High-efficiency linear power amplifier
    81.
    发明授权
    High-efficiency linear power amplifier 有权
    高效线性功率放大器

    公开(公告)号:US07042283B2

    公开(公告)日:2006-05-09

    申请号:US10806245

    申请日:2004-03-23

    IPC分类号: H03F3/66

    摘要: A transmission signal and a pilot signal are predistorted by a digital predistorter 13 by use of a power-series model, and the predistorted output is converted by a digital-analog converter 14 to an analog signal. The analog signal is up converted by a frequency converter 15 to an RF-band signal, which is transmitted after being power-amplified by a Doherty amplifier 16. The pilot signal is extracted by a pilot signal extractor 17 from the output from the Doherty amplifier, and the extracted pilot signal is down converted by a frequency converter 18 to a baseband signal. The baseband pilot signal is converted by an analog-digital converter 19 to a digital pilot signal. A control part 21 detects an odd-order distortion component from the digital pilot signal, and based on the detected result, controls parameters of the digital predistorter.

    摘要翻译: 传输信号和导频信号由数字预失真器13通过使用功率系列模型进行预失真,并且预失真输出由数模转换器14转换为模拟信号。 模拟信号由频率转换器15上变频到RF带信号,该信号在由Doherty放大器16进行功率放大后传输。 导频信号由导频信号提取器17从Doherty放大器的输出提取,并且提取的导频信号由频率转换器18下变频到基带信号。 基带导频信号由模拟数字转换器19转换成数字导频信号。 控制部分21从数字导频信号中检测奇数失真分量,并根据检测结果控制数字预失真器的参数。

    Communication system using optical fibers

    公开(公告)号:US07013087B2

    公开(公告)日:2006-03-14

    申请号:US09983705

    申请日:2001-10-25

    CPC分类号: H04B10/25755

    摘要: A divider/combiner unit combines RF signals, then converts the combined signal into an optical signal and sends it over an optical fiber. N radio access units each convert the optical signal received from the optical fiber into an RF signal and transmits it from an antenna, and each radio access unit converts an RF signal received by the antenna into an optical signal and sends it over an optical fiber to the divider/combiner unit. The divider/combiner unit converts the received optical signal into RF signals and outputs them. This system is operated as plurality of communication systems in common to them in correspondence to a plurality of input/output terminals of the divider/combiner unit.

    Multi-band feed-forward amplifier and adjustment method therefor
    84.
    发明申请
    Multi-band feed-forward amplifier and adjustment method therefor 有权
    多频带前馈放大器及其调整方法

    公开(公告)号:US20050163254A1

    公开(公告)日:2005-07-28

    申请号:US11043638

    申请日:2005-01-27

    IPC分类号: H03F1/32 H04L25/03

    CPC分类号: H03F1/3223

    摘要: A multi-band feed-forward amplifier is formed by: a dividing part for dividing and applying an input signal containing signals of multiple frequency bands to a linear signal path and N vector adjustment paths of a distortion detecting circuit; frequency band signal extractors provided in the N vector adjustment paths, respectively, for extracting signals of N frequency bands; N vector adjusters for adjusting the vectors of the output signals from the respective frequency band signal extractors; a main amplifier for amplifying the output signals from the N vector adjusters; a combining/dividing part for combining the amplified signals and the signal from the linear signal path of the distortion detecting circuit and for dividing and applying the combined output to a linear signal path and N distortion injection paths of a distortion cancelling circuit; frequency band signal extractors provided in the N distortion injection paths, respectively, for extracting the signals of the N frequency bands; vector adjusters for adjusting the vectors of signals separated into the N frequency bands; an auxiliary amplifying part for amplifying the vector-adjusted N signals; and a combining part for combining the amplified signals and the signal from the linear signal path of the distortion cancelling circuit.

    摘要翻译: 多频带前馈放大器通过以下部分形成:分割部分,将包含多个频带的信号的输入信号分割并施加到线性信号路径和失真检测电路的N个矢量调整路径; 提供在N个矢量调整路径中的用于提取N个频带的信号的频带信号提取器; N矢量调整器,用于调整来自相应频带信号提取器的输出信号的矢量; 用于放大来自N个矢量调节器的输出信号的主放大器; 组合/分割部分,用于组合放大的信号和来自失真检测电路的线性信号路径的信号,并将组合输出分频并施加到失真消除电路的线性信号路径和N个失真注入路径; 提供在N个失真注入路径中的频带信号提取器,用于提取N个频带的信号; 矢量调节器,用于调整分离成N个频带的信号矢量; 用于放大矢量调整的N信号的辅助放大部分; 以及组合部分,用于组合放大的信号和来自失真消除电路的线性信号路径的信号。

