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최평,석병석 경북대학교 전자기술연구소 1994 電子技術硏究誌 Vol.15 No.1
Multi-function pulse width modulation IC for SMPS is introduced and designed with CMOS. It consists of 5 major circuit blocks such as PWM generator, sawtooth wave generator, voltage reference circuit, overvoltage/undervoltage protection circuit, and digital circuit ections. It also has 9 control terminals(dead time control, output control, reference control, feed forward, shut down, external sync, over current protection, over voltage protection, under voltage protection)to limit or to improve its performance. Total power dissipation of proposed PWM IC is less than 50㎽ and maximum switching frequency is about 50㎒. To verify the function of designed CMOS PWM IC, SPICE simulator is used and layout is done by means of MyCAD.
최평,배호문 경북대학교 전자기술연구소 1992 電子技術硏究誌 Vol.13 No.1
The purpose of this research is development of a novel design methodology for analog VLSL Programmable analog cells and functional block diagram of a system are basic tools for the design technique. The programmable analog cells are developed using the double MOSFET-C technology. The element values and gain of each programmable cell are a function of gate voltage supplied from the outside. The functional block diagram of linear system can be created by means of the feedback theory, Mason's gain formula, system transfer function, etc. For the application of the established design method, a 2nd-order Chebyshev low pass filter is designed and simulated through PSpice.