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    • 38. 发明专利
    • D/a converter
    • D / A转换器
    • JP2003283338A
    • 2003-10-03
    • JP2002084004
    • 2002-03-25
    • Mitsubishi Electric Corp三菱電機株式会社
    • OKI MASAJI
    • H03K5/26H03M3/02H03M3/04
    • H03M3/50H03M3/346H03M3/506
    • PROBLEM TO BE SOLVED: To provide a D/A converter, which switches an input sampling frequency by itself to reduce the load of a control means equipped externally.
      SOLUTION: The D/A converter is equipped with a fs detecting means 8 for detecting a sampling frequency fs of digital data using a sampling clock LRCK and a master clock xfso, an over-sampling digital filter 3 for conducting over-sampling for digital data based on an input sampling frequency fs, a fs change detecting means 9 for detecting changes in the input sampling frequency fs, and a mute control means 7 for muting data to be D/A converted based on the detected result by the fs change detecting means 9.
      COPYRIGHT: (C)2004,JPO
    • 要解决的问题:提供一种D / A转换器,其自身切换输入采样频率以减少外部配备的控制装置的负载。 解决方案:D / A转换器配备有fs检测装置8,用于使用采样时钟LRCK和主时钟xfso检测数字数据的采样频率fs,用于进行过采样的过采样数字滤波器3 用于基于输入采样频率fs的数字数据,用于检测输入采样频率fs的变化的fs变化检测装置9以及用于根据fs的检测结果使数据变为D / A转换的静音控制装置7 变更检测装置9.版权所有(C)2004,JPO
    • 39. 发明专利
    • Wireless user terminal and system having high speed, high resolution, digital-to-analog converter with off- line sigma delta conversion and storage
    • 具有高速,高分辨率,数字到模拟转换器的无线用户终端和系统,具有离线SIGMA DELTA转换和存储
    • JP2003051793A
    • 2003-02-21
    • JP2002164945
    • 2002-04-30
    • Texas Instruments Incテキサス インスツルメンツ インコーポレイテッド
    • PANASIK CARL MVISWANATHAN T R
    • H03M7/32H03M3/04H04B14/06
    • H03M3/50H04W4/18H04W88/02
    • PROBLEM TO BE SOLVED: To provide a wireless communications apparatus and corresponding system having an improved digital/analog converter implementing high speed and high resolution.
      SOLUTION: The invention comprises a wireless user terminal (302) and corresponding system (300) that implement a digital-to-analog conversion circuit (105) including a storage means (110), such as a read only memory, for storing delta-sigma analog sequences corresponding to all possible values of a digital input (106) connected to a plurality of one-bit digital-to-analog converters (120, 122, 124, 126). Each of the digital-to-analog converters (120, 122, 124, 126) is clocked by multi-phase clocks, such that each phase applied to each one of the digital-to-analog converters (120, 122, 124, 126) is delayed one another by the oversampling period. An adder is connected to each of the digital-to-analog converters (120, 122, 124, 126) for summing each output from each of the digital- to-analog converters (120, 122, 124, 126) to generate an analog output.
      COPYRIGHT: (C)2003,JPO
    • 要解决的问题:提供一种具有实现高速度和高分辨率的改进的数字/模拟转换器的无线通信装置和相应的系统。 解决方案:本发明包括实现数模转换电路(105)的无线用户终端(302)和对应系统(300),数字 - 模拟转换电路(105)包括诸如只读存储器的存储装置(110) 西格玛模拟序列对应于连接到多个一比特数模转换器(120,122,124,126)的数字输入(106)的所有可能值。 每个数模转换器(120,122,124,126)由多相时钟计时,使得施加到数模转换器(120,122,124,126)中的每一个 )在过采样期间相互延迟。 加法器连接到每个数模转换器(120,122,124,126),用于对每个数模转换器(120,122,124,126)的每个输出求和,以产生模拟 输出。
    • 40. 发明专利
    • Base station having high-speed, high resolution, digital-to- analog converter with off-line sigma delta conversion and storage
    • 具有高速,高分辨率,数字模拟转换器的基站具有离线SIGMA DELTA转换和存储
    • JP2002368680A
    • 2002-12-20
    • JP2002128819
    • 2002-04-30
    • Texas Instruments Incテキサス インスツルメンツ インコーポレイテッド
    • PANASIK CARL MVISWANATHAN T R
    • H03M7/32H03M3/02H04B7/26
    • H03M3/50
    • PROBLEM TO BE SOLVED: To provide a wireless base station, having an improved digital-to- analog converter which is operable at higher speed than heretofore achievable.
      SOLUTION: The base station comprises a base station 300 that implements a digital-to-analog conversion circuit including a storage means, such as a read only memory, for storing delta-sigma analog sequences corresponding to all possible values of a digital input (106) coupled to a plurality of one-bit digital-to- analog converters. Each of the digital-to-analog converters is clocked by multi- phase clocks, such that each phase applied to each one of the digital-to-analog converters is delayed with respect to one another by the oversampling period. A summer is coupled to each digital-to-analog converter for summing each output from each digital-to-analog converter to generate an analog output. Hereby, the digital-to-analog conversion circuit emulates a delta-sigma digital-to- analog converter, having both high-speed and high resolution.
      COPYRIGHT: (C)2003,JPO
    • 要解决的问题:提供一种无线基站,具有改进的数模转换器,该转换器可以以比迄今为止可实现的更高的速度运行。 解决方案:基站包括实现数模转换电路的基站300,该数模转换电路包括诸如只读存储器的存储装置,用于存储对应于数字输入(106)的所有可能值的Δ-Σ模拟序列 )耦合到多个一位数模转换器。 每个数模转换器由多相时钟提供时钟,使得施加到每个数模转换器的每个相位相对于彼此延迟过采样周期。 每个数模转换器耦合一个加法器,用于对来自每个数模转换器的每个输出求和以产生模拟输出。 因此,数模转换电路模拟具有高速和高分辨率的三角形数模转换器。