• Title/Summary/Keyword: mixer

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A Single Transistor-Level Direct-Conversion Mixer for Low-Voltage Low-Power Multi-band Radios

  • Choi, Byoung-Gun;Hyun, Seok-Bong;Tak, Geum-Young;Lee, Hee-Tae;Park, Seong-Su;Park, Chul-Soon
    • ETRI Journal
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    • v.27 no.5
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    • pp.579-584
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    • 2005
  • A CMOS direct-conversion mixer with a single transistor-level topology is proposed in this paper. Since the single transistor-level topology needs smaller supply voltage than the conventional Gilbert-cell topology, the proposed mixer structure is suitable for a low power and highly integrated RF system-on-a-chip (SoC). The proposed direct-conversion mixer is designed for the multi-band ultra-wideband (UWB) system covering from 3 to 7 GHz. The conversion gain and input P1dB of the mixer are about 3 dB and -10 dBm, respectively, with multi-band RF signals. The mixer consumes 4.3 mA under a 1.8 V supply voltage.

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The study of three dimentional flow field using defocusing method in micromixer (Defocusing 기법을 이용한 마이크로 믹서내의 3 차원 유동장 측정연구)

  • Kim, Su-Heon;Yoon, Sang-Youl;Kim, Kyung-Chun
    • 한국가시화정보학회:학술대회논문집
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    • 2005.12a
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    • pp.99-102
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    • 2005
  • This study was conducted for obtaining the optimized data to build the mixer or micro fluid device as measuring the three dimensions flow field in micro mixer. To acquire the rapid diffusion on the region of low Reynolds (Re < 100), the staggered herringbone mixer using chaotic advection was selected in this case. At first, by conducting the numerical analytical virtual experiment using CFD-ACE+, three dimensions flow field in the micro mixer was estimated As this flow field was proven using defocusing particle tracing method, the behavior of micro flow with three dimensional aspects could be analyzed. Numerical analysis and flow pattern in the micro mixer by experimental verification made to be able to analyze the chaotic advection. These can be important sources for building more optimized form. Verifying the information of three dimensional flow structure, these information can be used as the data for developing and improving the $\mu$ -TAS.

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Design of a LNA-Mixer for 2.45GHz RFID Reader (2.45GHz 대역 RFID Reader 를 위한 LNA -Mixer 설계)

  • Lim, Tae-Seo;Ko, Jae-Hyeong;Kim, Hyeong-Seok
    • 한국정보통신설비학회:학술대회논문집
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    • 2007.08a
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    • pp.415-418
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    • 2007
  • This paper presents the design and analysis of LNA-Mixer for 2.45GHz RFID reader. The LNA is implemented by PCSNIM method for low power consumption. The Mixer is implemented by using the Gilbert-type configuration, current bleeding technique, and the resonating technique for the tail capacitance. The connection between the two designed circuits is made by active balun. This LNA-Mixer has about 35dB for -40dBm input RF power, LO power is 0dBm and RF frequency is 2.45 GHz and IIP3 is -4dBm. The layout of LNA-Mixer for one-chip design in a $0.18-{\mu}m$ TSMC process has 2.6mm ${\times}$ 1.3mm size.

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TRANSIENT FLOW SIMULATION OF A MIXER WITH FREE SURFACE (자유표면을 고려한 교반기 내부의 비정상 유동해석)

  • Ahn, Ick-Jin;Song, Ae-Kyung;Hur, Nahm-Keon
    • Journal of computational fluids engineering
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    • v.11 no.4 s.35
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    • pp.9-13
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    • 2006
  • In the present study, a numerical analysis of transient mixer flow is performed considering free surface formation. The flow patterns and free surface shape in a mixers formed by flat paddle and pitched paddle impellers are predicted. In a flat paddle mixer, two flow circulation regions are formed due to strong radial flow, whereas one large circulation is formed in a pitched paddle mixer due to axial downward flow. These differences affect the free surface evolution and shape. It is seen from the results that a flat paddle mixer gives deeper free surface at center region than a pitched paddle mixer. The free surface of 8-blades-flat-paddle mixer is also simulated to compare with the available experimental and simulation results. The present computational results agree reasonably well with the experimental data.

Ka-band high-$T_c$ superconductor and III-V semiconductor hybrid balanced mixer

  • Kwak, M.H.;Suh, J.D.;Kang, Kwang-Yong;Han, S.K.
    • 한국초전도학회:학술대회논문집
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    • v.10
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    • pp.15-20
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    • 2000
  • We demonstrated a single balanced mixer of the combination of high-T. superconductor (HTS) and III-V GaAs beam lead Schottky diodes operating in the mini-cryogenic chamber. The HTS hybrid mixer was designed with a center frequency of 27.5 GHz and a bandwidth of 1 GHz, and consisted of a rat-race coupler circuit with beam-lead diodes attached to its balanced ports. The HTS hybrid mixer with 1 GHz RF bandwidths exhibits a conversion loss of 6 dB. A LO-to-RF isolation was greater than 40 dB in the range of operating frequencies. Since the HTS/III-V hybrid mixer devices have lower noise and conversion loss, this technique provide us with new capabilities that can be effectively utilized in the field of local-point distribution service (LMDS) systems.

