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Evaluation of Characteristic for Groundwater, Stream and Land Use in Haean basin, Yanggu Country
윤성찬(Sung Chan Yoon),박창현(Chang Hyun Park),조인형(In hyeong Jo),이재훈(Jae hoon Lee),박준완(Jun Wan Park),홍중락(Jung Rak Hong),이호건(Ho Geon Lee),전우현(Woo-Hyun Jeon),윤상웅(Sang Woong Yun),이진용(Jin-Yong Lee) 대한지질학회 2018 지질학회지 Vol.54 No.2
구광회(Kwang-Hoe Koo),채규성(Kyu-Sung Chae),윤상웅(Sang-Woong Yoon),김창우(Chang-Woo Kim) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.11
A quadrature voltage controlled oscillator(QVCO) with MOS-varactors has been designed for X-band applications. The QVCO consists of two cross -coupled differential cores. Using the TSMC CMOS libraries. harmonic balance simulation has been performed with the Agilent’s ADS. The QVCO exhibits the frequency tuning range from 7.03 ㎓ to 10.25 ㎓ with phase noise from -95 ㏈c/㎐ to -105 ㏈c/㎐ at an 1 ㎒-offset frequency. The total bias current is 49.6 ㎃ including four buffer amplifiers.
900 ㎒ 대역 고선형 CMOS 상향 주파수 혼합기 설계
장진석(Jin-suk Jang),채규성(Kyu-sung Chae),윤상웅(Sang-woong Yoon),김창우(Chang-woo Kim) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.11
A double-balanced frequency up-convener using the Gilbert cell structure has been designed with the TSMC 0.18 ㎛ CMOS library. The frequency up-converter consists of a core, IF balun, and LO balun block. In the core block, 4 source degeneration resistors are used to improve the mixer’s linearity. The frequency up-converter exhibits 12 ㏈ conversion gain with a 0 ㏈m P1㏈ for IF power of -11 ㏈m and LO power of 0 ㏈m inputs.
이지호(Ji-Ho Lee),채규성(Kyu-Sung Chae),윤상웅(Sang-Woong Yoon),김창우(Chang-Woo Kim) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.11
A vairable gain amplifier(VGA) has been designed for 900 ㎒-band applications. The VGA consist of three blocks; a control voltage feeding block, variable gain block, and constant gain block. The VGA has been simulated using the TSMC CMOS libraries. At 900 ㎒, the maximum gain is 34.6 ㏈ with an 1-㏈ gain compression output power of 3 ㏈m. The gain control range is 30 ㏈ from 3.8 ㏈ to 34.6 ㏈ by the control voltage from 0.9 to 3.0 V. The gain-control sensitivity of the VGA is 70 ㎷/㏈, which is larger than a thermal voltage (26 ㎷/㏈ at the room temperature) in order to be insensitive to temperature variation.
장진석(Jin-suk Jang),채규성(Kyu-sung Chae),윤상웅(Sang-woong Yoon),김창우(Chang-woo Kim) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.11
A single-side band double-balanced mixer using the Gilbert cell structure has been designed with the TSMC 0.18 ㎛ CMOS library. The SSB Up-Mixer consists of a core, IF balun-phase shifter, and LO balun-phase shifter block. In the core block, 4-source-coupled degeneration resistors are used to improve the mixer’s linearity. The SSB mixer exhibits a 15.4 ㏈ conversion gain with a 0.4 ㏈m P1㏈ for IF power of - 14 ㏈m and LO power of 0 ㏈m inputs. The image rejection ratio is - 23.7 ㏈c at a 0.4 ㏈m output power.