• Journal of the Institute of Electronics Engineers of Korea SD
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• v.41 no.6
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• pp.17-24
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• 2004

This paper describes a novel bit line structure to minimize coupling noise induced by coupling capacitance between bit lines. In DRAMs coupling capacitance is inherently present bit lines. As in submicron process the bit line space gets narrower. bit line coupling capacitance increases and this increased coupling capacitance sharply raises cross-talk noise. In this paper using different layers of metal for adjacent bit lines has been tested to reduces cross-talk noise and a novel bit line structure capable of reducing capacitance is introduced and verified.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.39 no.1
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• pp.49-57
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• 2002

Including RF Package inductance, substrate coupling through conductive silicon(Si)-substrate is modeled and quantitatively characterized. 2-port substrate coupling model is extended for the characterization of multi-port substrate coupling between digital circuit block and analog/RF circuit block. Furthermore, scalable parameter extraction model is developed. Multi-port substrate coupling can be investigated by linearly superposing a frequency-dependent 2-port substrate coupling model using scalable parameters. In addition, Substrate coupling including RF package inductance effect is quantitatively investigated. It is shown that package effect increases substrate coupling and shifts a characteristic frequencies(i.e., poles) to the higher frequency range. The proposed methodology can be efficiently used to the mixed-signal circuit performance verification.

• The Transactions of the Korean Institute of Power Electronics
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• v.6 no.1
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• pp.74-81
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• 2001

The sensorless scheme for Switched Reluctance Motor(SRM) drives must have the robustness and reliability because the noise and error are sensitive. These elements make electrically noisy environments due to the proximity of high current power circuits with small signal electronic circuits when SRM drives. Also, due to the leakage inductances and finite coupling capacitances, these can cause the noise on any low voltage current and voltage measurement circuit. The position estimate error occurs because the current and voltage including the noise are sued as the inputs of sensorless algorithm. In this paper the high robustness and resistance of input noise re described. The fuzzy logic based rotor estimation algorithm and the observer model are used to reduce the tolerance of input data.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.41 no.1
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• pp.71-80
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• 2004

A new SSN(Simultaneous Switching Noise) model is presented, which can afford to investigate SSN due to integrated circuit package. It is shown that previous SSN models are not accurate enough to be practical since they do not take decoupling capacitor into account. In this paper, a new SSN model including the decoupling capacitor is developed. It is verified that the model has excellent agreement(within $5\%$ error) with HSPICE simulation which employs TSMC 0.18um CMOS process technology.

• Journal of IKEEE
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• v.21 no.3
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• pp.248-251
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• 2017

In this paper, The proposed board is developed by EMI compliant Dash Camera with $360^{\circ}$ omni angle. The proposed board is designed by designing DM and CM input noise reduction circuit and applying active EMI filter coupling circuit. The DM and CM input noise reduction circuit design uses a differential op amp circuit to obtain the DM noise coupled to the input signal via the parasitic capacitance(CP). In order to simplify the circuit by applying the active EMI filter coupling circuit, a noise separator is installed to compensate the noise of the EMI source to compensate the CM and DM active filter simultaneously. In order to evaluate the performance of the board for the proposed EMI response, an authorized accreditation body has confirmed that the electromagnetic certification standard for each frequency band is satisfied.

• Proceedings of the KIPE Conference
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• 2016.07a
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• pp.193-194
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• 2016

일반적으로 자기장을 이용하는 무선전력 전송 방식은 노이즈, 금속 영향성, 발열, 위치에 따른 에너지 효율이 달라지는 문제점을 가지고 있다. 본 연구에서는 전기장을 이용하여 자동차 전, 후면에 있는 유리를 통해 전기자동차를 무선으로 충전하는 컨버터를 제안한다. 송, 수신부 회로는 유리를 유전체로 만들어진 작은 커패시터와 Quality-factor (Q-factor)를 보상하기 위해 두 개의 변압기를 이용한 임피던스 변환과 스위칭 손실을 최소화하기 위한 LLC직렬공진 동작을 사용하였다. 그 결과 제안하는 컨버터는 대용량 전력전송과 소프트 스위칭을 통한 높은 효율을 얻을 수 있었다. 제안하는 회로의 동작과 특성을 검증하기 위하여 유리를 이용한 커패시터를 구성하고 1.2KW 송, 수신 회로를 설계 및 제작하여 검증 하였다.

• Proceedings of the KIPE Conference
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• 2015.11a
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• pp.121-122
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• 2015

무선 전력 전송에서 자기장을 이용하는 방식은 인덕티브 커플링 방식과 자기 공진 방식이 있다. 자기 공진 방식은 송수신 코일의 크기를 작게 할 수 있고, 인덕티브 방식보다 전력 수신할 수 있는 범위가 넓다. 본 논문에서는 모바일 기기를 위한 자기 공진 무선 전력 전송의 표준 주파수로 유력한 6.78MHz 시스템을 구성하고, 직렬 공진 송신과 병렬 공진 수신을 제안한다. 전자파 노이즈를 억제하기 위하여 LC Low Pass Filter를 추가한 Half-bridge 인버터 송신 회로를 사용하여, 5.5W급 Smart phone 충전을 위한 Prototype을 제작 및 동작과 특성을 검증하였다.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.14 no.4
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• pp.338-347
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• 2021

In this paper, the beta-ray sensor circuit used in the true random number generator was designed using DB HiTek's 0.18㎛ CMOS process. The CSA circuit proposed a circuit having a function of selecting a PMOS feedback resistor and an NMOS feedback resistor, and a function of selecting a feedback capacitor of 50fF and 100fF. And for the pulse shaper circuit, a CR-RC2 pulse shaper circuit using a non-inverting amplifier was used. Since the OPAMP circuit used in this paper uses single power instead of dual power, we proposed a circuit in which the resistor of the CR circuit and one node of the capacitor of the RC circuit are connected to VCOM instead of GND. And since the output signal of the pulse shaper does not increase monotonically, even if the output signal of the comparator circuit generates multiple consecutive pulses, the monostable multivibrator circuit is used to prevent signal distortion. In addition, the CSA input terminal, VIN, and the beta-ray sensor output terminal are placed on the top and bottom of the silicon chip to reduce capacitive coupling noise between PCB traces.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.29 no.2
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• pp.142-145
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• 2018

In this paper, we present a design technique for the suppression of common-mode(CM) noise in switched-mode power supply boards using the segmentation method. By applying the segmentation method, the example structure is decomposed into two segments with decoupling capacitors and a recombination matrix is extracted for the segments. The effects of the decoupling capacitor on CM noise suppression are examined. The simulation time is significantly reduced on using the segmentation method.

• Journal of IKEEE
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• v.23 no.2
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• pp.474-478
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• 2019

In this paper, we analyze the degradation of receiving sensitivity due to the coupling between digital noise and mobile handset antenna using characteristic mode. First, we analyze the coupling mechanism between the antenna and digital noise, and analyze the role of the decoupling capacitor of the ground signal line, which is one of the ways to improve the antenna receiving sensitivity degradation due to camera noise. For the analysis, the digital signal line and the ground line of the FPCB of the camera module are modeled as a loop type feeder that excites the characteristic mode of the PCB ground, and improved model which has a ground line with a capacitor are analyzed.