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고주파 Voltage Controlled Oscillator 설계와 이를 응용한 Phase Locked Loop 설계
진태,박수양,손상희 청주대학교 산업과학연구소 1998 産業科學硏究 Vol.15 No.3
Phase Locked Loop is designed and integrated with high frequency Voltage Controlled Oscillator using LG 0.6㎛ 1-poly e-metal CMOS process. The VCO is designed without extra capacitor process which oscillates at high frequency using parasitic capacitors(gate capacitor). Phase Frequency Detector, a block of PLL, is designed with the fewest number of transistors that have ever published in papers to reduce delay caused by parasitic components in high frequency. Oscillation frequency of designed VCO is 1.1GHz at Vc=[V] and operation frequency ranges of the designed PLL is 900MHz~1GHz as results of post layout simulation. Twenty sample chips of VCD and PLL are measured with HP 8590 spectrum analyzer and HP 54542A digital oscilloscope. The error of VCO between measured results and results of post layout simulation is about 15% and PLL is about 20%.
1.5[V] 전원전압을 가지는 저전압·저전력 전압제어발진기 설계
진태,전동환,손상희 청주대학교 산업과학연구소 1998 産業科學硏究 Vol.16 No.-
In this paper, low voltage and low power Voltage Controlled Oscillator(VCO) with 1.5[V] supply voltage is designed using LG semicon 0.6μm CMOS parameter. In general CMOS circuits, threshold voltage(V_(T)) and saturation voltage(V_(DS,sat) of transistor are not scaled down compare to scaling down of supply voltage. To overcome these limitations, new biasing circuit which is not operating in saturation region but operating in linear region, is designed. The designed VCO operates in control voltage of 0.85~l.25[V] with frequency linearity. It has about 500 [μW] power dissipation and the gain of 547.84[MHz/V] by HSPICE simulation. The designed VCO is in fabrication.
동일체적을 갖는 선형 탄성기둥의 좌굴하중 및 후좌굴거동
진태기,이병구 圓光大學校大學院 1997 論文集 Vol.19 No.-
The main purpose of this paper is to investigate both the buckling loads and Vpostbuckling behavior of linearly elastic columns with constant volume. The differential equation governing the free vibrations of such column subjected to an axial load is derived and solved numerically. The nonlinear differential equations for the post-buckling behavior of such column are derived, independently of free vibration problem, and solved numerically. Numerical results are presented for simply supported columns with three types of taper. The variations of frequency parameters with section ratio and dimensionless load are reported and the buckling loads are determined by the dynamic concept. The equilibrium paLhs and elastica are presented in figures. And the buckling loads are calculated by the static concept. The buckling loads computed separately agree with each other. The variations of buckling load parameters with section ratios are presented, and the configurations of strongest column for each taper type are determined. It is found that the buckling loads of strongest columns with parabolic/sinusoidal/linear taper type are by 24.4 to 30 percent larger than that-of a uniform column.