• 전기학회논문지
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• 제56권11호
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• pp.1967-1971
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• 2007

In this paper, we verified basic forms and equivalent circuits of spiral inductors and various kinds of parasitics of equivalent circuits by using HFSS and Nexxim program that were 3-D EM analysis tools, and fabrication on-chip spiral inductors using Hynix's 0.25um 1-poly and 5-metal CMOS process. Comparing with PGS(patterned ground shield) and NPGS(non patterned ground shield) of spiral inductors of 3.5 turn, 4.5 turn and 5.5 turn, etc, the application of PGS could improve maximum Q value by 8-12%.

• Advances in materials Research
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• 제1권1호
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• pp.37-49
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• 2012

In this paper, we present modeling and characterization of CNT-based TSVs to be used in high-frequency RF applications. We have developed an integrated model of CNT-based TSVs by incorporating the quantum confinement effects of CNTs with the kinetic inductance phenomenon at high frequencies. Substrate parasitics have been appropriately modeled as a monolithic microwave capacitor with the resonant line technique using a two-polynomial equation. Different parametric variations in the model have been outlined as case studies. Furthermore, electrical performance and signal integrity analysis on different cases have been used to determine the optimized configuration for CNT-based TSVs for high frequency RF applications.

• ETRI Journal
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• 제26권1호
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• pp.57-60
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• 2004

We propose an inductive compensation method for a surface-mountable 10 Gbps photoreceiver module. Since many typical 10 Gbps photoreceiver modules consist of a photodetector and low-noise pre-amplifier, the impedance mismatch between the photodetector and pre-amplifier, as well as package parasitics, may reduce the frequency bandwidth. In this paper, we inserted an inductive component between the photodetector and pre-amplifier in order to create frequency bandwidth expansion. From the measurement results, we have found that the proposed technique can increase the -3 dB bandwidth about 4.2 GHz wider compared with an uncompensated module. And, from a bit-error rate (BER) test, we observed -15.7 dB sensitivity at $10^{-12}$ BER. This inductive compensation can be implemented easily and is compatible with common manufacturing processes of photoreceiver modules.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 제38회 하계학술대회
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• pp.1106-1107
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• 2007

Planar magnetic based design technologies have been widely applied to power design for better cooling and ease of fabrication. The planar transformer and the planar inductor have a low profile characteristics compare to the conventional transformer which would be more cubical in volume. High frequency operation of magnetic components is a main key to achieve high power density of the power module. However, at a high frequency, the skin effect and the proximity effect have to be considered very significantly in magnetic design and also the parasitics in the converter cannot be ignored. This paper deals with the design and the experiment of planar integrated magnetic component. The optimal design for planar magnetics is summarized.

• 대한전자공학회논문지TC
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• 제42권7호
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• pp.57-62
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• 2005

본 논문에서는 마이크로파 SPDT 스위치를 GaAs pHEMT 공정을 이용하여 설계 및 제작하였다. 광대역 스위치 설계를 위하여 CPW로 구현한 임피던스 변환회로를 삽입하여 온-저항과 오프-커패시턴스를 줄임으로서 낮은 삽입손실과 높은 격리도를 갖는 구조를 구현하였다. 변환회로를 구성하는 전송선로의 소자 개수와 병렬로 삽입되는 FET의 개수는 시물레이션을 통해 최적의 값으로 설계하였다. 설계된 스위치의 측정 결과 53$\~$ 61 GHz 대역에서 2.6 dB 이하의 삽입손실과 24 dB 이상의 격리도를 얻었다.

• 대한전자공학회논문지SD
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• 제43권7호
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• pp.29-37
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• 2006

본 논문에서는 온칩 디커플링 커패시터에 의한 파워/그라운드 라인에서의 RLC 공진현상을 감소시키기 위한 해석적인 모델을 제시한다. 패키지 인덕턴스와 온칩 디커플링 커패시터 및 출력 드라이버로 인하여 형성되는 RLC 공진 회로의 공진주파수를 정확하게 예측하였다. 예측된 공진주파수를 이용하여 회로 동작에 필요한 적절한 디커플링 커패시터의 크기를 결정할 수 있다. 본 논문에서 제시한 공진현상을 감소시킬 수 있는 새로운 설계 방법의 타당성은 $0.18{\mu}m$ 공정 HSPICE 모텔을 사용한 시뮬레이션을 통하여 검증하였다.

