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    • 1. 发明专利
    • High-frequency amplifier
    • 高频放大器
    • JP2013229660A
    • 2013-11-07
    • JP2012098855
    • 2012-04-24
    • Mitsubishi Electric Corp三菱電機株式会社
    • INAGAKI RYUJITSURU MASAOMITANIGUCHI EIJI
    • H03F1/12H03F3/19H03F3/21H03F3/68
    • PROBLEM TO BE SOLVED: To provide a high-frequency amplifier capable of improving a stabilization index by attenuating an unnecessary frequency band without degrading an input or output impedance even when the input or output impedance of a transistor is originally low.SOLUTION: The high-frequency amplifier includes an electric field effect transistor 1 whose source terminal 1a is grounded, and a stabilization circuit 2 in which a first terminal 21 is connected with the gate terminal 1b of the electric field effect transistor 1. The stabilization circuit 2 includes a second capacitor 7 connected between a second terminal 52 and a third terminal 53 of a T-type attenuator circuit 5. The second terminal 52 and a third terminal 53 of the T-type attenuator circuit 5 are connected with the gate terminal 1b and the input terminal 3 of the electric field effect transistor 1, respectively.
    • 要解决的问题:提供一种即使当晶体管的输入或输出阻抗原本较低时也能通过衰减不必要频带而不降低输入或输出阻抗来提高稳定指标的高频放大器。解决方案: 高频放大器包括其源极端子1a接地的电场效应晶体管1和稳定电路2,其中第一端子21与电场效应晶体管1的栅极端子1b连接。稳定电路2包括第二电容器 连接在T型衰减器电路5的第二端子52和第三端子53之间.T型衰减器电路5的第二端子52和第三端子53与栅极端子1b和输入端子3连接 的电场效应晶体管1。
    • 2. 发明专利
    • Frequency domain equalization circuit and control method of frequency domain equalization circuit
    • 频域均衡电路和频域均衡电路的控制方法
    • JP2014086912A
    • 2014-05-12
    • JP2012234918
    • 2012-10-24
    • Mitsubishi Electric Corp三菱電機株式会社Tohoku Univ国立大学法人東北大学
    • KOMATSU KAZUHIROKAMEDA TAKUSUEMATSU KENJITAKAGI SUNAOTSUBOUCHI KAZUOINAGAKI RYUJITSURU MASAOMITANIGUCHI EIJI
    • H04B7/005H03H17/02H03H21/00H04B3/10H04J11/00
    • PROBLEM TO BE SOLVED: To obtain a frequency domain equalization circuit in which the numbers of packaging circuits of FFT circuits and IFFT circuits are reduced within such a range that desired throughput can be achieved.SOLUTION: The frequency domain equalization circuit comprises: a channel estimation circuit which estimates a channel with frequency distortion while including one FFT/IFFT duplexer circuit, at N points (N is a positive integer) for channel estimation, in which selectors are connected at an input side and an output side and input and output can be switched, respectively; a data equalization circuit which performs equalization processing of a data signal in accordance with noise of a channel estimated by the channel estimation circuit while including one FFT circuit at M points (M is a positive integer and N≤M) for data equalization and one IFFT circuit at M points for data equalization in which selectors are connected at an input side and an output side and input and output can be switched, respectively; and a control section which connects the selectors and performs switching control on switching of FFT and IFFT in the FFT/IFFT duplexer circuit.
    • 要解决的问题:获得频域均衡电路,其中FFT电路和IFFT电路的封装电路的数量在可以实现期望的吞吐量的范围内减小。解决方案:频域均衡电路包括:信道估计 在包括一个FFT / IFFT双工器电路的频率失真的信道中,在用于信道估计的N个点(N是正整数)处,其中选择器连接在输入侧,输入端和输入端可以是 分别切换; 一种数据均衡电路,其根据由信道估计电路估计的信道的噪声执行数据信号的均衡处理,同时包括用于数据均衡的M个点(M为正整数和N≤M)的一个FFT电路和一个IFFT 在M点的电路分别用于数据均衡,其中选择器连接在输入侧,输出端和输入和输出分别被切换; 以及连接选择器的控制部,对FFT / IFFT双工器电路中的FFT和IFFT的切换进行切换控制。
    • 3. 发明专利
    • 周波数変換器
    • JP2020010193A
    • 2020-01-16
    • JP2018129885
    • 2018-07-09
    • MITSUBISHI ELECTRIC CORP
    • YOKOYAMA AKIOINAGAKI RYUJI
    • H01P5/10H03D7/00H03D7/14
    • 【課題】大型化を抑制して同相抑制機能を有した周波数変換器を得る。【解決手段】周波数変換器は、周波数変換回路と、第1,第2の入力端子と入力される信号の中心周波数に対応する波長の1/4波長の電気長である第1、第2、第3、第4、第5および第6の線路とを有する同相除去回路とを備え、第1の線路の一端は第1の入力端子に接続され、第2の線路の一端は接地されて他端は第1の高周波入力端子4aに接続され、第3の線路の一端は開放され、第4の線路の一端は第1の線路の他端に接続されて他端は開放され、第5の線路の一端は第2の高周波入力端子4bに接続されて他端は接地され、第6の線路の一端は第3の線路の他端に接続されて他端は第2の入力端子に接続され、第1の線路と第2の線路とが電磁的に結合し、第2の線路と第3の線路とが電磁的に結合し、第4の線路と第5の線路とが電磁的に結合し、第5の線路と第6の線路とが電磁的に結合している。【選択図】図1
    • 4. 发明专利
    • Reception device and reception method
    • 接收设备和接收方法
    • JP2014192807A
    • 2014-10-06
    • JP2013068359
    • 2013-03-28
    • Mitsubishi Electric Corp三菱電機株式会社Tohoku Univ国立大学法人東北大学
    • TA TUAN THANHKAMEDA TAKUSUEMATSU KENJITAKAGI SUNAOTSUBOUCHI KAZUOINAGAKI RYUJITSURU MASAOMITANIGUCHI EIJI
    • H04B7/08H04L27/22
    • Y02D70/00Y02D70/442Y02D70/444
    • PROBLEM TO BE SOLVED: To provide a reception device and a reception method capable of reducing costs, power consumption and signal processing amount.SOLUTION: A reception device comprises: a plurality of LPF 21, installed in association with I channel signals and Q channel signals to be output from a plurality of BB phase shifters 13, for allowing only low frequency components of a predetermined frequency or less to pass; a plurality of low speed ADC 22, respectively connected to the plurality of LPF 21, for converting the I channel signals and the Q channel signals of the low frequency components into digital signals; and a DSP 23 for extracting a phase difference between a plurality of antenna elements from the outputs of the plurality of low speed ADC 22, and for controlling the plurality of BB phase shifters 13 such that the phases of the I channel signals and the Q channel signals to be output from the plurality of BB phase shifters 13 are aligned.
    • 要解决的问题:提供能够降低成本,功耗和信号处理量的接收装置和接收方法。解决方案:接收装置包括:多个LPF 21,其与I信道信号和Q信道信号相关联地安装 从多个BB移相器13输出,仅允许预定频率或更小频率的低频分量通过; 分别连接到多个LPF21的多个低速ADC22,用于将低频分量的I信道信号和Q信道信号转换为数字信号; 以及DSP23,用于从多个低速ADC22的输出中提取多个天线元件之间的相位差,并且用于控制多个BB移相器13,使得I通道信号和Q通道的相位 从多个BB移相器13输出的信号被对准。