電気学会論文誌Ｃ（電子・情報・システム部門誌）
Online ISSN : 1348-8155
Print ISSN : 0385-4221
ISSN-L : 0385-4221
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127 巻, 8 号
選択された号の論文の22件中1～22を表示しています
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特集：新しい材料やプロセスを利用した機能弾性波素子
特集論文
<電子材料>
  • 高い機械的品質係数を持つビスマス層状構造強誘電体セラミックス
    永田 肇, 晝間 裕二, 鈴木 宗泰, 竹中 正
    2007 年 127 巻 8 号 p. 1141-1146
    発行日: 2007/08/01
    公開日: 2007/09/01
    DOIhttps://doi.org/10.1541/ieejeiss.127.1141
    ジャーナル フリー
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    The piezoelectric properties in some bismuth layer-structured ferroelectric (BLSF) ceramics were investigated focusing on a mechanical quality factor, Qm. Many BLSF compositions with various Curie temperature, Tc, were selected in this study, and the Qm values of (33) mode were plotted as a function of their Curie temperature, Tc. The Qm increased with increasing the Tc in the low Tc compositions below 500°C. It is considered to relate with the domain wall pinning because the coercive field, Ec also increased with increasing the Tc. However, in the high Tc compositions above 750°C, the Qm decreased with increasing the Tc contrary, because of the difficulties in poling treatment due to the Ec. On the other hand, high Qm values more than 10,000 were obtained in the intermediate Tc compositions between at 500 to 750°C. These values are quite high as the piezoelectric ceramics. The key point of the high Qm in these compositions is the poling process at high temperature of 300°C.
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  • 分極処理した4価金属ドープシリカ薄膜における圧電性と可視発光
    宇野 武彦, 野毛 悟, 藤塚 俊
    2007 年 127 巻 8 号 p. 1147-1154
    発行日: 2007/08/01
    公開日: 2007/09/01
    DOIhttps://doi.org/10.1541/ieejeiss.127.1147
    ジャーナル フリー
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    It is known that poling treatment in germanium-doped silica (Ge:SiO2) glass raises their optical nonlinearity and produces the Pockels effect. This means that the poling treatment in Ge:SiO2 produces asymmetricity in the glass. We generated piezoelectricity in poled Ge:SiO2 glass thin films. Tetravalent-metal-doped SiO2 (M4+:SiO2) films were prepared on Si substrates by RF magnetron sputtering. We used germanium, titanium, and tin as doping materials. However, less than a week later, piezoelectricity disappeared almost completely in all the samples. To prevent piezoelectricity from disappearing, we attempted to pin the doping ions. We developed a pinning technique based on the superstructure of a Ge-Ti-Sn:SiO2 and Ge-Ti-Zr:SiO2. The superstructure was very effective in preventing piezoelectricity from disappearing. Furthermore, broadband visible light emission was observed in the proposed superstructure film.
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<電子デバイス>
  • 43°面内回転STカット水晶SAW共振子における上側帯スプリアス発生機構の解明
    高木 道明, 神名 重男, 飯澤 慶吾, 山崎 隆
    2007 年 127 巻 8 号 p. 1155-1160
    発行日: 2007/08/01
    公開日: 2007/09/01
    DOIhttps://doi.org/10.1541/ieejeiss.127.1155
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    An unknown resonance is studied, which exists near upper stop band of IDT reflection characteristics, for the 43° in-plane rotated ST-cut of quartz SAW resonator. In this study, we analyze the displacement loci of surface wave at first, and find that slight skew angles exist in them. Simple simulation model is introduced to analyze the phenomenon and anti-symmetric model of T matrix explains that phenomenon adequately.