• 전자공학회논문지C
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• 제36C권11호
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• pp.18-28
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• 1999

RFIC 설계를 위한 새로운 패키지(SOP, Small Outline Package) 등가 회로 모델을 제시한다. RF 영역의 패키지에서 패들(paddle)은 이상적인 그라운드(ground)로 동작하지 못하며 패들과 MMIC 다이(die) 사이의 커플링(coupling) 문제 및 손실에 의한 기생 효과로 인해 MMIC 회로에 심각한 영향을 준다. 패키지의 전기적 효과에 대한 새로운 등가 회로 모델과 파라미터(parameter) 추출 방법을 SOP 패키지를 예로 들어 제시한다. 제시한 모델의 정확성은 상용 full-wave solver와 제시한 모델을 HSPICE 시뮬레이션하여 구한 5-파라미터를 상호 비교함으로써 모델의 정확성을 평가하고 모델이 약 8㎓까지 full-wave 해석 결과와 일치함을 보인다.

• 한국전자파학회:학술대회논문집
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• 한국전자파학회 2003년도 종합학술발표회 논문집 Vol.13 No.1
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• pp.294-298
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• 2003

In this paper, the modeling and design of high-Q multilayer passives have been investigated, and multilayer diplexer for GSM/DCS applications has been designed and fabricated using the passives. To minimize the system, the configuration of a multilayer inductor has involved a square spiral structure. Modeling of a multilayer inductor was performed by the subsystems of distributed components, and using the modeling the optimal structures of the high-Q multilayer inductor could be designed by analyzing parasitics and couplings which affect their frequency characteristics. Multilayer diplexer for GSM/DCS application has been designed and fabricated using LTCC technology. LPF for GSM band had the passband insertion loss of less than 0.55 dB, the return loss of more than 12 dB, and the isolation level of more than 26 dB by locating attenuation pole at 1800 MHz. HPF for DCS band had the passband insertion loss of less than 0.82 dB, the return loss of more than 11 dB, and the isolation level of more than 38 dB by locating attenuation pole at 930 MHz.

• 한국수산과학회지
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• 제44권5호
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• pp.484-489
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• 2011

This study examined whether N-acetylcysteine (NAC), a glutathione precursor, could attenuate toxic effects of three fish anti-parasitic agents, trichlorfon, hydrogen peroxide ($H_2O_2$) and formalin, all of which are known to exert side effects through free radical production. Common carp Cyprinus carpio were fed with NAC (approx. 50 mg/kg/day) for 3 consecutive days prior to anti-parasite bathing for a 24 hr period. Mortality rates were examined during this 24 hr bathing period, and selected hematological and biochemical parameters were also assessed at the termination of anti-parasite exposure. The mortality rates and plasma glucose elevations caused by all three anti-parasitics were significantly reduced by NAC pretreatment. Trichlorfon, but not $H_2O_2$ or formalin, elevated plasma levels of aspartatetransaminase (AST) and alanine-transaminase (ALT), and these elevations were attenuated by NAC. There was no change in hematocrit values in any treatment. The results provide evidence for the attenuating effects of NAC against toxicity caused by anti-parasite agents that act through free radical-producing properties. The results found in this study also suggest that NAC may be administered to fish to minimize toxicity in fish parasiticide use.

• 응용통계연구
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• 제18권1호
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• pp.27-41
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• 2005

『전국 장내 기생충 감염실태조사』를 위해 새로운 표본설계를 하였다. 2000년 인구 주택총조사의 10% 표본조사자료를 조사모집단으로 사용하였고, 조사의 특성상 각종 기생충의 감염율이 아주 낮은 관계로 통상적인 분석방법 대신에 상대위험도과 오즈비를 사용하였다. 표본배정은 네이만 배정의 절충형을 사용하였다. 또한 전국 단위와 특성별 추정이 가능하도록 하였고 추정의 정확성을 측정하기 위해 추정량의 분산식을 유도하였다.