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Low-Power, All Digital Phase-Locked Loop with a Wide-Range, High Resolution TDC
YoungGun Pu,AnSoo Park,Joon-Sung Park,이강윤 한국전자통신연구원 2011 ETRI Journal Vol.33 No.3
In this paper, we propose a low-power all-digital phase-locked loop (ADPLL) with a wide input range and a high resolution time-to-digital converter (TDC). The resolution of the proposed TDC is improved by using a phase-interpolator and the time amplifier. The phase noise of the proposed ADPLL is improved by using a fine resolution digitally controlled oscillator (DCO) with an active inductor. In order to control the frequency of the DCO, the transconductance of the active inductor is tuned digitally. The die area of the ADPLL is 0.8 mm2 using 0.13 μm CMOS technology. The frequency resolution of the TDC is 1 ps. The DCO tuning range is 58% at 2.4 GHz and the effective DCO frequency resolution is 0.14 kHz. The phase noise of the ADPLL output at 2.4 GHz is –120.5 dBc/Hz with a 1 MHz offset. The total power consumption of the ADPLL is 12 mW from a 1.2 V supply voltage.
YoungGun Pu,Jun-Gi Jo,Changsik Yoo,Dojin Park,Seong-Eon Park,Suk-Joong Lee,Kang-Yoon Lee 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
This paper presents a low power CMOS frequency synthesizer for GPS application that can support multiple reference clocks. The frequency synthesizer has fractional-N phase locked loop structure with sigma-delta modulator to allow multiple reference clock frequencies. The measured phase noise is -126㏈c/㎐ at 1㎒ offset from the carrier. This chip is fabricated with 0.18㎛ CMOS technology, and the die area of the frequency synthesizer is 1.1㎜ × 1.05㎜. The power consumption is 18㎽ at 1.8V supply voltage.
LS-DYNA를 이용한 차량방호울타리 단부처리 시설의 개발
Younggun IN,Kwanghee Shin,Kihun Bae 한국재난정보학회 2016 한국재난정보학회 논문집 Vol.12 No.3
차량방호울타리는 교통사고 발생 시 마지막 안전장치이다. 차량방호울타리의 구조적 성능 이 기대 수준 이상으로 유지가 되어야지만 운전자 혹은 차량 탑승자의 생명을 보호해 줄 수 있게 된다. 단부처리시설은 방호울타리의 끝단에 설치되며 차량 충돌 시 가드레일이 차 량에 관통하는 현상을 방지함과 동시에 충격을 흡수하는 형태의 시설물이다. 이러한 차량 방호울타리의 개발을 위하여 컴퓨터 시뮬레이션을 통한 반복해석을 수행함으로서 다양한 변수에 적절히 대응하는 방호울타리를 개발할 수 있을 것이다. Road sides safety barrier system is the last safety during traffic accident. The structural performance of a roadside safety barrier should be kept above expectations. It is possible to protect the passenger's life. End treatment part is installed in the end of the barrier it prevents a phenomenon in which for the vehicle for the guardrail during a vehicle collision it is facility of the absorbing of car crashed impact. By repeated analysis through computer simulation for improving the vehicle crash it will be able to develop crash barriers to respond appropriately to various parameters.