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BLE Application을 위한 55nm CMOS 공정의 고속, 저전력, Programmable Frequency Divider 설계
안현수(Hyun-Su An),양동암(Dong-Am Yang),서정환(Jung-Hwan Seo),서동현(Dong-Hyun Seo),이강윤(Kang-Yoon Lee) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.11
In this paper, high speed CMOS Frequency Divider in Phase Locked Loop(PLL) of Bluetooth Low Energy(BLE) is proposed. This newly proposed True Single Phase Clock (TSPC) to reduce power and glitch. By changing schematic and size of PMOS, proposed TSPC could reduce glitch of output signal and adjust the shape of output signal. Using this new TSPC, Frequency Divider could get clearly divided output signal and low current. Also, this proposed programmable Frequency Divider using new TSPC. 4/5 synchronous dual-modulus divider is used to make Frequency Divider programmable. Proposed Frequency Divider can divide the signal 128 ~ 135 times. This programmable Frequency Divider can choose dividing ratio and can be helpful to make exact output signal of Frequency Divider in BLE application. Frequency Divider is designed for low power which use 202 μW at 1 V of input voltage.
김도연 ( Do Yeon Kim ),안현수 ( Hyun Su An ),전재욱 ( Jae Wook Jeon ) 한국정보처리학회 2020 한국정보처리학회 학술대회논문집 Vol.27 No.2
본 논문은 공학계열 학생들이 어셈블리 프로그래밍을 통해 x86 프로세서를 학습하는 교육 과정을 소개한다. 이 교육 과정은 어셈블리 프로그래밍을 통해 가상머신에서 프로그램을 실행시켜 학생들이 전공 교과 과정에서 학습한 마이크로프로세서 이론의 이해를 향상시키도록 도와준다. 작성된 어셈블리 파일은 NASM 을 이용하여 컴파일 되고, VMware 의 Workstation Player 가 컴파일러에 의해 생성된 바이너리 파일을 실행시키기 위해 사용되었다. 교육 과정은 마이크로프로세서 이론 수업에 맞추어 과제가 학생에게 주어지고, 학생들은 이론 수업의 이해를 바탕으로 결과물을 완성하고 이를 직접 시연하여 평가받았다.
김청수(Chung-Soo Kim),안현수(Hyun-Su An),이화용(Hwa-Yong Lee),정백호(Baek-Ho Jung) 호서대학교 공업기술연구소 2003 공업기술연구 논문집 Vol.22 No.1
In th is paper, we present a set of num erical schem es to solve the M u lle r integral equation for the analysis of electrom agnetic scattering from arbitrarily shaped three-dim ensional dielectric bodies by applying the m ethod of m om ents (M o M ). T he piecew ise hom ogeneous dielectric structure is approxim ated by planar trian g ular patches. A set o f the i?W G (R ao , W ilto n, G lisson) functions is used for expansion o f the equivalent electric and m agnetic current densities and a com om ation of the R W u function and its orthogonal com ponent is used for testing. N um erical results for a dielectric sphere are presented and com pared w ith solutions obtained using other form ulations.
BLE Application을 위한 55nm CMOS 공정의 저전력, 3.8-5.8 GHz Tuning Range를 갖는 LC VCO 설계
서정환(Jung-Hwan Seo),양동암(Dong-Am Yang),안현수(Hyun-Su An),박주현(Ju-Hyun Park),이강윤(Kang-Yoon Lee) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.11
In this paper, frequency CMOS Voltage Control Oscillator (VCO) which is needed in Phase Locked Loop (PLL) of Bluetooth Low Energy (BLE) is proposed. The LC oscillator architecture which is composed of PMOS, NMOS symmetrically, is designed for improving phase noise characteristic. Furthermore, resister and capacitor to current source which used PMOS are added for improving phase noise characteristic. Linearized varactor is designed to control the output voltage frequency, and for wide range of output voltage frequency, double capacitor banks which is consist of two Cap-Bank are proposed. Lastly, Output Buffer is designed for making bigger output voltage amplitude. Phase noise of designed VCO is 113.9 dBc/Hz at 1 MHz offset, and output voltage frequency range of designed VCO is 1.96 GHz which means 40.5 % of Tuning Range. We designed VCO as low power VCO which use 629.9 μW at 1 V of input voltage.
김청수,안현수,이화용,정백호 湖西大學校工業技術硏究所 2003 工業技術硏究所論文集 Vol.22 No.-
In this paper, we present a set of numerical schemes to solve the Muller integral equation for the analysis of electromagnetic scattering from arbitrarily shaped three-dimensional dielectric bodies by applying the method of moments(MoM). The piecewise homogeneous dielectric structure is approximated by planar triangular patches. A set of the RWG(Rao, Wilton, Glisson) functions is used for expansion of the equivalent electric and magnetic current densities and a combination of the RWG function and its orthogonal component is used for testing. Numerical results for a dielectric sphere are presented and compared with solutions obtained using other formulations.