M.Y. Park

Korea Atomic Energy Research Institute (KAERI), Daiden, Daejeon, South Korea

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Publications (22)2.39 Total impact

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    ABSTRACT: A UWB receiver with carrier that has 400 MHz cut-off frequency, 73 dB dynamic range and -70 dBm input sensitivity was generated in 0.13 um CMOS technology for applying to the both IR and MB-OFDM UWB transceiver. LNA and VGA have the broad gain variation (27 dB and 51 dB respectively) using 2 bit and 6 bit switch control. The 7th order gm-C Chebyshev LPF utilizes the modified Nauta OTA and gyrator to extend the 3 dB bandwidth to 400 MHz. Frequency synthesizer that cover both IR and MB-OFDM UWB is proposed. According to the controllable division ratio and reference frequency, the wanted channel can be selected.
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    ABSTRACT: The PEFP 20MeV proton accelerator is composed of 3 MeV RFQ and 20MeV DTL and two sets of 1 MW, 350 MHz RF system are required for each accelerating structure. The high power RF system for 3 MeV RFQ was already installed and operated to drive the RFQ. The klystron was tested up to 600 kW itself and operated in pulse routinely. The HPRF system for 20 MeV DTL which consists of 4 tanks was installed, and the RF test for 4 tanks has been carried out. Four RF dummy loads for absorbing RF power reflected from each accelerating structure were designed and manufactured. In this paper, the status and test results of the RF system for 20 MeV proton accelerator are discussed.
    Particle Accelerator Conference, 2005. PAC 2005. Proceedings of the; 06/2005
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    Y.H. Kim, H.J. Kwon, M.Y. Park, Y.S. Cho
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    ABSTRACT: Drift tubes of PEFP 20MeV DTL contain electro-quadrupole magnet composed of commercial enamel wire cooled with water coolant. Those were fabricated through the process of brazing, assembling, electron-beam welding, and post-machining. During the e-beam welding, temperature increase was kept under 50 degree to protect the EQM wire from thermal damage. We performed several tests such as vacuum leak test, hydraulic test, and electrical test. EQM properties such as effective length, magnetic saturation, and offset between magnetic center and geometric center of DT were measured and recorded also.
    Particle Accelerator Conference, 2005. PAC 2005. Proceedings of the; 06/2005
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    ABSTRACT: A 3MeV RFQ for 100MeV proton accelerator has been developed at PEFP (Proton Engineering Frontier Project). The tuning results of the cavity showed that both the frequency and field profile were beyond the tuner limit. To check the cavity characteristics, RF test including proton beam acceleration has been done. To solve the problems in existing RFQ, new RFQ so called RFQ Upgrade has been fabricated. Because the main problem of the existing one is improper tuning of the cavity, the important step for development of RFQ Upgrade is to adjust the vanes before brazing. In this paper, the test results of the existing PEFP RFQ and the pre-brazing tuning are presented.
    Particle Accelerator Conference, 2005. PAC 2005. Proceedings of the; 06/2005
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    Conference Paper: Tuning of 20MeV PEFP DTL
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    ABSTRACT: The PEFP (Proton Engineering Frontier Project) DTL which accelerate the proton beam having peak current 20 mA to 20 MeV have been constructing in KAERI site [1]. The tank resonant frequency is 350 MHz and a 1 MW klystron is used for 4 tanks. In this paper, the overall features of the PEFP DTL tuning are presented and the measurement results of the DTL tank 1 are discussed.
    Particle Accelerator Conference, 2005. PAC 2005. Proceedings of the; 06/2005
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    ABSTRACT: A conventional 20 MeV drift tube linac (DTL) for the Proton Engineering Frontier Project (PEFP) has been developed as a low energy section of 100 MeV accelerator. The machine consists of four tanks with 152 cells supplied with 900 kW RF power from 350 NMz klystron through the ridge-loaded waveguide coupler. We assembled the fabricated accelerator components and aligned each part with care. We have also prepared the subsystems for the test of the DTL such as RF power delivery system, high voltage DC power supply, vacuum system, cooling system, measurements and control system and so on. The detailed description of the initial test setup and preliminary test results will be given in this paper.
