Search Results:　 1-20 of 211

  • 1

    A Study on Transversal-Filter Type of Power Amplifier for Applying Switching Operation Transmitter  [in Japanese]

    KOJIMA Michiaki , IZUMI Hironori , UMEDA Yohtaro , TAKYU Osamu

    無線通信における送信機は高電力効率,高線形性,低歪特性を持つことが必要である.これらを実現するために,パルス変調にΔ-Σ変調器を用いる包絡線パルス幅変調(EPWM)送信機が近年注目されている.EPWM方式は,電力増幅器に方形波を入力する構成により高い電力効率と線形性が得られ,また,Δ-Σ変調器によるノイズシェーピング特性により所望信号帯域内の量子化雑音低減を可能とする.帯域外にシェーピングされた量 …

    Technical report of IEICE. RCS 111(451), 347-352, 2012-02-29

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  • 2

    ANC-EPWM Transmitter Using Maximally Flat IIR Filter  [in Japanese]

    IWAKI Koji , YOKOZAWA Shinsuke , YAMAO Yasushi

    … で高効率かつ線形に増幅することは困難である.この課題を解決するための一つの手法としてEPWM(Envelope Pulse-Width Modulation)送信法が提案され,さらに,EPWM送信法で発生する量子化雑音を効果的に低減するANC(Amplitude Noise Compensating)-EPWM送信法が検討されている.本稿では,ANC-EPWM送信法の構成要素の一つであり,その性能を左右する雑音帯域制限LPFに低次の最大平坦IIRフィルタを用いることで,回路規模を削減しながら十分な量子化 …

    Technical report of IEICE. RCS 111(451), 341-346, 2012-02-29

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  • 3

    A CMOS Class-G Supply Modulation for Polar Power Amplifiers with High Average Efficiency and Low Ripple Noise

    LIU Qing , SUN Jiangtao , SUH YongJu , ITOH Nobuyuki , YOSHIMASU Toshihiko

    … In this paper, a CMOS Class-G supply modulation for polar power amplifiers with high average efficiency and low ripple noise is proposed. … In the proposed Class-G supply modulation, the parallel supply modulations which are controlled by switch signals are utilized for low power and high power supplies to increase the average efficiency. …

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences 95(2), 487-497, 2012-02-01

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  • 4

    Noise Canceling Balun-LNA with Enhanced IIP2 and IIP3 for Digital TV Applications

    SAEEDI Saeed , ATARODI Mgjtaba

    … An inductorless low noise amplifier (LNA) with active balun for digital TV (DTV) applications is presented. … The LNA exploits a noise cancellation technique which allows for simultaneous wide-band impedance matching and low noise design. …

    IEICE Transactions on Electronics 95(1), 146-154, 2012-01-01

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  • 5

    L-Band SiGe HBT Frequency-Tunable Dual-Bandpass or Dual-Bandstop Differential Amplifiers Using Varactor-Loaded Series and Parallel LC Resonators

    SAKAMOTO Kazuyoshi , ITOH Yasushi

    … L-band SiGe HBT frequency-tunable differential amplifiers with dual-bandpass or dual-bandstop responses have been developed for the next generation adaptive and/or reconfigurable wireless radios. … Varactor-loaded dual-band resonators comprised of series and parallel LC circuits are employed in the output circuit of differential amplifiers for realizing dual-bandpass responses as well as the series feedback circuit for dual-bandstop responses. …

    IEICE Transactions on Electronics E95.C(12), 1839-1845, 2012

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  • 6

    Comparison of LNAs fabricated in 65-nm CMOS GP and LP processes for the Square Kilometre Array

    Belostotski Leonid

    … In this work two 0.7-1.4GHz room-temperature 65nm CMOS low noise amplifiers (LNAs), designed for the Square Kilometre Array (SKA) radio telescope receiver, are compared. … One LNA was fabricated with low-power (LP) transistors whereas the other, otherwise identical LNA, was fabricated with general-purpose (GP) transistors. … As shown there are electrical and noise performance differences between the two circuits. …

    IEICE Electronics Express 9(7), 636-641, 2012

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  • 7

    Broadband Low Noise Amplifier Design in Scaled CMOS Technology

    Patrick Ben , Kaho Takana , Masui Shoichi

    ユビキタス社会の広がりとともに、多種多様な無線通信システムの利用が増えてきており、様々な周波数帯に対応できる統合無線プラットフォームの実現が望まれている。本報告では、このような将来無線システムに対応する広帯域な低雑音増幅器(LNA)を検討した。提案するLNAはInductor-lessの回路トポロジを採用することにより小型化が可能であり、かつ多段構成を用いる事によって、雑音指数、利得、線形性および …

