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RISS 인기검색어
- 검색키워드
- 저자 : Ikguen Choi (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Effect of R-C Compensation on Switching Regulation of CMOS Low Dropout Regulator
Choi, Ikguen,Jeong, Hyeim,Yu, Junho,Kim, Namsoo The Korean Institute of Electrical and Electronic 2016 Transactions on Electrical and Electronic Material Vol.17 No.3
Miller feedback compensation is introduced in a low dropout regulator (LDO) in order to obtain a capacitor-free regulator and improve the fast transient response. The conventional LDO has a limited bandwidth because of the large-size output capacitor and parasitic gate capacitance in the power MOSFET. In order to obtain a stable frequency response without the output capacitor, LDO is designed with resistor-capacitor (R-C) compensation and this is achieved with a connection between the gain-stage and the power MOS. An R-C compensator is suggested to provide a pole and zero to improve the stability. The proposed LDO is designed with the 0.35 μm CMOS process. Simulation testing shows that the phase margin in the Bode plot indicates a stable response, which is over 100<sup>o</sup>. In the load regulation, the transient time is within 55 μs when the load current changes from 0.1 to 1 mA.
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180도 방위 빔 커버리지 특성을 갖는 UNII대역 소형 전자 빔 조향 기생 배열 안테나
최익권(Ikguen Choi),주상호(Sangho Ju) 한국산업정보학회 2010 한국산업정보학회논문지 Vol.15 No.2
본 논문에서는 180도 방위 빔 커버리지 특성을 갖는 소형의 고이득 빔 조향 기생배열 안테나를 제안한다. 이 안테나는 단일면 야기 다이폴 급전소자와 리액턴스가 장하된 인접한 두 기생 다이폴 소자로 구성되며 제작된 안테나는 기생소자의 리액턴스를 전자적으로 변화시킴으로써 UNII 대역에서 (5.725㎓~5.825㎓) 방위각 -90°에서 90°범위에서 5.2㏈~6.7㏈ 이득 특성을 가지며, 반사손실은 -10㏈이하임을 측정을 통해 확인하였다. In this papar, we have proposed a small electronically steerable parasitic array radiator with 180 degree azimuth beam coverage and high gain characteristics. The proposed antenna is composed of a uniplanar Yagi dipole as a feeding element and two dipoles as parasitic elements. The fabricated antenna is tested by electronically changing the reactance loaded on the parasitic dipoles and the results show that it has 5.2㏈~6.7㏈ gain in -90°~90° wide azimuth range and -10㏈ return loss characteristics within 5.725㎓~5.825㎓ UNII band.
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Effect of R-C Compensation on Switching Regulation of CMOS Low Dropout Regulator
Namsoo Kim,Ikguen Choi,Hyeim Jeong,Junho Yu 한국전기전자재료학회 2016 Transactions on Electrical and Electronic Material Vol.17 No.3
Miller feedback compensation is introduced in a low dropout regulator (LDO) in order to obtain a capacitor-freeregulator and improve the fast transient response. The conventional LDO has a limited bandwidth because of thelarge-size output capacitor and parasitic gate capacitance in the power MOSFET. In order to obtain a stable frequencyresponse without the output capacitor, LDO is designed with resistor-capacitor (R-C) compensation and this isachieved with a connection between the gain-stage and the power MOS. An R-C compensator is suggested to providea pole and zero to improve the stability. The proposed LDO is designed with the 0.35 μm CMOS process. Simulationtesting shows that the phase margin in the Bode plot indicates a stable response, which is over 100o. In the loadregulation, the transient time is within 55 μs when the load current changes from 0.1 to 1 mA.
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