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  • LiTaO3/サファイア接合基板を用いた温度特性改善SAWデバイス
    三浦 道雄, 井上 将吾, 堤 潤, 松田 隆志, 上田 政則, 佐藤 良夫, 伊形 理, 江畑 泰男
    2007 年 127 巻 8 号 p. 1161-1165
    発行日: 2007/08/01
    公開日: 2007/09/01
    DOIhttps://doi.org/10.1541/ieejeiss.127.1161
    ジャーナル フリー
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    A novel temperature compensated SAW substrate was developed by using direct bonding techniques. This method has merits to keep the same coupling factor and propagation loss as the original piezoelectric substrate and need not strict control of substrate thickness. Temperature compensating method using direct bonding techniques requires support substrate with small thermal expansion coefficient and large elastic coefficients. Sapphire is one of the ideal materials for the support substrate. Thickness of the piezoelectric substrate has large influence on the temperature characteristics and spurious responses caused by reflection of bulk acoustic wave at the bonding interface. We found appropriate thickness of LiTaO3 with good temperature characteristics and no spurious responses. Using bonded LiTaO3/sapphire SAW substrate, US-PCS SAW duplexer with small temperature coefficient of frequency and good frequency characteristics was developed. Power durability of the duplexer using bonded LiTaO3/sapphire SAW substrate was excellent because of high thermal conductivity of sapphire.
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  • 段差量の大きなバイメサ水晶振動子のモード間結合量
    五箇 繁善, 間瀬 祐介, 関本 仁, 渡部 泰明
    2007 年 127 巻 8 号 p. 1166-1170
    発行日: 2007/08/01
    公開日: 2007/09/01
    DOIhttps://doi.org/10.1541/ieejeiss.127.1166
    ジャーナル フリー
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    In this paper, the bi-mesa resonators, which can be fabricated with very high mesa steps, were fabricated, and their frequency-temperature (f-T) characteristics were measured as an index of the mode-coupling strength. Since the mode-coupling affects to the first-order temperature coefficient of the TS-1 mode, the f-T curve of the pure TS-1 mode rotates clockwise depending on the mode-coupling strength. The experimental results showed that the tendency of the first-order coefficients of the measured f-T data were in good agreement with the calculated mode-coupling strength in the mesa height range of 0 to 50%. These results indicate the validity of the calculated mode-coupling strength between TS-1 and TF modes. It is also showed that choosing lower mesa height is desirable because the face-shear modes caused by the X-Z' boundary tend to couple with the TS-1 mode when the mesa step is very high.
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  • 弾性表面波素子基板上伝送線路特性の高精度モデリング手法
    山田 徹, 瓜生 一英, 治部 徹, 瀬尾 浩司, 橋本 研也, 山口 正恆
    2007 年 127 巻 8 号 p. 1171-1176
    発行日: 2007/08/01
    公開日: 2007/09/01
    DOIhttps://doi.org/10.1541/ieejeiss.127.1171
    ジャーナル フリー
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    A high accuracy modeling methodology for electrical characteristics of transmission electrodes on SAW substrates is established. In order to design SAW filter accurately, it is necessary to extract precise SAW material parameters from the measurement value of the reference SAW resonator. When measuring the SAW resonator, transmission lines are needed for feeding to contact probes. De-embedding procedure, which removes the influence of transmission lines, is very important for accurate characterization of the SAW resonator.
    In this paper, we apply the improved de-embedding procedure using SHORT, OPEN and THRU calibration patterns. The de-embedded transmission line is separated four parts and extracted the RLGC equivalent circuit model for each part. Furthermore, we derive the frequency characteristic of resistance element of the transmission line. Finally, de-embedding the transmission line accurately, we can get intrinsic characteristic of the SAW resonator. This method must be very useful to extract SAW material parameters and we can design SAW filters more effectively.
