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    • 71. 发明授权
    • Receiving device and receiving method for determining doppler frequency from pilot signals using OFDM
    • 使用OFDM从导频信号确定多普勒频率的接收装置和接收方法
    • US09059887B2
    • 2015-06-16
    • US13870572
    • 2013-04-25
    • FUJITSU LIMITEDFUJITSU SEMICONDUCTOR LIMITED
    • Masataka UmedaNaoto Adachi
    • H04L27/06H04L27/26
    • H04L27/265H04L5/0048H04L25/0222H04L27/2657H04L27/2675H04L27/2695
    • A receiving device for receiving OFDM signals in which arrangement of pilot signals changes with symbol time, includes: an inverse Fourier transform unit configured to calculate an impulse response by performing an inverse Fourier transform on pilot signals included in a received signal; a first Doppler frequency estimation unit configured to estimate a first Doppler frequency from a phase rotation amount at peak positions between impulse responses of pilot signals of different subcarriers of the impulse responses; a second Doppler frequency estimation unit configured to estimate a second Doppler frequency from a phase rotation amount between impulse responses of pilot signals of the same subcarrier of the impulse responses; and a Doppler frequency selection unit configured to select one of the first and the second Doppler frequency estimated by the first and the second Doppler frequency estimation unit so as to reduce influence of a multipath.
    • 一种接收装置,用于接收导频信号的配置以符号时间改变的OFDM信号,包括:傅里叶逆变换单元,被配置为通过对包括在接收信号中的导频信号执行傅里叶逆变换来计算脉冲响应; 第一多普勒频率估计单元,被配置为从脉冲响应的不同子载波的导频信号的脉冲响应之间的峰值位置处的相位旋转量估计第一多普勒频率; 第二多普勒频率估计单元,被配置为从脉冲响应的相同子载波的导频信号的脉冲响应之间的相位旋转量估计第二多普勒频率; 以及多普勒频率选择单元,被配置为选择由第一和第二多普勒频率估计单元估计的第一和第二多普勒频率中的一个,以减少多径的影响。
    • 73. 发明授权
    • SAR analog-to-digital conversion method and SAR analog-to-digital conversion circuit
    • SAR模数转换方法和SAR模数转换电路
    • US09054732B2
    • 2015-06-09
    • US14249973
    • 2014-04-10
    • FUJITSU SEMICONDUCTOR LIMITED
    • Tomoya Kakamu
    • H03M1/38H03M1/12H03M1/46H03M1/44
    • H03M1/38H03M1/129H03M1/162H03M1/206H03M1/44H03M1/468
    • An SAR analog-to-digital conversion circuit includes: first and second CDACs; first to third comparators respectively comparing outputs of the first and second CDACs, output levels of the first and third CDACs with a reference level; an arithmetic operation circuit; and an SAR control circuit, wherein the SAR control circuit: at each step, determines in which of four ranges output levels of the sampled and held signals of the first and second CDACs are included, the four ranges corresponding to the conversion range being quartered, determines two bits of the digital data and adjusts the output levels of the first and second CDACs so that a level at ¼ or ¾ of the voltage range agrees with the intermediate level, and controls first and second switches so that the voltage range is set to be a conversion range at a next step.
    • SAR模数转换电路包括:第一和第二CDAC; 分别比较第一和第二CDAC的输出,第一和第三CDAC的输出电平与参考电平的第一至第三比较器; 算术运算电路; SAR控制电路,其中所述SAR控制电路:在每个步骤中确定在四个范围中的哪一个范围中包括所述第一和第二CDAC的采样和保持的信号的输出电平,与所述转换范围相对应的四个范围被分配, 确定数字数据的两位,并调整第一和第二CDAC的输出电平,使得电压范围的1/4或¾的电平与中间电平一致,并且控制第一和第二开关,使得电压范围被设置为 作为下一步的转换范围。
    • 74. 发明申请
    • SEMICONDUCTOR DEVICE AND COMMUNICATION INTERFACE CIRCUIT
    • 半导体器件和通信接口电路
    • US20150155872A1
    • 2015-06-04
    • US14550725
    • 2014-11-21
    • FUJITSU SEMICONDUCTOR LIMITED
    • Daisuke SUZUKIMasayuki YAMAGUCHI
    • H03K19/0175H03K19/173
    • H03K19/017581H03K19/017509H03K19/1736
    • A communication interface circuit includes a register and a register setting circuit. The register holds a data value for controlling characteristics of an electronic circuit element included in the communication interface circuit. The register setting circuit changes a wire connection state on the basis of a control signal. The register setting circuit inputs a variable data value to the register to detect the data value corresponding to the characteristics of the electronic circuit element in a first wire connection state, and sets the data value detected in the first wire connection state in the register on the basis of a fixed value in a second wire connection state. A control circuit outputs the above control signal.
    • 通信接口电路包括寄存器和寄存器设置电路。 寄存器保持用于控制通信接口电路中包括的电子电路元件的特性的数据值。 寄存器设定电路根据控制信号改变接线状态。 寄存器设定电路向寄存器输入可变数据值,以检测与第一有线连接状态下的电子电路元件的特性对应的数据值,并将在第一线连接状态中检测到的数据值设置在寄存器中 在第二线连接状态下的固定值的基础。 控制电路输出上述控制信号。
    • 76. 发明申请
    • AMPLIFIER
    • 放大器
    • US20150130540A1
    • 2015-05-14
    • US14530028
    • 2014-10-31
    • FUJITSU SEMICONDUCTOR LIMITED
    • Nobumasa HASEGAWA
    • H03F3/45H03F1/02
    • H03F1/0266H03F1/3211H03F3/245H03F3/45475H03F2200/411H03F2200/534H03F2200/537H03F2200/541H03F2200/555H03F2203/45051H03F2203/45112H03F2203/45228H03F2203/45244
    • An amplifier includes a first transformer configured to output first differential signals, a first differential amplifier coupled to the first transformer, a second transformer coupled to the first differential amplifier, a second differential amplifier coupled to the second transformer, a third transformer configured to transform second differential signals output from the second differential amplifier to a single-ended output signal, and a first bias circuit configured to supply a first bias voltage to a first secondary coil of the first transformer, wherein the first bias circuit sets the first bias voltage to a voltage greater than or equal to a first voltage based on the input signal in a first operating area where power of the output signal is greater than or equal to a first power so that power-gain characteristics of the output signal become closer to characteristics where gain of the output signal becomes constant.
    • 放大器包括被配置为输出第一差分信号的第一变压器,耦合到第一变压器的第一差分放大器,耦合到第一差分放大器的第二变压器,耦合到第二变压器的第二差分放大器,被配置为转换第二变换器 差分信号从第二差分放大器输出到单端输出信号,以及第一偏置电路,其被配置为向第一变压器的第一次级线圈提供第一偏置电压,其中第一偏置电路将第一偏置电压设置为 基于在输出信号的功率大于或等于第一功率的第一操作区域中的输入信号的电压大于或等于第一电压,使得输出信号的功率增益特性变得更接近于其中增益 的输出信号变为恒定。