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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of IKEEE
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Journal DOI :
Institude of Korean Electrical and Electronics Engineers
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Volume & Issues
Volume 15, Issue 4 - Dec 2011
Volume 15, Issue 3 - Sep 2011
Volume 15, Issue 2 - Jun 2011
Volume 15, Issue 1 - Mar 2011
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Fast Auxiliary Channel Design for Display Port
Jin, Hyun-Bae ; Moon, Yong-Hwan ; Jang, Ji-Hoon ; Kim, Tae-Ho ; Song, Byung-Cheol ; Kang, Jin-Ku ;
Journal of IKEEE, volume 15, issue 2, 2011, Pages 113~121
This paper presents the design of a fast auxiliary channel bus for DisplayPort 1.2 interface. The fast auxiliary channel supports Manchester transactions at 1Mbps and fast auxiliary transactions at 780Mbps. The Manchester transaction is used for managing the main link and auxiliary channel and the fast auxiliary transaction is for data transfer via the auxiliary channel. Simplified serial bus architecture is proposed to be implemented in fast auxiliary channel. The fast auxiliary channel transmitter and receiver are implemented with 7,648 LUTs and 6,020 slice register synthesized in Xilinx Vertex4 FPGA and can be operated at 72MHz to support 720Mbps.
An Embedded FPGA Implementation for a Cameralink Interface
Lee, Chang-Su ;
Journal of IKEEE, volume 15, issue 2, 2011, Pages 122~128
Although conventional analog linescan cameras are used widely, high-speed, high-resolution Cameralink standard will lead the area of frame grabber industry such as factory automation. In this paper, we are developing embedded frame grabber testbed without PC which will give an another solution to image processing applications. Therefore, we designed hardware schematics and programmed FPGA device with VHDL in order to interface Cameralink standard linescan CCD camera. In the future, our embedded on-chip controller could be applied to various image processing systems such as medical imaging, especially optical coherence tomography, machine vision and industrial electronics.
A Spread Spectrum Clock Generator for SATA II with Rounded Hershey-Kiss Modulation Profile
Moon, Yong-Hwan ; Lim, Wan-Sik ; Kim, Tae-Ho ; Kang, Jin-Ku ;
Journal of IKEEE, volume 15, issue 2, 2011, Pages 129~133
A spread spectrum clock generation is an efficient way to reduce electro-magnetic interference (EMI) radiation in modern mixed signal chip systems. The proposed circuit generates the spread spectrum clock by directly injecting the modulation voltage into the voltage-controlled oscillator (VCO) current source for SATA II. The resulting 33KHz modulation profile has a Hersey-Kiss shape with a rounded peak. The chip has been fabricated using
CMOS process and test results show that the proposed circuit achieves 0.509% (5090ppm) down spreading at 1.5GHz and peak power reduction of 10dB. The active chip area is 0.36mm
0.49mm and the chip consumes 30mW power at 1.5GHz.
Design of a Tripple-Mode DC-DC Buck Converter
Yu, Seong-Mok ; Park, Joon-Ho ; Park, Jong-Tae ; Yu, Chong-Gun ;
Journal of IKEEE, volume 15, issue 2, 2011, Pages 134~142
This paper describes a tripple-mode high-efficiency DC-DC buck converter. The DC-DC buck converter operate in PWM(Pulse Width Modulation) mode at moderate to heavy loads(100mA~500mA), in PFM(Pulse Frequency Modulation)at light loads(1mA~100mA), and in LDO(Low Drop Out) mode at the sleep mode(<1mA). In PFM mode DPSS(Dynamic Partial Shutdown Strategy) is also employed to increase the efficiency at light loads. The triple-mode converter can thus achieve high efficiencies over wide load current range. The proposed DC-DC converter is designed in a CMOS 0.18um technology. It has a maximum power efficiency of 96.4% and maximum output current of 500mA. The input and output voltages are 3.3V and 2.5V, respectively. The chip size is 1.15mm
1.10mm including pads.
A Methodology of Dual Gate MOSFET Dosimeter with Compensated Temperature Sensitivity
Lho, Young-Hwan ;
Journal of IKEEE, volume 15, issue 2, 2011, Pages 143~148
MOS (Metal-Oxide Semconductor) devices among the most sensistive of all semiconductors to radiation, in particular ionizing radiation, showing much change even after a relatively low dose. The necessity of a radiation dosimeter robust enough for the working environment has increased in the fields of aerospace, radio-therapy, atomic power plant facilities, and other places where radiation exists. The power MOSFET (Metal-Oxide Semiconductor Field-Effect Transistor) has been tested for use as a gamma radiation dosimeter by measuring the variation of threshold voltage based on the quantity of dose, and a maximum total dose of 30 krad exposed to a
-radiation source, which is sensitive to environment parameters such as temperature. The gate oxide structures give the main influence on the changes in the electrical characteristics affected by irradiation. The variation of threshold voltage on the operating temperature has caused errors, and needs calibration. These effects can be overcome by adjusting gate oxide thickness and implanting impurity at the surface of well region in MOSFET.