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<センシング>
<通信・ネットワーク>
  • 高周波SAWを用いた微量液体搬送システムの小電力化に関する検討
    佐々木 勉, 田中 康智, 大森 達也, 橋本 研也, 山口 正恆
    2007 年 127 巻 8 号 p. 1186-1191
    発行日: 2007/08/01
    公開日: 2007/09/01
    DOIhttps://doi.org/10.1541/ieejeiss.127.1186
    ジャーナル フリー
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    A droplet manipulator working with low driving power was developed by using the surface acoustic wave (SAW) technology. The manipulator was driven at a relatively high frequency of 350MHz to increase the SAW power density. First, a single phase unidirectional transducer (SPUDT) was designed. Because of its low insertion loss of 1.5 dB and high directivity of 10 dB, the SPUDT successfully conveyed a 100 nl water droplet with RF input power of 18 dBm (60 mW). Second, the SPUDT design was extended to a curved transducer to focus and launch the SAW energy into the narrow waveguide. Owing to the increased SAW power density, the required SAW power was reduced to 15 dBm (30 mW) for the 100 nl droplet manipulation. In addition, fabrication of liquid injectors was discussed for the formation of tiny droplet.
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特集研究開発レター
<電子デバイス>
論文
<電子・集積回路>
  • An Ultra-Wideband Amplifier MMIC for 3-10.6 GHz Wireless Applications with InGaP/GaAs HBT Technology
    Satoshi Kurachi, Toshihiko Yoshimasu, Haiwen Liu, Jia Chen, Yuichiro S ...
    2007 年 127 巻 8 号 p. 1194-1198
    発行日: 2007/08/01
    公開日: 2007/09/01
    DOIhttps://doi.org/10.1541/ieejeiss.127.1194
    ジャーナル フリー
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    An ultra-wideband amplifier MMIC has been demonstrated for the Ultra-Wide-Band (UWB) standard with InGaP/GaAs Heterojunction Bipolar Transistor (HBT) technology. The fabricated MMIC chip size is only 0.53 mm by 0.93mm. The amplifier MMIC includes all matching circuits on the chip. This amplifier MMIC is applicable to both a UWB low noise amplifier and a UWB transmitter amplifier by changing the collector current. The operating bias currents are 15 mA for a low noise amplifier and 30 mA for a transmitter amplifier. The collector bias voltage is 3.0 V. The MMIC as a transmitter amplifier exhibits a gain of 16 +/-1 dB and a third-order intercept point at the input (IIP3) of 0 dBm with 6.0 and 6.01 GHz signals with equal amplitude level. As a low noise amplifier, the MMIC exhibits a noise figure of less than 3.7 dB from 3.1 to 10.6 GHz.
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  • 伝送線路に接続された可変容量ダイオード負荷の動的C-V特性
    渡辺 武実, センクラシン アピラック, 松元 藤彦, 野口 泰明
    2007 年 127 巻 8 号 p. 1199-1205
    発行日: 2007/08/01
    公開日: 2007/09/01
    DOIhttps://doi.org/10.1541/ieejeiss.127.1199
    ジャーナル フリー
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    Crosstalk is induced by a reflected wave of a load connected with a transmission line. Thus, analysis of the reflected wave is important. The reflected wave generated from a nonlinear load is complicated. In order to estimate the complicated reflected wave, we measured the reflected and the incident waves for the nonlinear load, and estimated a dynamic C-V Characteristic that explain a relation between the incident and the reflected waves. This paper reports an simple experimental method to extract reflected waves at a varactor load and estimated results of the dynamic C-V Characteristic of the load. It is shown that the reflected voltage waves simulated using the dynamic C-V Characteristic agree with the measured results.
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<医用電子・生体工学>
<通信・ネットワーク>
  • 高速電力線通信における伝送特性シミュレーション
    北山 匡史, 仲林 見幸, 安部 淳一, 田邉 信二
    2007 年 127 巻 8 号 p. 1212-1220
    発行日: 2007/08/01
    公開日: 2007/09/01
    DOIhttps://doi.org/10.1541/ieejeiss.127.1212
    ジャーナル フリー
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    In Power Line Communication (PLC) systems, medium and low voltage power distribution lines are used as a communication network. However, since no consideration is given to signal transmission characteristics in the high frequency used for PLC systems, reflections caused by impedance mismatches deteriorate transmission characteristics. If channel characteristics of power lines can be estimated by simulation, it will be efficient for the design and the operation of PLC networks. This paper proposes a method to estimate transmission characteristics of a channel model between a transmitter and a receiver installed on a distribution network. Propagation characteristics of PLC signals at each distribution facility is described using two port networks. A channel model is automatically generated from the combination of component models along the topology of distribution network and the locations of a transmitter and a receiver. The proposed method was validated using measurement data of a test distribution network and was proved to be effective.