    Technical report of IEICE. ICD 111(352), 29-34, 2011-12-08

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  • 8

    A 140-GHz Receiver Array IC and Sub-Assembly for Passive Imaging System : Development of Compact Passive Imaging System  [in Japanese]

    KOSUGI Toshihiko , SUGIYAMA Hiroki , MATSUZAKI Hideaki , MURATA Koichi

    動作周波数140GHzの4chパッシブイメージング受信ICを,ゲート長0.1mmのInP HEMT及び二層配線プロセスで作成した.ICには4チャネル分の低雑音アンプ(LNA),ディッケスイッチ,ショットキーダイオード検波器が搭載されている.ディッケスイッチの挿入損失は1dB, on-off比は8dBである.5段のLNAは挿入利得30dB,雑音指数5dBである.ICの消費電力は0.09W/受信チャネ …

    IEICE technical report. Electron devices 111(338), 31-34, 2011-12-07

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  • 9

    A Low-Power IF Circuit with 5dB Minimum Input SNR for GFSK Low-IF Receivers

    ZHAO Bo , YU Guangming , CHEN Tao , CHEN Pengpeng , YANG Huazhong , WANG Hui

    … A low-power low-noise intermediate-frequency (IF) circuit is proposed for Gaussian frequency shift keying (GFSK) low-IF receivers. … The proposed IF circuit is realized by an all-analog architecture composed of a couple of limiting amplifiers (LAs) and received signal strength indicators (RSSIs), a couple of band-pass filters (BPFs), a frequency detector (FD), a low-pass filter (LPF) and a slicer. …

    IEICE Transactions on Electronics 94(10), 1680-1689, 2011-10-01

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  • 10

    A Wide Dynamic Range Variable Gain Amplifier with Enhanced IP1 dB and Temperature Compensation

    SATO Hisayasu , MARUYAMA Takaya , MATSUOKA Toshimasa , TANIGUCHI Kenji

    … The VGA uses parallel amplifiers for the first and second amplifiers in order to improve the input third-order intercept point (IIP3) in the low gain region. … To investigate the behavior of the VGA, the gain and linearity analyses are newly derived for the parallel amplifiers, and are compared with the measured results. …

    IEICE Transactions on Electronics 94(8), 1311-1319, 2011-08-01

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  • 11

    SIS junction as microwave and millimeter wave noise source  [in Japanese]

    INOUE Hirofumi , NOGUCHI Takashi , KOHNO Kotaro

    マイクロ波帯における低雑音冷却増幅器の正確な特性評価を目的として,超伝導トンネル接合で生じるショットノイズを利用した雑音源を開発した.1×1μm^2の接合面積を持つNb-Al/AlOx-Nb超伝導トンネル接合を水晶基板上に製作し,隋体内にマウントした.冷却アイソレータと組み合わせた4-8GHz帯低雑音増幅器を既存の冷却アッテネータを用いた方法と超伝導トンネル接合を用いた方法と比較した.二つの方法で …

    Technical report of IEICE. SCE 111(130), 23-28, 2011-07-06

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  • 12

    A Low-Power Mixed-Architecture ADC with Time-Interleaved Correlated Double Sampling Technique and Power-Efficient Back-End Stages

    LIN Jin-Fu , CHANG Soon-Jyh

    … In this paper, two techniques for implementing a low-power pipelined analog-to-digital converter (ADC) are proposed. … First, the time-interleaved correlated double sampling (CDS) technique is proposed to compensate the finite gain error of operational amplifiers in switched-capacitor circuits without a half-rate front-end sample-and-hold amplifier (SHA). …

    IEICE Transactions on Electronics 94(1), 89-101, 2011-01-01

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  • 13

    Towards ultrasensitive optical links enabled by low-noise phase-sensitive amplifiers

    TONG Z.

