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Sunbo Shim,Songcheol Hong IEEE 2011 IEEE transactions on microwave theory and techniqu Vol.59 No.11
<P>A CMOS power amplifier (PA) with a compact spiral-shaped directional coupler for a mobile UHF RF identification (RFID) reader is proposed here, and its output power combiner and the directional coupler are implemented using an integrated passive device process. The two-chip solution not only enables a CMOS PA to be highly efficient, but also allows the directional coupler and the power combiner to be mounted in a compact standard package. A polar transmitter is implemented using the CMOS PA with the directional coupler to verify the operation of the proposed configuration for a UHF RFID reader. Measurements indicate that the CMOS PA with the directional coupler transmits 27.3 dBm of output with 44.6% of power-added efficiency and that the implemented polar transmitter satisfies the required UHF RFID reader specifications.</P>
CMOS RF Power Amplifier for UHF Stationary RFID Reader
Taehwan Joo,Hongtak Lee,Sunbo Shim,Songcheol Hong IEEE 2010 IEEE microwave and wireless components letters Vol.20 No.2
<P>A CMOS power amplifier (PA) for a UHF (860-960 MHz) stationary RFID reader is presented. To design a high power and power efficient CMOS PA, quasi four pair structure and integrated passive device (IPD) transformers are used. An amplitude modulation is performed through the cascode gate with a pulse shaping filter. The chips are fabricated in a 0.18 ¿m CMOS process and IPD. Measurements show output power of 32.8-33.37 dBm and the power added efficiency (PAE) of 51.8-56.1% with the supply voltage 3.0 V.</P>
원자력발전소 열교환기 튜브의 비파괴검사를 위한 제4세대 와전류탐상법
이진이(Jinyi Lee),심순보(Sunbo Shim),김세진(Sejin Kim) 한국비파괴검사학회 2018 한국비파괴검사학회지 Vol.38 No.4
본 논문은 제1세대 ECT(보빈프로브)의 제한적 정량평가, 제2세대 ECT(MRPC, motorized rotation pancake coil)의 검사속도 제약, 제3세대 ECT(X-probe)의 공간분해능 저하 등에 대한 해결책으로 제4세대 ECT를 제안한다. 제4세 ECT는 시험편에 시변자계를 인가하여 결함 주변에서 발생하는 유도된 전류밀도의 변화에 의한 자속밀도분포의 변화를 환형 및 실린더형으로 조밀하게 배열된 홀센서에 의하여 측정한다. 개발된 자기카메라를 이용하여 원자력발전소 증기발생기에 적용되는 Inconel 690 튜브에 도입한 여러 가지 형태의 인공결함을 검출하여 성능을 검증하였다. This paper proposes the 4th generation Eddy-current test (ECT) method, which provides solutions to the limitations of previous versions, i.e., limited quantitative evaluation ability of the 1st generation ECT (bobbin probe), limited scanning speed in the 2nd generation ECT (MRPC, motorized rotation pancake coil), and limited spatial resolution in the 3rd generation ECT (X-probe) methods. The 4th generation ECT measures the distribution of magnetic flux density due to the distorted induced current density around a flaw using the bobbin-type and cylinder-type integrated Hall sensor array after applying a time varying magnetic field to the specimen. The magnetic camera thus developed was verified for performance by detecting various types of artificial flaws in the Inconel 690 tube, which is used in nuclear power plants as a steam generator heat exchanger.