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The 23rd International Technical Conference on Circuits/Systems, Computers and Communications

Session H6  Power Electronics & Circuits 1
Time: 9:00 - 10:12 Wednesday, July 9, 2008
Location: 8F 805 Room
Chairs: Apinunt Thanachayanont (King Mongkut's Institute of Technology, Thailand), Fujihiko Matsumoto (National Defence Academy of Japan, Japan)

H6-1 (Time: 9:00 - 9:18)
TitleMaximum Output Power of Class E Amplifier for a Given Transistor, Operating Frequency, and DC Supply Voltage
Author*Takeshi Yasukouchi, Tadashi Suetsugu (Fukuoka University, Japan)
Pagepp. 981 - 984
KeywordClass E amplifier, MOSFET, maximum power
AbstractThis paper analyzes maximum output power of class E amplifier with arbitrary transistor. It is important to estimate maximum output power of class E amplifier when a specification of transistor is given. In this paper, values of circuit parameters that gives maximum output power for given operating frequency, dc supply voltage, and output capacitance of the transistor are calculated. This paper presents scheme to calculate circuit parameters that maximum output power in this condition. Finally, some example calculations are shown when this scheme was applied to some actual power MOSFET transistors.

H6-2 (Time: 9:18 - 9:36)
TitleAn Inductor-Type Current-Mode Buck Converter For Mobile Applications
Author*Youngkook Ahn, Donghun Heo, Hyunseok Nam, Jeongjin Roh (Hanyang University, Republic of Korea)
Pagepp. 985 - 988
KeywordDC-DC converter, buck converter
AbstractAn inductor-type current-mode DC-DC buck converter was evaluated through HSPICE simulation with 0.18um CMOS process parameters. The current programmed mode (CPM) controller is designed for improved controllability of the DC-DC converter. A DC-DC buck converter is able to operate from 2.5V to 3.3V supply voltage. Overall peak efficiency is about 92%.

H6-3 (Time: 9:36 - 9:54)
TitleA Low Power Analog to Digital Interface for Digitally Controlled DC-DC Converter
Author*Dong Han (Institute of Microelectronics, Singapore), Liansoon Ng, YH, Yvonne Lam (Nanyang Technological University, Singapore)
Pagepp. 989 - 992
KeywordDC-DC Converter, Digitally Controlled
AbstractThis paper presents a novel low power analog to digital interface (ADI) for digitally controlled DC-DC Converter. The whole ADI has been implemented in commercial 0.18 µm CMOS process design kit. Simulation results validate the design concept. The proposed ADI consumes 7.5 µA current under 1 V supply voltage with 500 KHz sampling rate and 4-bit resolution. It is very suitable for digitally controlled pulse width modulation (PWM) mode DC-DC converter.

H6-5 (Time: 9:54 - 10:12)
TitleMinimization of Power Consumption for the Monitoring of Mobile-WiMAX Service Coverage in DBDM Handsets
AuthorChangmin Lee, *Youngcheol Park (School of Electronics and Information Engineering Hankuk University of Foreign Studies, Republic of Korea)
Pagepp. 993 - 996
KeywordWiMAX, DBDM , Detector , Power consumption
AbstractThis paper presents a wideband active detector to scan the mobile WiMAX(mWiMAX) service area when a mWiMAX+cellular DBDM terminal is out of the mWiMAX coverage. The device, which consists of a wideband LNA and an envelope detector to minimize the power consumption for the scanning of signal existence, is designed to detect 10MHz of mWiMAX signal at 2.35GHz with the gain of 10~11dB. Measurement result shows 30~60mW of power consumption over the input power of -50 dBm~ 0 dBm, which is significantly lower power consumption compared to the case of conventional reception with full demodulation of mWiMAX signal.