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X-band 송수신 모듈을 위한 높은 감쇠 정확도와 작은 위상 변동을 가진 6 비트 MMIC 디지털 감쇠기
주인권,염인복,이정원,이수호,안창수,김선주,박동운,오승엽,Ju, In-Kwon,Yom, In-Bok,Lee, Jeong-Won,Lee, Soo-Ho,Ahn, Chang-Soo,Kim, Sun-Joo,Park, Dong-Un,Oh, Seung-Hyeup 한국군사과학기술학회 2009 한국군사과학기술학회지 Vol.12 No.4
A 6-bit MMIC digital attenuator applicable to X-band TR module has been developed by using $0.5{\mu}m$GaAs pHEMT processes. The Switched-T attenuator scheme and the switched-path attenuator scheme were adopted to obtain low insertion loss and small phase variation, respectively. Resistors and transmission lines are optimized to achieve the digital attenuator with high attenuation accuracy and small phase variation. The digital attenuator has RMS error of 0.4dB, resolution of 0.5dB and dynamic range of 31.5dB. The measurement results show that in-out VSWRs are less than 1.5, phase variation is from -7 to +2 degrees and IIP3 is 36.5dBm.
오승엽 충남대학교 공업기술개발연구소 1976 工業技術開發硏究所論文集 Vol.3 No.1
An inexpensive and effective experimental model for an educational system of the logic circuit design is developed in this paper. The design of a mininum-cost full adder/substractor by this model illustlates the use of commonly used gates, the synthesis of several logic circuits, cost-minimization by real-life criteria. This model will be appropriate for a labortaory exersice of a senior course for digital engineering students.