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작은 정현파입력의 50% Duty Ratio 디지털 클럭레벨 변환기 설계
박문양,이종열,김욱,송원철,김경수,Park, Mun-Yang,Lee, Jong-Ryul,Kim, Ook,Song, Won-Chul,Kim, Kyung-Soo 한국통신학회 1998 韓國通信學會論文誌 Vol.23 No.8
휴대용 기기에서 자체 발진하여 클럭원으로 사용되는 TCXO의 출력과 같은 작은 진폭(400mV)의 정현파 입력을 내부 논리회로의 클럭원으로 사용하기 위한 파형정형 및 50%의 듀티 비(duty ratio)의 출력을 가지는 새로운 디지털 클럭레벨 변환기를 설계, 개발 하였다. 정, 부 두 개의 비교기, RS 래치, 차아지 펌프, 기준 전압 발생기로 구성된 새로운 신호 변환회로는 출력파형의 펄스 폭을 감지하고, 이 결과를 궤환루프로 구성하여 입력 비교기 기준 전압단자로 궤환시킴으로서 다지털 신호레벨의 정확한 50%의 듀티 비를 가진 출력을 생성할 수 있다. 개발한 레벨변환기는 ADC등의 샘플링 클럭원, PLL 또는 신호 합성기의 클럭원으로 사용할 수가 있다. 설계는 $0.8\mu\textrm{m}$ double metal double poly analog CMOS 공정을 사용하고, BSIM3 model을 사용하였으며, 실험결과 370mV의 정현파 입력율 50 + 3%의 듀티 비를 가진 안정된 논리레벨 출력 동작특성을 얻을 수 있었다. A new digital clock level translator has been designed in order to produce a clock source of the internal logic circuits. The translator output has 50% duty ratio from small sinusoidal input such as TCXO which oscillates itself in poratable components. The circuit consists of positive and negative comparators, RS latch, charge pump, and reference vol- tage generator. It detects pulse width of the output waveform and feedbacks the control signal to the input com-parator. It detects pulse width of the output waveform and feedbacks the control signal to the input com-parator reference, producing output waveform with valid 50% duty ratio of the digital signal level. The designed level translator can be used as a sampling clock source of ADC, PLL and the colck source of the clock synthesizer. The circuit wasdesigned in a 0.8.mu.m analog CMOS technology with double metal, double poly, and BSIM3 circuit simulation model. From our experimental results, a stable operating characteristics of 50 +3% duty ratio was obtained from the sinusoidal input wave of 370 mV.
장문기,박문양,박진수 청주대학교 산업과학연구소 1998 産業科學硏究 Vol.16 No.-
In the wireless channel, phase error between transmitter and receiver causes many problems We investigated the bit-error rate performance of a DS/SS signal, operating over a multipath Ravleigh lading channel, when corrupted by phase error as well as additive white Gaussian noise The phase error arises from phase locked loop dynamics and results in imperfect receiver phase estimates whereby the phase errors assume Tikhonov densities The phase estimates are used by a multipath-combining RAKE receiver for demodulation Results indicate that for a PLL with a loop SNR lOdB above the system E_(b)/no, the degradation is less than 3dB, and for a loop SNR of 20dB E_(b)/no, the degradation is 1dB
Trenched-Sinker LDMOSFET (TS-LDMOS) Structure for 2 GHz Power Amplifiers
김천수,박문양,유현규,Sung Do Kim 한국전자통신연구원 2003 ETRI Journal Vol.25 No.3
This paper proposes a new LDMOSFET structure with a trenched sinker for high-power RF amplifiers. Using a low-temperature, deep-trench technology, we succeeded in drastically shrinking the sinker area to one-third the size of the conventional diffusion-type structure. The RF performance of the proposed device with a channel width of 5 mm showed a small signal gain of 16.5 dB and a maximum peak power of 32 dBm with a power-added efficiency of 25% at 2 GHz. Furthermore, the trench sinker, which was applied to the guard ring to suppress coupling between inductors, showed an excellent blocking performance below –40 dB at a frequency of up to 20 GHz. These results confirm that the proposed trenched sinker should be an effective technology both as a compact sinker for RF power devices and as a guard ring against coupling.
Ku80의 DNA-PKcs 결합부위 합성 Peptide 투여에 의한 유방암세포의 DNA-dependent protein kinase 억제 효과
김충희,김태숙,문양수,정장용,강정부,김종수,강명곤,박희성 한국임상수의학회 2004 한국임상수의학회지 Vol.21 No.3
DNA double-strand break (DSB) is a serious treat for the cells including mutations, chromosome rearrangements, and even cell death if not repaired or misrepaired. Ku heterodimer regulatory DNA binding subunits (Ku70/Ku80) bound to double strand DNA breaks are able to interact with 470-kDa DNA-dependent protein kinase catalytic subunit (DNA-PKcs), and the interaction is essential for DNA-dependent protein kinase (DNA-PK) activity. The Ku80 mutants were designed to bind Ku70 but not DNA end binding activity and the peptides were treated in breast cancer cells for co-therapy strategy to see whether the targeted inhibition of DNA-dependent protein kinase (DNA-PK) activity sensitized breast cancer cells to ionizing irradiation or chemotherapy drug to develop a treatment of breast tumors by targeting proteins involved in damage-signaling pathway and/or DNA repair. We designed domains of Ku80 mutants, 26 residues of amino acids (HN-26) as a control peptide or 38 (HNI-38) residues of amino acids which contain domains of the membrane-translocation hydrophobic signal sequence and the nuclear localization sequence, but HNI-38 has additional twelve residues of peptide inhibitor region. We observed that the synthesized peptide (HNI-38) prevented DNA-PKcs from binding to Ku70/Ku80, resulting in inactivation of DNA-PK complex activity in breast cancer cells (MDA-465 and MDA-468). Consequently, the peptide treated cells exhibited poor to no DNA repair, and became highly sensitive to irradiation or chemotherapy drugs. The growth of breast cancer cells was also inhibited. These results demonstrate the possibility of synthetic peptide to apply breast cancer therapy to induce apoptosis of cancer cells.
생체전기 임피던스 측정기반 체성분분석기용 Analog-Front End 칩 최적화 설계 및 구현
구본태(Koo B.T.),박문양(Park M. Y.),백영석(Beak Y.S.),조민형(Cho M.H.),전영득(Jeon Y.D.) 대한전자공학회 2020 대한전자공학회 학술대회 Vol.2020 No.11
The body composition analyzer is a medical device that analyzes the body impedance, which is a component of the human body, by analyzing the bio-impedance generated when passing a minute current that is harmless to the human body. In this paper, we present the results of the design and implementation of the analog front end chip, which is the core technology of body composition analyzer.