the hybrid resistors showed a near-zero TCR of 1.38, -2.77, 2.66, and 5.49 ppm/℃, which might be the world best-value ever reported. Consequently, we could expect an error-free measurement of the DC current using this resistor.

• 대한전자공학회논문지SD
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• 제45권4호
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• pp.72-77
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• 2008

본 논문에서는 Embedded resistor 적용을 위한 오개닉 기판 위에 캐버티(Cavity) 공정에 의해서 형성된 균일한 두께를 갖는 저항체의 제조 방법과 저항편차에 대해서 조사했다. 기존의 스크린 프린팅에 의해서 발생하는 PCB의 위치에 따른 저항값의 편차를 개선하기 위하여 캐버티 공정을 소개했다. 원하는 모양과 부피를 갖는 저항은 스크린 프린팅과 페이스트를 이용하여 cavity 공정에 의해 정확하게 형성되어 졌다. 이 방법은 PCB의 생산 공정시간을 줄일 수 있고, 스크린 프린팅의 정밀도에 의한 큰 영향 없이 빠르게 공정 조건을 배치할 수 있으므로써 생산량을 개선시킬 수 있다.