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Development of a Digital Down-mixer to Convert 5.1 Channel Audio Signals to Stereo Signals (5.1 채널 오디오 신호를 스테레오 신호로 변환하는 디지털 다운믹서 개발)

  • Jeon, Kwang-Sub;Cheong, Ho-Yong;Lee, Seung-Yo
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.12
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    • pp.1764-1770
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    • 2013
  • Use of the 5.1 channel audio signals suitable for the television system is improper for the radio broadcasting system, which uses the stereo audio system. Therefore, it is necessary to develop an audio down-mixer to convert 5.1 multi-channel audio signals to stereo signals for radio broadcasting. In this paper, a development of an audio down-mixer was carried out to convert 5.1 multi-channel audio signals to stereo signals. The down-mixer which was developed can use the audio signals separated from video signals, including sound signals or individual signals provided from 3-channel AES/EBU signals including Left(L), Right(R), Left Surround(Ls), Right Surround(Rs), Center(C) and Low Frequency Effect(Lfe) sounds as mixer inputs.

Numerical Study on the Flow Characteristics with a Vane-type Static Mixer in the Diesel Exhaust Systems (Vane-type Static Mixer에 의한 디젤차량 배기관 내의 유동 특성에 관한 연구)

  • Kang, Kyoung-Nam;Kim, Man-Young
    • Transactions of the Korean Society of Automotive Engineers
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    • v.20 no.5
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    • pp.36-43
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    • 2012
  • In this work the mixing and flow characteristics of a vane-type static mixer were investigated numerically for the reduction of NOx in the SCR-system of the diesel engines. The mixer was located in the 57 times pipe diameter away from the inlet. The analysis were performed by changing such various parameters as vane shape, angles, blockage ratio and location of the vane. The flow structure through the mixer was characterized by uniformity index and pressure drop. The results show that uniformity index and pressure coefficient are substantially influenced by the vane shape, angle, blockage ratio and position of the vane of the mixer.

Design of Predistortive Mixer (전치 왜곡 혼합기 설계)

  • 정용채
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.11 no.2
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    • pp.197-205
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    • 2000
  • The back-off input power level method is generally used for design of high linear mixer. In this paper, the predistortive mixer design method which attaches the predistortor in front of mixer is proposed to compensate the nonlinear characteristics of mixer and the predistortor has inverse nonlinear characteristics of mixer. The proposed method improves C/I ratio of mixer by 22 dB (@Po=-20 dBm/tone), 21.7 dB(@Po=-17 dBm/tone) with two tones of RF at 1852.5MHz, 1857.5MHz and LO at 2015MHz, respectively.

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Design of Mixer using Neutralization Technique (Neutralization을 이용한 주파수 변환기 설계)

  • Choi, Moon-Ho;Choi, Won-Ho;Kim, Yeong-Seuk
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.21 no.4
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    • pp.311-320
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    • 2008
  • In this paper, a 2.4 GHz low-voltage CMOS double-balanced down-conversion mixer using neutralization technique has been proposed and verified by circuit simulations and measurements. The grounded source structure was used for low-voltage operation. The neutralization technique was used to improve a conversion gain. The proposed mixer is fabricated in $0.25{\mu}m$ CMOS process for a 2.4 GHz wireless receiver. The mixer consumes 1.94 mW and gives conversion gain of 5.66 dB, input IP3 of 0.7 dBm and P1dB of -11.2 dBm at 1.5 V power supply. Measured results for the designed mixer show improved conversion gain of 2.86 dB over conventional mixer of grounded source structure.

Design of a LNA-Mixer with on-chip balun for 2.45GHz RFID Applications (On-chip 발룬을 포함한 2.45GHz대역 RFID용 LNA-Mixer설계)

  • Lim, Tae-Seo;Ko, Jae-Hyeong;Jung, Hyo-Bin;Kim, Hyeong-Seok
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.56 no.11
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    • pp.1982-1987
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    • 2007
  • This paper presents the design and analysis of LNA-Mixer for 2.45GHz RFID reader. The LNA is implemented by PCSNIM method for low power consumption. The Mixer is implemented by using the Gilbert-type configuration, current bleeding technique and the resonating technique for the tail capacitance. The connection between the two designed circuits is made by active balun. This LNA-Mixer has about 22dB gain and 8.5dB Noise Figure for -50dBm input RF power, LO power is 0dBm, RF frequency is 2.45 GHz and IF frequency is 100kHz. The layout of LNA-Mixer for one-chip design in a 0.18-um TSMC process has $2.5mm{\times}1.0mm$ size.