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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 11, Issue 4 - Dec 2007
Volume 11, Issue 3 - Sep 2007
Volume 11, Issue 2 - Jun 2007
Volume 11, Issue 1 - Mar 2007
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An Integral-Augmented Nonlinear Optimal Variable Structure System for Uncertain MIMO Plants
Lee, Jung-Hoon ;
Journal of IKEEE, volume 11, issue 1, 2007, Pages 1~14
In this paper, a design of an integral augmented nonlinear optimal variable structure system(INOVSS) is presented for the prescribed output control of uncertain MIMO systems under persistent disturbances. This algorithm basically concerns removing the problems of the reaching phase and combining with the nonlinear optimal control theory. By means of an integral nonlinear sliding surface, the reaching phase is completely removed. The ideal sliding dynamics of the integral nonlinear sliding surface is obtained in the form of the nonlinear state equation and is designed by using the nonlinear optimal control theory, which means the design of the integral nonlinear sliding surface and equivalent control input. The homogeneous
form is defined in order to easily select the
higher order nonlinear terms in the suggested sliding surface. The corresponding nonlinear control input is designed in order to generate the sliding mode on the predetermined transformed new surface by means of diagonalization method. As a result, the whole sliding output from a given initial state to origin is completely guaranteed against persistent disturbances. The prediction/predetermination of output is enable. Moreover, the better performance by the nonlinear sliding surface than that of the linear sliding surface can be obtained. Through an illustrative example, the usefulness of the algorithm is shown.
Fully Integrated Design of a Low-Power 2.5GHz/0.5GHz CMOS Dual Frequency Synthesizer
Kang, Ki-Sub ; Oh, Gun-Chang ; Park, Jong-Tae ; Yu, Chong-Gun ;
Journal of IKEEE, volume 11, issue 1, 2007, Pages 15~23
This paper describes a dual frequency synthesizer designed in a 0.2
m CMOS technology for wireless LAN applications. The design is focused mainly on low-power characteristics. Power dissipation is minimized especially in VCO and prescaler design. The designed synthesizer includes all building blocks for elimination of external components, other than the crystal. Its operating frequency can be programmed by external data. It operates in the frequency range of 2.3GHz to 2.7GHz (RF) and 250MHz to 800MHz (IF) and consumes 5.14mA at 2.5GHz and 1.08mA at 0.5GHz from a 2.5V supply. The measured phase noise is -85dBc/Hz in-band and -105dBc/Hz at 1MHz offset at IF band. The die area is 1.7mm
Development of 3 Channel Biomedical Signal Measurement System for Mac-yule
Byeon, M.K. ; Kim, H.J. ; Jang, J.K. ; Han, S.W. ; Huh, W. ;
Journal of IKEEE, volume 11, issue 1, 2007, Pages 24~29
In this paper, we developed a Mac-Yule measurement system which consider psychological stable state of patience. The developed system consist with a hardware device that can derive a EEG, respiration and pulse wave, and a software which acquire a biological signal and signal processing The EEGs are derived with bipolar method from frontal head. The respiration signals obtain from nasal front with a transducer which consist with thermistor bridge. The pulse waves are detected from earlobe with photoplethysmograph method. A power spectrum of EEG are used as the decision parameters of psychological stable state of patience. The decision of Mac-Yule are defined as origin text method that of numbers of pulse to 1 respiration period. As the results of experiment with developed system, we could have a spectrum band discretion of EEG signal, stable respiration signal detection and automatic gain controlled pulse signal with realtime. And then, we could detect Mac-Yules from processed signals.
A Detection Method of Position of ON/OFF-Switch
Cho, Byung-Mo ; Lee, Kwon-Yeon ; Son, Myung-Sik ;
Journal of IKEEE, volume 11, issue 1, 2007, Pages 30~37
This paper proposes a detection method of position of OFF-switch. Each switch has the parallel path with a serial combination of passive element, its parallel path has each different frequency characteristics. Frequency characteristic of ON-switch reveals a flat spectrum irrelevant to frequency characteristic of passive element connected in parallel to its each terminal and frequency characteristic of OFF-switch reveals the same characteristic as one of passive element connected in parallel. Detection of position of OFF-switch is done by measuring the similarity of each spectrum corresponding to frequency characteristic of passive element connected in parallel to OFF-switch. The measure of their similarity is to calculate Euclidean distance between their test spectrum and reference spectrum. The spectrum with the smallest distance among reference spectrum is recognized as the spectrum of OFF-switch. The real time digital signal processing system is implemented to detect the position of OFF-switch by using spectrum matching.
