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무선 중계기용 저전력, 고선형 Up-down Converter
홍남표(Nam Pyo Hong),김광진(Kwang Jin Kim),장종은(Jong-Eun Jang),최영완(Young-Wan Choi) 대한전기학회 2015 전기학회논문지 Vol.64 No.3
We have designed and fabricated a low power and high linearity up down convertor for wireless repeaters using 0.35 ㎛ SiGe Bipolar CMOS technology. Repeater is composed of a wideband up/down converting mixer, programmable gain amplifiers (PGA), input buffer, LO buffer, filter driver amplifier and integer-N phase locked loop (PLL). As of the measurement results, OIP3 of the down conversion mixer and up conversion mixer are 32 dBm and 17.8 dBm, respectively. The total dynamic gain range is 31 dB with 1 dB gain step resolution. The adjacent channel leakage ratio (ACLR) is 59.9 dBc. The total power consumption is 240 mA at 3.3 V.
하인두암에서의 하부경계 파악을 위한 자기공명영상활영술의 유용성
진영완,이동엽,홍남표,송영호,최희석,안회영,Jin, Young-Wan,Lee, Dong-Yeup,Hong, Nam-Pyo,Song, Young-Ho,Choi, Hee-Suck,Ahn, Hwoe-Young 대한기관식도과학회 2000 大韓氣管食道科學會誌 Vol.6 No.1
Background and Objectives:Submucosal spread of hypopharyngeal canceris frequently incriminated for the high incidence of local recurrence after resection. Although mucosal spread is better detected by means of direct visualization, submucosal spread is better evaluated by using cross-sectional imaging rather than endoscopy. This study was designed to evaluate the efficacy of MRI in diagnosing involvement of inferior margin of hypopharyngeal cancer. Materials and Method : Eight patients with hypopharyngeal cancer underwent MRI prior to surgery. And postoperative histopathopogic involvement of tumor was compared with the preoperative MRI axial scan. Results : In preoperative MRI findings, involvement of pyriform sinus apex was 6 cases(definitive 5 cases, probable 1 cases), that of esophageal inlet was 1 case(probable), that of cervical esophagus was 1 case(probable). In postoperative histopathologic findings, the results were same. Conclusion : MRI evaluation for patient with hypopharyngeal cancer ensures accurate staging and provides essential information about the tumor involvement of inferior margin. And there is needed to be thin section thickness in evaluation of inferior margin of hypopharyngeal cancer.
남규현(Kyu-Hyun Nam),김지은(Ji-Eun Kim),이석재(Seok-Jae Lee),임수강(Soo-Ghang Im),홍남표(Nam-Pyo Hong),박준석(Jun-Seok Park) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.10
본 논문은 주파수체배기에서 출력의 발진을 방지하려는 방법을 제안한다. 제안하는 발진을 방지하기 위한 전압제어루프는 CMOS 65nm 공정을 이용하여 설계하였으며, 피크 검출기와 비반전 증폭기로 구성되어 있다.
IMD 상쇄기를 적용한 CMOS 구동 증폭기 선형화 방법
김도균(Do-Gyun Kim),홍남표(Nam Pyo Hong),문연태(Yon-Tae Moon),최영완(Young-Wan Choi) 대한전기학회 2009 전기학회논문지 Vol.58 No.5
We have designed and fabricated a linear drive amplifier with a novel intermodulation distortion (IMD) canceller using 0.18 ㎛ CMOS process. The drive amplifier with IMD canceller is composed of a cascode main amplifier and an additional common-source IMD canceller. Since the IMD canceller generates IM3 (3<SUP>rd</SUP>-order imtermodulation) signal with 180° phase difference against the IM3 of the cascode main amplifier, the IM3 power is drastically eliminated. As of the measurement results, OP1㏈, OIP3, and power-add efficiency are 5.5 ㏈m, 15.5 ㏈m, and 21 %, respectively. Those are 5 ㏈, 6 ㏈, and 13.5 % enhanced values compared to a conventional cascode drive amplifier. The IMD3 of the drive amplifier with IMD canceller is enhanced more than 10 ㏈ compared to that of the conventional cascode drive amplifier for input power ranges from -22 to -14 ㏈m.