• Title/Summary/Keyword: 혼 설계

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A Design of Predistortion Linearizer using 2nd Low Frequency Intermodulation Signal Injection (2차 저주파 혼변조 신호 주입을 이용한 전치 왜곡 선형 화기 설계)

  • Lee, Hyo-A;Lee, Chul-Whan;Jeong, Yong-Chae;Kim, Young;Kim, Chul-Dong
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.14 no.9
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    • pp.967-973
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    • 2003

  • This paper presents a new predistortion method which injects the 2nd low-frequency intermodulation signal of RF signals into the input bias line of the amplifier. New 2nd intermodulation signal extraction circuit is also proposed. We have shown that this method can suppress the 3rd IM apparently and sometimes do the 5th IM, through mathematical analysis, then confirmed it with simulation and verified it on the desk test. When the input signal CDMA IS-95 lFA is applied, measured ACPR improvements are 25 dBc, 22.5 dBc, and 6 dBc at 0.885 MHz, l.25 MHz and 2.25 MHz offset respectively. Also, when applying the CDMA IS-95 3FA, the measured ACPR improvement is 20 dBc at 0.885 MHz offset.

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Implementation of Intelligent Measurement System of InterModulation Distorted RF Signals (지능형 누설왜곡전파신호 측정시스템 개발)

  • Kim, Dong-hyeon;Seo, Na-Hyeon;Park, Ki-Won;Rhee, Young-Chul
    • Journal of the Korean Institute of Intelligent Systems
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    • v.27 no.2
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    • pp.144-149
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    • 2017

  • In this paper, we developed an intelligent and wideband RF-receiver module to represent a high dynamic range and good linearity characteristics up to 650MHz-2700MHz frequency band. and implemented an intelligent digital-RF- distorted signal measuring system for the RF distortion (intermodulation) signals. Broadband RF-receive module was designed to represent the optimized linear parameters of the receiver to meet the low noise and wide dynamic range. The designed intelligent digital-distortion(intermodulation) signal measument system measured by applying the 1MHz IF of third intermodulation signal of DUT and Measured data was recorded by program on the PC monitor with GUI interface. By variable up to 650MHz-2700MHz measured data showed up to -127.8dBc to -138dBc of the distortion (intermodulation) signal. And developed intelligent digital- distortion signal measurement system can be used to measure intermodulation distortion signal of wireless system widely.

  • https://doi.org/10.5391/JKIIS.2017.27.2.144 인용 PDF KSCI

Computer Aided Design for Internal Mixer (컴퓨터를 이용한 internal 혼합기의 설계)

  • 김진국
    • The Korean Journal of Rheology
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    • v.2 no.2
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    • pp.28-34
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    • 1990

  • 최근 고분자 산업의 발달과 함께 고분자 혼합공정에 대한연구와 더불어 internal 혼 합기에 대한 관심이 고조되어 왔다. 본문에서는 효율적인 로우터 고안을 위하여 수학적 모 델을 이용하는 computer aided design을 다루었다. Computer aided design 하기 위하여 고 려된 인자는 유변학적 성질, 작업조건, 로우터의 형상이었으며 고안된 혼합기의 평가는 로우 터 날에서의 응력과 순환시간을 사용하였다.

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