公开(公告)号：US07368974B2

公开(公告)日：2008-05-06

申请号：US11479742

申请日：2006-06-30

Applicant: Takeo Suzuki ,  Shigeru Osada

Inventor： Takeo Suzuki ,  Shigeru Osada

IPC: G06F7/44

CPC classification number: H04L27/3863 ,  H03D3/009

Abstract: A signal adder circuit includes: an adding unit that includes at least a pair of amplification elements in which a constant current flows between ground terminals and a ground, input signals having different phases are input to input terminals, and output terminals to which a power supply voltage is applied are connected to each other; a gain control unit that is provided between the ground and each of the ground terminals of the amplification elements so as to adjust the amplitudes of the input signals having different phases; and a phase control unit that is provided between the ground and each of the ground terminals of the amplification elements so as to adjust the phases of the input signals having different phases.

Abstract translation: 信号加法电路包括：加法单元，其包括至少一对放大元件，其中恒定电流在接地端子和地之间流动，具有不同相位的输入信号被输入到输入端子，以及输出端子，电源 施加电压彼此连接; 增益控制单元，设置在放大元件的接地端子和每个接地端子之间，以便调节具有不同相位的输入信号的幅度; 以及相位控制单元，设置在放大元件的接地端子和每个接地端子之间，以便调节具有不同相位的输入信号的相位。

公开(公告)号：US07209723B2

公开(公告)日：2007-04-24

申请号：US10801370

申请日：2004-03-16

Applicant: Takeo Suzuki ,  Shigeru Osada

Inventor： Takeo Suzuki ,  Shigeru Osada

IPC: H04B1/06

CPC classification number: H03D3/009 ,  H04B1/30

Abstract: A direct conversion circuit includes first and second mixers to which a radio frequency signal is input. An oscillator supplies the first and second mixers with local oscillation signals whose phases are orthogonal to each other. A baseband processing circuit processes baseband signals output from the first and second mixers. A level-difference correcting circuit which corrects the two baseband signals input to the baseband processing circuit so that the levels of both are equal to each other is provided in a stage before the first and second mixers. The levels of the baseband signals are corrected by changing relative levels of the radio frequency signal input to the first mixer and the radio frequency signal input to the second mixer.

Abstract translation: 直接转换电路包括输入射频信号的第一和第二混频器。 振荡器为第一和第二混频器提供相位彼此正交的本地振荡信号。 基带处理电路处理从第一和第二混频器输出的基带信号。 在第一和第二混频器之前的阶段，提供校正输入到基带处理电路的两个基带信号使得两者的电平彼此相等的电平差校正电路。 通过改变输入到第一混频器的射频信号的相对电平和输入到第二混频器的射频信号来校正基带信号的电平。

公开(公告)号：US20070046529A1

公开(公告)日：2007-03-01

申请号：US11479742

申请日：2006-06-30

Applicant: Takeo Suzuki ,  Shigeru Osada

Inventor： Takeo Suzuki ,  Shigeru Osada

IPC: G01S13/00

CPC classification number: H04L27/3863 ,  H03D3/009

Abstract: A signal adder circuit includes: an adding unit that includes at least a pair of amplification elements in which a constant current flows between ground terminals and a ground, input signals having different phases are input to input terminals, and output terminals to which a power supply voltage is applied are connected to each other; a gain control unit that is provided between the ground and each of the ground terminals of the amplification elements so as to adjust the amplitudes of the input signals having different phases; and a phase control unit that is provided between the ground and each of the ground terminals of the amplification elements so as to adjust the phases of the input signals having different phases.

Abstract translation: 信号加法电路包括：加法单元，其包括至少一对放大元件，其中恒定电流在接地端子和地之间流动，具有不同相位的输入信号被输入到输入端子，以及输出端子，电源 施加电压彼此连接; 增益控制单元，设置在放大元件的接地端子和每个接地端子之间，以便调节具有不同相位的输入信号的幅度; 以及相位控制单元，设置在放大元件的接地端子和每个接地端子之间，以便调节具有不同相位的输入信号的相位。

公开(公告)号：US06639630B2

公开(公告)日：2003-10-28

申请号：US09494960

申请日：2000-02-01

Applicant: Shigeru Osada ,  Masaki Yamamoto ,  Yoshihiro Sato

Inventor： Shigeru Osada ,  Masaki Yamamoto ,  Yoshihiro Sato

IPC: H04N544

CPC classification number: H04N5/44 ,  H03J5/244

Abstract: A switch circuit is provided for at least one of a previous stage of a VHF-band frequency converter and a previous stage of a UHF-band frequency converter. Each switch circuit passes a signal when a frequency converter at a subsequent stage of the switch circuit is operating, and does not pass a signal when the frequency converter at the subsequent stage of the switch circuit is not operating.

Abstract translation: 为VHF频带变频器的前一级和UHF频带变频器的前一级中的至少一个提供开关电路。 当开关电路的后续阶段的变频器工作时，每个开关电路通过信号，并且在开关电路的后续阶段的变频器不工作时不通过信号。

公开(公告)号：US06559899B1

公开(公告)日：2003-05-06

申请号：US09598966

申请日：2000-06-21

Applicant: Takao Suzuki ,  Akira Takayama ,  Shigeru Osada

Inventor： Takao Suzuki ,  Akira Takayama ,  Shigeru Osada

IPC: H04N550

CPC classification number: H04N5/4446 ,  H03D3/008 ,  H04N5/4401 ,  H04N5/455 ,  H04N21/4263

Abstract: A digital television tuner is realized in which the construction of a baseband signal processing portion is simple, it is difficult for a local oscillation signal to leak to the input end side, and in which image interference is suppressed. The digital television tuner includes a frequency conversion device for converting the frequency of a digital television signal of a channel to be received from among channels arranged in a predetermined frequency band into the highest frequency of the frequency band or higher; two mixing devices for outputting two baseband signals whose phases are mutually orthogonal to each other by demodulating the frequency-converted digital television signal; a local oscillation device for inputting local oscillation signals whose phases are mutually orthogonal to each other to the two mixing devices; and an addition device for adding together the two baseband signals, wherein the frequency of the local oscillation signals is set to be the same frequency as the frequency at the end of the band in the channel of the frequency-converted digital television signal, and one of the baseband signals is converted into the same phase as that of the other, after which the signals are input to the addition device.

Abstract translation: 实现数字电视调谐器，其中基带信号处理部分的构造简单，本地振荡信号难以泄漏到输入端侧，并且抑制了图像干扰。 数字电视调谐器包括：频率转换装置，用于将布置在预定频带中的频道中的要接收的频道的数字电视信号的频率转换为频带的最高频率; 两个混合装置，用于通过解调频率转换的数字电视信号来输出相位彼此相互正交的两个基带信号; 本地振荡装置，用于输入其相位彼此相互正交的本地振荡信号到两个混合装置; 以及用于将两个基带信号相加在一起的加法装置，其中本地振荡信号的频率被设置为与频率转换的数字电视信号的信道中的频带末端的频率相同的频率，一个 的基带信号被转换成与另一个基带信号相同的相位，之后信号被输入到加法装置。