    Power amplifier
    87.
    发明申请
    Power amplifier 失效
    功率放大器

    公开(公告)号:US20050030104A1

    公开(公告)日:2005-02-10

    申请号:US10912116

    申请日:2004-08-06

    摘要: A power amplifier (1) for receiving and amplifying an input signal (10) and outputting an output signal (11) is disclosed. The power amplifier comprises: N power amplifying units (12) (N is an integer larger than 1) connected in parallel so as to output amplified signals in response to the input signal (10); an output combining unit (14) for combining the output signals from the N power amplifying units (12) and outputting a combined signal as the output signal (11) of the power amplifier; and an amplitude controlling unit (15) for selectively turning ON each of the N power amplifying units (12) based on an amplitude of the input signal (10). In the power amplifier, the amplitude controlling unit (15) may comprise N amplitude adjusters (113) connected in parallel for adjusting the amplitude of the input signal (110) of the power amplifier; and a controller (115) for selectively turning ON each of the N power amplifying units (112) and controlling the amplitude adjusters (113) so that an amplitude of the output signal (111) becomes a substantially continuous function with respect to the amplitude of the input signal (110). The power amplifier may further comprise a local oscillator (222) outputting an constant envelope signal, receiving a modulation signal (210) as the input signal of the power amplifier and outputting an amplified modulated signal (211) as the output signal of the power amplifier; wherein the N power amplifying units comprise N saturation amplifying units connected in parallel so as to amplify the constant envelope signal from the local oscillator; and the amplitude controlling unit comprises an amplifying controller (215) for selectively turning ON each of the N saturation amplifying units (212) based on an amplitude of the modulation signal (210).

    摘要翻译: 公开了一种用于接收和放大输入信号(10)并输出输出信号(11)的功率放大器(1)。 功率放大器包括:并联连接的N个功率放大单元(12)(N是大于1的整数),以响应输入信号(10)输出放大的信号; 输出组合单元(14),用于组合来自N个功率放大单元(12)的输出信号并输出​​组合信号作为功率放大器的输出信号(11); 以及用于基于所述输入信号(10)的幅度选择性地接通所述N个功率放大单元(12)中的每一个的振幅控制单元(15)。 在功率放大器中,振幅控制单元(15)可以包括并联连接的N个振幅调节器(113),用于调节功率放大器的输入信号(110)的振幅; 以及控制器(115),用于选择性地接通N个功率放大单元(112)中的每一个并且控制幅度调节器(113),使得输出信号(111)的幅度相对于 输入信号(110)。 功率放大器还可以包括输出恒定包络信号的本地振荡器(222),接收作为功率放大器的输入信号的调制信号(210),并输出放大的调制信号(211)作为功率放大器的输出信号 ; 其中所述N个功率放大单元包括并联连接的N个饱和放大单元,以便放大来自本地振荡器的恒定包络信号; 并且幅度控制单元包括放大控制器(215),用于基于调制信号(210)的幅度有选择地接通N个饱和放大单元(212)中的每一个。

    Signal power dynamic range compressing circuit and power amplifier using the same
    89.
    发明授权
    Signal power dynamic range compressing circuit and power amplifier using the same 有权
    信号功率动态范围压缩电路和功率放大器使用相同

    公开(公告)号:US06621367B2

    公开(公告)日:2003-09-16

    申请号:US09749807

    申请日:2000-12-28

    IPC分类号: H04B164

    CPC分类号: H04L27/2626 H04L27/2621

    摘要: In an input signal power dynamic range compressing circuit, an input signal is distributed by a directional coupler to a linear signal transfer path and a compressing signal generating path, and in the compressing signal generating path a compressing signal, which keeps the peak-to-average-power ratio of the input signal below a predetermined value, is generated from the input signal. The compressing signal is combined by a power combiner with the input signal having passed through the linear signal transfer path.

    摘要翻译: 在输入信号功率动态范围压缩电路中,输入信号由定向耦合器分配到线性信号传送路径和压缩信号产生路径,并且在压缩信号产生路径中压缩信号保持峰 - 从输入信号生成低于预定值的输入信号的平均功率比。 压缩信号由功率组合器与已经通过线性信号传送路径的输入信号组合。

    Process for producing substrate for photosensitive drum and substrate for photosensitive drum
    90.
    发明授权
    Process for producing substrate for photosensitive drum and substrate for photosensitive drum 失效
    感光鼓用基材和感光鼓用基材的制造方法

    公开(公告)号:US06474204B1

    公开(公告)日:2002-11-05

    申请号:US09691619

    申请日:2000-10-18

    IPC分类号: B23B100

    摘要: The present invention relates to a process for producing a substrate for a photosensitive drum, comprising machining a cylindrical stock tube by a turning tool to form a cylindrical substrate having a surface roughness of 0.5 to 5 &mgr;m and being provided on the surface thereof with the streaks extending in the approximately circumferential direction thereof, said turning tool being constituted by monocrystalline diamond and having a cutting edge provided with a saw-like portion along an effective cutting length thereof, and a substrate which is suitable for the production of a photosensitive drum being free from the occurrence of interference fringes and has fine streaks uniformly formed on the surface thereof by machining without burrs, and the substrate capable of producing a higher-quality photosensitive drum. Such a substrate is suitable for the production of a photosensitive drum being free from the occurrence of interference fringes and has fine streaks uniformly formed on the surface thereof by machining without burrs.

    摘要翻译: 本发明涉及一种感光鼓用基材的制造方法,其特征在于,包括用旋转工具对圆筒状的储料管进行加工,形成表面粗糙度为0.5〜5μm的圆筒状基材,在其表面上设置条纹 在大致圆周方向上延伸,所述转动工具由单晶金刚石构成,并且具有沿其有效切割长度设置有锯状部分的切割边缘,以及适于制造感光鼓的基板 从干涉条纹的出现出发,通过无毛刺的机械加工而在其表面上均匀地形成细条纹,以及能够制造更高品质的感光鼓的基板。这种基板适用于制造不含 发生干涉条纹,并且在冲浪上均匀地形成细条纹 通过机械加工而不产生毛刺。