A New Robust Digital Sliding Mode Control with Disturbance Observer for Uncertain Discrete Time Systems
Lee, Jung-Hoon ;
Journal of IKEEE, volume 15, issue 2, 2011, Pages 149~156
In this paper, a new discrete variable structure controller based on a new sliding surface and discrete version of the disturbance observer is suggested for the control of uncertain linear systems. The reaching phase is completely removed by introducing a new proposed sliding surface. The discrete version of the disturbance observer is derived for the effective compensation of the effect of uncertainties and disturbances. A corresponding control input with the disturbance compensation is selected to guarantee the quasi sliding mode on the predetermined sliding surface for guaranteeing the designed output in the sliding surface from any initial condition to the origin for all the parameter variations and disturbances. By using Lyapunov function, the closed loop stability and the existence condition of the quasi sliding mode is proved. Finally, an illustrative example is presented to show the effectiveness of the algorithm.
Traffic Grooming Algorithm for Maximizing Throughput in WDM Multi-Ring Networks
Yoon, Seung-Jin ; Lim, Chul-Soo ;
Journal of IKEEE, volume 15, issue 2, 2011, Pages 157~163
In this paper, novel traffic groomming algorithms are proposed with a primary goal for maximizing throughput in WDM Multi-ring networks. To achieve this goal, we design four network topologys that are ITG, STG, MTG, PMTG and simulate the throughput in uniform traffic environments. From this methods, we proposed novel traffic groomming algorithms to maximize throughput in WDM Multi-ring networks.
Analysis of The Dual-Emitter LIGBT with Low Forward Voltage Loss and High Lacth-up Characteristics
Jung, Jin-Woo ; Lee, Byung-Seok ; Park, San-Cho ; Koo, Yong-Seo ;
Journal of IKEEE, volume 15, issue 2, 2011, Pages 164~170
In this paper, we present a novel Lateral Insulated-Gate Bipolar Transistor(LIGBT) structure. The proposed structure has extra emitter between emitter and collector of the conventional structure. The added emitter can significantly improve latch-up current densities, forward voltage drop (Vce,sat) and turn-off characteristics. From the simulation results, the proposed LIGBT has the lower forward voltage drop(1.05V), the higher latch-up current densities(
), and the shorter turn-off time(7.4us) than those of the conventional LIGBT.
Jittered Pulse Repetition Interval Coder Based on M-sequence Codes for Counter-Countermeasure of a Radar
Pyo, Sun-Oh ; Seo, Dong-Sun ; Jo, Jun-Yong ; Lee, Jae-Cheol ;
Journal of IKEEE, volume 15, issue 2, 2011, Pages 171~178
In this paper, a novel pulse repetition interval (PRI) jittering coder based on quasi-random M-sequence codes is proposed for improvement of counter-countermeasure capability in a radar. Each of the proposed jittered 256 PRI codes has a unique code chip combination with 256 code chips, such that any set of three consequent code chips (4 pulses) from any code appears only once among the entire code chip sequences of the codes. This indicates that only 4 of received pulses are enough to determine uniquely the exact timing position of the incoming pulse train (or code chip sequence) required for counter-countermeasure, as well as the identity of the transmitted code. To prove the proposed idea experimentally, the jittered PRI coder is implemented and demonstrated.
SVC Based Multi-channel Transmission of High Definition Multimedia and Its Improved Service Efficiency
Kim, Dong-Hwan ; Cho, Min-Kyu ; Moon, Seong-Pil ; Lee, Jae-Yeal ; Jun, Jun-Gil ; Chang, Tae-Gyu ;
Journal of IKEEE, volume 15, issue 2, 2011, Pages 179~189
This paper presents an SVC based multi-channel transmission technique. Transmission of high definition multimedia and its service efficiency can be significantly improved by the proposed method. In this method, the HD stream is divided into the two layer streams, i.e., a base layer stream and an enhancement layer stream. The divided streams are transmitted through a primary channel and an auxiliary channel, respectively. The proposed technique provides a noble mode switching technique which enables a seamless service of HD multimedia even under the conditions of abrupt and intermittent deterioration of the auxiliary channel. When the enhancement layer stream is disrupted by the channel monitoring in the mode switching algorithm, the algorithm works further to maintain the spatial and time resolution of the HD multimedia by upsampling and interpolating the base layer stream, consequently serving for the non disrupted play of the media. Moreover, the adoption of an adaptive switching algorithm significantly reduces the frequency of channel disruption avoiding the unnecessary switching for the short period variations of the channel. The feasibility of the proposed technique is verified through the simulation study with an example application to the simultaneous utilization of both Ku and Ka bands for HD multimedia broadcasting service. The rainfall modeling and the analysis of the satellite channel attenuation characteristics are performed to simulate the quality of service performance of the proposed HD broadcasting method. The simulation results obtained under a relatively poor channel (weather) situations show that the average lasting period of enhancement layer service is extended from 9.48[min] to 23.12[min] and the average switching frequency is reduced from 3.84[times/hour] to 1.68[times/hour]. It is verified in the satellite example that the proposed SVC based transmission technique best utilizes the Ka band channel for the service of HD broadcasting, although it is characterized by its inherent weather related poor reliability causing severe limitations in its independent application.