• 한국항행학회논문지
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• 제28권2호
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• pp.246-249
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• 2024

In this paper, we present a miniaturized differential line (DL) using inductance-enhanced corrugated ground planes (LCGP) for effective common-mode (CM) noise suppression in high-speed packages and printed circuit boards. The LCGP-DL demonstrates the CM noise suppression in the frequency range from 2.09 GHz to 3.6 GHz. Furthermore, to achieve the same low cutoff frequency, the LCGP-DL accomplishes a remarkable 23.2% reduction in size compared to a reference DL.

• Journal of Electrical Engineering and Technology
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• 제9권1호
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• pp.301-306
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• 2014

We proposed a new PCB-type 'common-mode current($I_c$) and differential-mode current($I_d$) detector' working for fast detection of $I_c$ and $I_d$ from the differential-mode signaling, with miniaturization effect and possibility of cheaper fabrication. In order to realize this device, we suggest a branch-line-coupler balun having a composite right- and left-handed(CRLH) one-layer microstrip phase-shifting line as compact as roughly ${\lambda}_g/14$. The presented balun obviously is different from the conventional bent-&-folded delay lines or slits on the ground for coupling the lines on the top and bottom dielectrics. As we connect the suggested balun output ports of the differential-mode signal lines via the through-port named U and coupled-port named L, $I_c$ and $I_d$ will appear at port ${\Delta}$ and port ${\Sigma}$ of the present device, in order. The validity of the design scheme is verified by the circuit-and numerical electromagnetic analyses, and the dispersion curve proving the metamaterial characteristics of the geometry. Besides, the examples of the $I_c$ and $I_d$ indicator are observed as the even and odd modes in differential-mode signal feeding. Also, the proposed device is shown to be very compact, compared with the conventional structure.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2004년도 ICCAS
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• pp.470-473
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• 2004

This paper presents conducted emission noise measurement from electronic equipment in frequency range of 1 MHz up to 30 MHz by small loop antenna. Small loop antenna measurement method can measure common-mode (CM) and differential-mode (DM) component of the noise on a pair of power line at the same time. The CM and DM can be measured separately. The theory of this measurement method is introduced and analyzed. The measured results were compared with the conventional measurement by Line Impedance Stabilization Network (LISN) and result a good trend between those methods.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 하계종합학술대회 논문집(1)
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• pp.21-24
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• 2000

In this paper, We introduce effective handoff method from W-COMA system of 3$^{rd}$ generation to 15-95 system of 2$^{nd}$ generation. In case of this handoff, Ms should know long code state using traffic channel, timing information and pilot offset of 26 synchronous system during the compressed mode. So We establish additional common channel in order to obtain handoff information. Common channel transmits same information from all base stations and provides MS with timing information of zero offset. long code state and timing of super frame for sync. channel. Therefore during the compressed mode. MS can obtain information for handoff using common channel..

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2006년도 추계학술대회 논문집 Vol.19
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• pp.43-44
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• 2006

We have studied electro-optical characteristics and stability of liquid crystal director depending on electrode patterning of common electrode on top substrate in patterned vertical alignment (PVA) mode. In the present studies, new type of common electrode pattern was suggested to enhance a dark state by reducing interference area due to data signal. According to the simulation result, PVA device with new common electrode pattern contributed to Improvement of an aperture ratio.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1993년도 하계학술대회 논문집 B
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• pp.794-796
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• 1993

This paper deals with the characteristic analysis of noise filter for the reduction of conduction noise, especially, common-mode noise. Attenuation in the system containing noise filter is analyzed and equivalent circuits for common- and differential- mode noise are derived. To clarify the effects by parasitic components of the inductor and capacitor, digital simulations using Design Center are carried out.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2020년도 전력전자학술대회
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• pp.106-108
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• 2020

This paper introduces a new pulse-width modulation (PWM) method to reduce common-mode voltages (CMVs) and compare its performance with other reduced CMV-PWM (RCMV-PWM) methods. To avoid the use of zero-vectors which cause high CMV peaks, the introduced method splits every reference vector into two vectors such that the peak-to-peak magnitude of CMV is reduced by one-third of conventional space-vector PWM (SVPWM). The performance of RCMV-PWMs altered by the modulation index are analyzed with simulation results.