  • YH Kim, JW Park, MY Park, HK Yu
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    ABSTRACT: A fully differential dual input CMOS transconductor with high linearity and low distortion is proposed. To achieve high performance characteristics at low supply voltage, three design considerations are described from the viewpoint of a DC-offsets, linear range, and distortions. A 1.8V 10MHz fully-differential 3(rd)-order Chebyshev Gm-C low pass filter using this transconductor is designed and fabricated using a 0.18mum CMOS process. Measured results in a nominal condition (Vc=1.05V) show 11.3MHz of bandwidth, 43.7dBr of stop-band attenuation at 40MHz, 0.38dB of pass-band ripple, and 74.4dB of dynamic range. In addition, the IIP3 obtained at the optimum resistance of resistor utilized as a distortion canceller is 16.3dBm. The filter is consumes 2.34mA at 1.8V power supply.
    IEEE Custom Integrated Circuits Conference; 01/2004
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    ABSTRACT: The development of a low-energy proton accelerator has started as the first phase of the Proton Engineering Frontier Project (PEFP). The low-energy proton accelerator system consists of a 50 keV proton injector, low-energy beam transport (LEBT), 350 MHz, 3 MeV radiofrequency quadrupole (RFQ), 350 MHz, 20 MeV drift-tube linac (DTL), and RF system. The proton injector is under operation, RFQ is testing RF power, and a design of DTL has finished.
    Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the; 06/2003
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    ABSTRACT: We have designed a conventional 20 MeV drift tube linac (DTL) for the Proton Engineering Frontier Project (PEFP) as a low energy section of 100 MeV accelerator. The machine consists of four tanks with 152 cells supplied with 900 kW RF from 350 MHz klystron. We have also studied beam dynamics in this structure and designed focusing quadrupole magnets. The details of the DTL design are reported.
    Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the; 06/2003
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    ABSTRACT: The frontier project for high power proton accelerator including the proton injector, LEBT, RFQ and DTL has been launched in Sep. 2002. The fabrication and installation of the front-end system completed and the engineering design of the DTL has been ended. Now we are fabricating the 1st tank and RF components for the DTL. The purpose of this paper is to overview the installed vacuum systems of the front-end system, and to check out the designation of the DTL vacuum system.
    Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the; 06/2003
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    ABSTRACT: A prototype IF transceiver has been integrated in 0.35mum CMOS technology. The chip includes VGAs and mixers for IMT-2000. The VGAs are controlled continuously in linear dB by using a proposed quasi-exponential gain control method. Measurements show that both VGAs have over 90dB dynamic range and 9.5dB NF in receiver. The -3dB frequencies of the receiver and transmitter are 250MHz and 430MHz, respectively. Thus, the transceiver can adapt to PCS as well as IMT-2000 for potential dual-band application. With a single 3.0V power supply, the VGAs and mixers consume 16mA and 6mA, respectively.
    Symposium on VLSI Circuits; 01/2003
  • JH Chang, YS Youn, MY Park, CK Kim
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    ABSTRACT: A new fully integrated low power and low phase noise 6 GHz quadrature VCO is designed and fabricated in standard commercial 0.18 mum single-poly, 6-metal CMOS process. The one VCO-core draws only 1.6mA of current from a 1.8V supply. Total power consumption include two VCO-cores and two WO-buffers - for generating quadrature signal is 18mW. Measured phase noise at 1 MHz offset from the center frequency is -115 dBc/Hz. It has tuning range of 1.2 GHz with low phase noise performance throughout the tuning range. It meets the requirements for IEEE802.11a and HiperLAN type 2 standards. Low power and low phase noise have been achieved simultaneously by the use of new proposed cascode coupling topology.