    Nature Photonics 5, 430-436, 2011

    Cited by (3)

  • 14

    Design of Small Area Active-Feedback Low-Noise Amplifier  [in Japanese]

    KANEMARU Masaki , SAITO Noriaki

    … 一方で無線受信回路の初段に置かれる低雑音増幅器(Low Noise Amplifier, LNA)は、要求される性能からリコンフィギュアラブル化が難しく、またチップ面積が大きいという課題も抱えている。 …

    IEICE technical report. Microwaves 110(343), 41-46, 2010-12-09

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  • 15

    Mixed-Mode Extraction of Figures of Merit for InGaAs Quantum-Well Lasers and SiGe Low-Noise Amplifiers

    TSENG Hsien-Cheng , HORNG Jibin , HU Chieh , TSAU Seth

    … The technique, substantially extended from our previous work, allows the designed figures-of-merit, such as internal quantum efficiency (ηi) as well as transparency current density (Jtr) of lasers and minimum noise figure (NFmin) as well as associated available gain (GA, assoc) of low-noise amplifiers (LNAs), extracted by an analytical equation-based methodology combined with an evolutionary numerical tool. …

    IEICE Transactions on Electronics 93(11), 1645-1647, 2010-11-01

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  • 16

    Gain and Bandwidth Tunable Multi-band Differential Amplifiers  [in Japanese]

    ITOH Yasushi , SAKAMOTO Kazuyoshi , CAO Wei , SAKURAI Keita , MURATA Toshihiko

    次世代マルチバンド・マルチモード無線送受信機用に,利得および帯域可変マルチバンド差動増幅器を開発したので報告する.本増幅器はバラクタダイオードを装荷したバイアス回路を用いることにより帯域の下限周波数または上限周波数を独立して変化でき,また能動負荷またはカスコードBJTを用いることにより利得の微調整または粗調整を行うことができる.0.35μm SiGe HBTおよび容量変化比が4.4:1のSiパラク …

    Technical report of IEICE. OPE 110(156), 193-197, 2010-07-22

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  • 17

    Gain and Bandwidth Tunable Multi-band Differential Amplifiers  [in Japanese]

    ITOH Yasushi , SAKAMOTO Kazuyoshi , CAO Wei , SAKURAI Keita , MURATA Toshihiko

    次世代マルチバンド・マルチモード無線送受信機用に,利得および帯域可変マルチバンド差動増幅器を開発したので報告する.本増幅器はバラクタダイオードを装荷したバイアス回路を用いることにより帯域の下限周波数または上限周波数を独立して変化でき,また能動負荷またはカスコードBJTを用いることにより利得の微調整または粗調整を行うことができる.0.35μm SiGe HBTおよび容量変化比が4.4:1のSiバラク …

    IEICE technical report. Microwaves 110(155), 193-197, 2010-07-22

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  • 18

    A Complementary Metal–Oxide–Semiconductor Image Sensor with 2.0 e- Random Noise and 110 ke- Full Well Capacity and Noise Measurement of Pixel Transistors Using Column Source Follower Readout Circuits

    Takahiro Kohara , Woonghee Lee , Koichi Mizobuchi , Shigetoshi Sugawa

    … A low noise complementary metal–oxide–semiconductor (CMOS) image sensor without degradation of saturation performance has been developed by using column amplifiers of the gains of about 1.0 in a lateral overflow integration capacitor technology. …

    Jpn J Appl Phys 49(4), 04DE02-04DE02-5, 2010-04-25

    The Japan Society of Applied Physics

  • 19

    Column Readout Circuit Design for High-Speed Low-Noise Imaging  [in Japanese]

    KAWAHITO Shoji

    CMOSイメージセンサにおいて、高画質(低ノイズ)の信号を高速に読み出すための、カラム読み出し回路に関して解説する。画素内ソースフォロワアンプも含めたカラム増幅器のノイズと応答時間の関係から、高速読み出しと低ノイズ撮像の間にはトレードオフの関係があることを示す。また、低ノイズ・広ダイナミックレンジと高速読み出しを両立させる上でカラム並列型のA/D変換器が有効である。代用的なシングルスロープ型、逐次 …

    ITE Technical Report 34(16), 29-34, 2010-03-26

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  • 20

    A Transformer Noise-Canceling Ultra-Wideband CMOS Low-Noise Amplifier

    KIHARA Takao , MATSUOKA Toshimasa , TANIGUCHI Kenji

    … Previously reported wideband CMOS low-noise amplifiers (LNAs) have difficulty in achieving both wideband input impedance matching and low noise performance at low power consumption and low supply voltage. … We present a transformer noise-canceling wideband CMOS LNA based on a common-gate topology. …

    IEICE Transactions on Electronics 93(2), 187-199, 2010-02-01

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