A 8-bit Variable Gain Single-slope ADC for CMOS Image Sensor
Park, Soo-Yang ; Son, Sang-Hee ; Chung, Won-Sup ;
Journal of IKEEE, volume 11, issue 1, 2007, Pages 38~45
A new 8-bit single-slope ADC using analog RAMP generator with digitally controllable dynamic range has been proposed and simulated for column level or per-pixel CMOS image sensor application. The conversion gain of ADC can he controlled easily by using frequency divider with digitally controllable diviber ratio, coarse/fine RAMP with class-AB op-amp, resistor strings, decoder, comparator, and etc. The chip area and power consumption can be decreased by simplified analog circuits and passive components. Proposed frequency divider has been implemented and verified with 0.65um, 2-poly, 2-metal standard CMOS process. And the functional verification has been simulated and accomplished in a 0.35
m standard CMOS process.
Design Characteristics of Permanent Magnet Linear Synchronous Motor for Short Reciprocating Trajectory
Jung, Sang-Yong ;
Journal of IKEEE, volume 11, issue 1, 2007, Pages 46~53
Design characteristics of PMLSM(Permanent Magnet Linear Synchronous Motor) considering the dynamic running condition under the limited input voltage and current for short reciprocating trajectory are presented. Particularly, the dynamic constraints resulted from the dynamic capability of PMLSM and the required motional performance of the repeated short stroke are applied to determine the design specification of PMLSM. In addition, optimal design flow based on the dynamic constraints is specified with the design parameters, such as coil resistances, the EMF constants, inductances, pole-pitch. Furthermore, proposed methods and results are validated by the experimental ones measured with the purpose-built prototype.
The novel NPLVTSCR ESD ProtectionCircuit without Latch-up Phenomenon for High-Speed I/O Interface
Koo, Yong-Seo ;
Journal of IKEEE, volume 11, issue 1, 2007, Pages 54~60
In this study novel ESD protection device, namely, N/P-type Low Voltage Triggered SCR, has been proposed, for high speed I/O interface. Proposed device could lower high trigger voltage(
20V) of conventional SCR and reduce latch-up phenomenon of protection device during the normal condition. In this Study, the proposed NPLVTSCR has been simulated using TMA MEDICI device simulator for electrical characteristic. Also the proposed device's test pattern was fabricated using 90nm TSMC's CMOS process and was measured electrical characteristic and robustness. In the result, NPLVTSCR has 3.2V
7.5V trigger voltage and 2.3V
3.2V holding voltage by changing PMOS gate length and it has about 2kV, 7.5A HBM ESD robustness(IEC61000-4-2).
Novel Polarization Condition of Optical Polarized Beamsplitter with Misaligned Input Interface and Guiding Loss
Ho, Kwang-Chun ;
Journal of IKEEE, volume 11, issue 1, 2007, Pages 61~68
Using modal transmission-line theory (MTLT), itexplores rigorously the polarization characteristics of TE-TM mode optical polarized beamsplitter with misaligned input interface. To verify the validity of the approach proposed in this paper, a novel polarization condition is defined, and it compares and evaluates with the polarization condition of coupled-mode theory (CMT) used widely. The numerical results reveal that the discontinuity of misaligned input interface has nothing to do with the polarization condition of beamsplitter. Furthermore, the condition of CMT is no longer effective at the asymmetric guiding structures with strong power coupling.
The Design of CMOS-based High Speed-Low Power BiCMOS LVDS Transmitter
Koo, Yong-Seo ; Lee, Jae-Hyun ;
Journal of IKEEE, volume 11, issue 1, 2007, Pages 69~76
This paper presents the design of LVDS (Low-Voltage-Differential-Signaling) transmitter for Gb/s-per-pin operation. The proposed LVDS transmitter is designed using BiCMOS technology, which can be compatible with CMOS technology. To reduce chip area and enhance the robustness of LVDS transmitter, the MOS switches of transmitter are replaced with lateral bipolar transistor. The common emitter current gain(
) of designed bipolar transistor is 20 and the cell size of LVDS transmitter is
. Also the proposed LVDS driver is operated at 1.8V and the maximum data rate is 2.8Gb/s approximately In addition, a novel ESD protection circuit is designed to protect the ESD phenomenon. This structure has low latch-up phenomenon by using turn on/off character of P-channel MOSFET and low triggering voltage by N-channel MOSFET in the SCR structure. The triggering voltage and holding voltage are simulated to 2.2V, 1.1V respectively.