    IEEE Radio Frequency Integrated Circuits Symposium (RFIC); 01/2003
  • SH Han, YS Youn, HK Yu, MY Park
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    ABSTRACT: A frequency synthesizer including a integrated quadrature VCO and a few novel circuits is presented in a 0.18um CMOS technology. A 16/17 dual modulus prescaler operates up to 5.1GHz due to the fast (about 10GHz) operation of the proposed complementary clocking (CC) dynamic flip-flop. Also, a phase frequency detector (PFD) utilizing the charge pump current feedback, generates low spurious tones irrespective of the temperature or supply variations. The measured reference spur is less than -120dBc with a second order loop-filter of which bandwidth equals f(REF)/50. The measured out- and in-band phase noise of the quadrature VCO is -140dBc@8MHz and -82dBc@10kHz, respectively. With a 1.8V power supply, the current consumption of the overall frequency synthesizer is only 7.5mA except 50Omega driving buffers.
    IEEE Radio Frequency Integrated Circuits Symposium (RFIC); 01/2003
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    ABSTRACT: A merged structure of variable gain LNA and sub-harmonic mixer is designed for multi-band direct conversion receiver (DCR) application with a 0.18mum CMOS process. The circuit uses inductive peaking load to increase 3dB-bandwidth and achieves 22.7similar to32dB conversion gain, 2.8similar to4.1dB DSB NF, -10.5similar to4.1dBm IIP3 and 5similar to17.3dBm IIP2 from 800MHz to 2.4GHz input range. Variable gain range is 11.5dB at 2.1GHz and typical LO to RF isolation is less than - 50dBm and DC offset voltage is less than 10mV. The overall power consumption is 17mW with 1.8V supply voltage and chip size is 2.3mmx1.2mm.
    IEEE MTT-S International Microwave Symposium; 01/2003
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    ABSTRACT: Several application programs are included in Proton Engineering Frontier Project (PEFP), which was approved by the korean government, Ministry of Science and Technology (MOST) in May 2002. For the feasibility studies of these application programs, we built a beam line at the SNU-AMS tandem accelerator.
    IEEE International Conference on Plasma Science 01/2003; DOI:10.1109/PLASMA.2003.1228764
  • H.S. Park, S.H. Kim, M.Y. Park, Y.H. Kim
    Tetrahedron Letters 05/2001; 42(22). · 2.39 Impact Factor
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    ABSTRACT: The frequency-variant characteristics of a silicon substrate were physically modeled, analytically investigated, and experimentally verified. The scalable circuit model parameter extraction methodology was newly developed. Thus, the proposed technique can provides the efficient performance evaluations as well as the accurate design guidelines concerned with the complicated mixed signal integrated circuit designs
    Microwave Symposium Digest, 2001 IEEE MTT-S International; 02/2001
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    ABSTRACT: To establish the design guide on coupling between inductor pairs, we measured the magnitude of the electromagnetic coupling between inductors with the variation of physical separation and substrate resistivity. We also found that the coupling effect degrades the reverse isolation of L-band CMOS LNAs, and analyzed several LNAs fabricated with different fabrication technology. Furthermore, we proposed inductors for preventing the coupling, and its coupling reduction effect on the LNA is demonstrated
    Microwave Symposium Digest. 2000 IEEE MTT-S International; 02/2000
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    ABSTRACT: A high power RF system for PEFP RFQ has been developed and operated. The required peak power is 535kW, and pulse width, repetition rate for initial operation are 100µs, 10Hz respectively. All of the RF components including RF window, input coupler, klystron power supply and cooling system have the capacity of operating at 535kW average power level. Therefore RF duty can be increased for higher average power operation. The TH2089F klystron was operated in pulse mode by modulating the input RF power. The RF power from the klystron was divided into two legs and delivered to RFQ. In this paper, the system description and operation results are presented.