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<制御・計測>
<ソフトコンピューティング>
  • Multi-Amplitude and Multi-Phase Synchronization Phenomena in Nonlinear Large-Scaled Oscillating Cellular Neural Networks
    Ganesh Kumar Basnet, Nao Ohashi, Masayuki Yamauchi, Mamoru Tanaka
    2007 年 127 巻 8 号 p. 1243-1250
    発行日: 2007/08/01
    公開日: 2007/09/01
    DOIhttps://doi.org/10.1541/ieejeiss.127.1243
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    The synchronization is very important technology in the field of Cellular Neural Networks (CNNs) due to its various applications from the biological, environmental to communication points of view. This paper deals with the parametric synchronization phenomena in large-scaled oscillating CNN. When we determine adequate parameters for the amplitude and frequency in the large-scaled oscillating CNNs with non-oscillating cells, the CNN oscillates in various ways depending on their conditions. In this paper, we have exhibited that both multi-amplitude and multi-phase synchronization are generated by their parameters. To demonstrate them, we simulated multi-dimensional CNN of 4 × 4 (16cells), 8 × 8 (64cells) and 16 × 16 (256cells) and checked the synchronization phenomena. Each cell has an inductor L, a capacitorC and a complex nonlinear conductance as i=f(v). We find that the synchronization phenomena are similarly occurred from the small networks to the larger one. We give a basic theoretical viewpoint for interesting numerical experiment results for the synchronization phenomena in this paper.
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<システム>
研究開発レター
<電子応用>
  • 光ファイバ給電型データリンクの屋外伝送路での検討
    山下 育男, 尾路 京一, 青海 恵之
    2007 年 127 巻 8 号 p. 1266-1267
    発行日: 2007/08/01
    公開日: 2007/09/01
    DOIhttps://doi.org/10.1541/ieejeiss.127.1266
    ジャーナル フリー
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    A fiber optic powering data link is experimentally investigated using an optical fiber installed outside. Two optical fibers are prepared for parallel use in respect to the powering lights and for a loop structure for the signal light. High power LDs with wavelengths around 1.48μm developed for optical amplifiers are used for the powering light sources. A 1.55-μm CW light is transmitted together with the powering light from the master node and then modulated at the slave node. Stability of the system is clarified by simultaneous propagation of the 10-Gbit/s signal light and the 1.48-μm powering lights. Temperature rising induced by the optical loss near a bending point is also evaluated for practical use.
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<音声画像処理・認識>
  • 自己聴取音に占める気導音と骨導音の割合の推定
    森 幹男, 吉田 千夏, 荻原 慎洋, 谷口 秀次, 高橋 謙三
    2007 年 127 巻 8 号 p. 1268-1269
    発行日: 2007/08/01
    公開日: 2007/09/01
    DOIhttps://doi.org/10.1541/ieejeiss.127.1268
    ジャーナル フリー
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    In order to build the system which enables voice training interactively between the user and system, it is required to output the singing voice with rich sound as a teacher sound. Since the user listen to his own bone-transmitted sound as well as his air- transmitted sound when he utters, it is ideal to mix and output the bone-transmitted sounds with the air transmitted sounds of the teacher sound at the same mixing rate where the user actually listens to his singing voice. Here we present the result of investigation what rate of the air- transmitted and bone-transmitted sounds matches the natural situation of listening in utterance.
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<制御・計測>
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