• 대한전자공학회논문지SD
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• 제43권12호
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• pp.81-88
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• 2006

본 논문에서는 새로운 선형 연산 트랜스컨덕턴스 증폭기(OTA)를 제안한다. OTA의 선형성 향상을 위해 이동도 보상 회로와 공통모드 전압 조절기법을 적용했다. 이동도 보상 회로는 각각 트라이오드와 서브스레쉬홀드 영역에서 동작하는 트랜지스터의 경로를 연결하여 이동도 감소를 보상한다. 공통모드 전압 조절기법은 공통모드 피드백(CMFB)과 공통모드 피드포워드(CMFF)로 구성된다. 제안된 기술은 넓은 입력전압 스윙 범위에서 향상된 Gm의 선형성을 나타낸다. 제안된 OTA는 ${\pm}1.1V$의 입력전압 스윙 범위 내에서 ${\pm}1%$의 Gm변화율을 갖고 총고조파 왜곡(THD)은 -73dB 이하이다. 제안된 OTA는 $0.35{\mu}m$ n-well CMOS 공정에서 공급전압이 3.3V를 갖도록 설계되었다.

• 조명전기설비학회논문지
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• 제21권8호
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• pp.96-101
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• 2007

가스방전관(GDT)은 내부 정전용량이 작아서 통신용 서지보호기로 널리 사용되고 있는 소자이다. 하지만 가스방 전관의 동작개시를 위해서는 방전이 개시될 수 있는 충분한 전압과 시간이 필요하며, 이 동작개시전압은 피보호 회로가 서지에 민감한 장비일 경우 손상을 줄 수 있을 만큼 크므로 최근에는 조합 형태로 적용하는 경우가 대부분이다. 이렇게 초기 과전압이 상당 부분 존재하는 가스방전관에는 추가적으로 TVS나 필터 등을 통해 피크 전압을 제한해 주어야 한다. 본 논문에서는 공통모드 초크코일을 이용한 필터를 적용하여 공통모드와 차동모드의 조합회로를 구성하고, 주파수 대역이 다른 뇌임펄스 전압과 ring wave 전압을 인가하여 파형에 따른 조합회로의 특성을 확인하였다. 다단으로 보호되는 과정을 각각의 측정점에서 잔류전압을 측정하여 단계별로 적용한 SPD들이 어떻게 동작하는지를 실측데이터로 제시하였다. 각 단계의 잔류전압을 비교했을 때 공통모드에 비하여 차동모드에서 서지전압을 제한하는 성능이 보다 효과적이다.

• ETRI Journal
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• 제35권5호
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• pp.827-837
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• 2013

In this paper, we present wideband common-mode (CM) noise suppression using a vertical stepped impedance electromagnetic bandgap (VSI-EBG) structure for high-speed differential signals in multilayer printed circuit boards. This technique is an original design that enables us to apply the VSI-EBG structure to differential signals without sacrificing the differential characteristics. In addition, the analytical dispersion equations for the bandgap prediction of the CM propagation in the VSIEBG structure are extracted, and the closed-form expressions for the bandgap cutoff frequencies are derived. Based on the dispersion equations, the effects of the impedance ratio, the EBG patch length, and via inductances on the bandgap of the VSI-EBG structure for differential signals are thoroughly examined. The proposed dispersion equations are verified through agreement with the full-wave simulation results. It is experimentally demonstrated that the proposed VSI-EBG structure for differential signaling suppresses the CM noise in the wideband frequency range without degrading the differential characteristics.