公开(公告)号：US5263180A

公开(公告)日：1993-11-16

申请号：US637131

申请日：1991-01-03

申请人： Eiichi Hirayama ,  Isamu Umino

发明人： Eiichi Hirayama ,  Isamu Umino

IPC分类号： H04B7/08 ,  H04B17/02

CPC分类号： H04B7/084

摘要： In a space diversity reception system, a plurality of receiving circuits, each of which is connected to respective antenna, outputs a first type signal having a level which varies in accordance with the radio frequency signal level input to the receiving circuit. An automatic gain-controlled amplifier amplifies the first type signal so as to output a second type signal having a substantially constant level. A phase control circuit detects a phase difference between the second type signal output from each of the automatic gain-controlled amplifiers and controls the phase difference in each of the first type signals to be null. A combining circuit combines the signals, whose levels are respectively following the input radio frequency signal levels, picked up from each of an inter-stage in the receiving circuits, an output of the combining circuit is the output of the space diversity system. This circuit configuration allows an employment of a less expensive automatic gain-controlled amplifier requiring less severe characteristics. Thus, a circuit for adjusting the input levels to the combining circuit can be avoided, accordingly, a multi-level quadrature amplitude modulation signal having amplitude-modulated component can be received.

摘要翻译： 在空间分集接收系统中，连接到各个天线的多个接收电路输出具有根据输入到接收电路的射频信号电平而变化的电平的第一类型信号。 自动增益控制放大器放大第一类型信号，以输出具有基本恒定电平的第二类型信号。 相位控制电路检测从每个自动增益控制放大器输出的第二类型信号之间的相位差，并将每个第一类型信号中的相位差控制为零。 组合电路将电平分别跟随在接收电路中的每一级的输入射频信号电平的信号组合，组合电路的输出是空间分集系统的输出。 该电路配置允许使用较不昂贵的自动增益控制放大器，其需要较不严格的特性。 因此，可以避免用于调整组合电路的输入电平的电路，因此可以接收具有幅度调制分量的多电平正交幅度调制信号。

公开(公告)号：US4538121A

公开(公告)日：1985-08-27

申请号：US452922

申请日：1982-12-27

申请人： Yasuhiro Yano ,  Isamu Umino ,  Zenichi Ohsawa ,  Takayuki Ozaki

发明人： Yasuhiro Yano ,  Isamu Umino ,  Zenichi Ohsawa ,  Takayuki Ozaki

IPC分类号： H03B19/18 ,  H03L7/06 ,  H03L7/08 ,  H03L7/16 ,  H03L7/20 ,  H03B1/00

CPC分类号： H03L7/0805 ,  H03B19/18 ,  H03L7/06 ,  H03L7/08 ,  H03L7/16 ,  H03L2207/10 ,  H03L7/20 ,  Y10S331/02

摘要： A high frequency generator including a frequency generator and a multiplier, the multiplier including a diode, which multiplies the output frequency of the frequency generator, and shuts off or reduces an output by suspending or suppressing the multiplying operation through the control of a bias voltage applied to the diode used in the multiplier. The system for cutting off the output by controlling the multiplier is very effective for simplifying the circuit structure and reliably turning off the output.

摘要翻译： 一种包括频率发生器和乘法器的高频发生器，该乘法器包括一个二极管，该二极管将频率发生器的输出频率相乘，并通过暂停或抑制施加的偏置电压的乘法运算来关闭或减少输出 到乘法器中使用的二极管。 通过控制乘法器来切断输出的系统对于简化电路结构并可靠地关闭输出非常有效。

公开(公告)号：US5021757A

公开(公告)日：1991-06-04

申请号：US441780

申请日：1989-11-27

申请人： Fumihiko Kobayashi ,  Isamu Umino

发明人： Fumihiko Kobayashi ,  Isamu Umino

IPC分类号： H01P1/203 ,  H01P7/08

CPC分类号： H01P1/20336 ,  H01P1/20381

摘要： A band pass filter is comprised of one or more filter units each having a V-shaped microwave strip line provided with two variable capacity elements at its two open ends and a high frequency elimination element connected to the apex thereof through which a control voltage for the variable capacity elements is applied.

公开(公告)号：US5477187A

公开(公告)日：1995-12-19

申请号：US150087

申请日：1994-04-22

申请人： Fumihiko Kobayashi ,  Isamu Umino ,  Yoshiyasu Tsuruoka ,  Junichi Hasegawa ,  Toshiaki Suzuki ,  Tomohiro Nakamura ,  Teruhiko Kitazawa ,  Mitsunori Hanaka

发明人： Fumihiko Kobayashi ,  Isamu Umino ,  Yoshiyasu Tsuruoka ,  Junichi Hasegawa ,  Toshiaki Suzuki ,  Tomohiro Nakamura ,  Teruhiko Kitazawa ,  Mitsunori Hanaka

IPC分类号： H03F1/32 ,  H03F1/26

CPC分类号： H03F1/3235 ,  H03F1/3229 ,  H03F2201/3212

摘要： In a feed forward amplifier, an RF amplifier is supplied with an input RF signal at an input terminal for amplifying the same; a distortion extraction loop supplied with the input RF signal and further with the output RF signal from the RF amplifier is for extracting non-linear distortion components formed in the output RF signal as a result of amplification in the RF amplifier; a variable phase shifter is provided in the distortion extraction loop for varying a phase of the input RF signal; a variable attenuator is provided in the distortion extraction loop for attenuating an amplitude of the input RF signal that has been supplied to the distortion extraction loop; and a distortion extraction circuit is provided in the distortion extraction loop for producing a distortion output signal that includes non-linear components; further, a control circuit is supplied with the input signal and with the distortion output signal for extracting a main signal component contained in the distortion output signal. The control circuit controls the variable phase shifter and the variable attenuator such that a ratio of the main signal component level with respect to the input RF signal level is decreased.

摘要翻译： PCT No.PCT / JP93 / 00313 Sec。 371日期1994年04月22日 102（e）1994年4月22日PCT 1993年3月17日PCT公布。 第WO93 / 19521号公报 日期为1993年9月30日。在前馈放大器中，RF放大器在输入端提供输入RF信号以进行放大; 提供有输入RF信号的失真提取回路以及来自RF放大器的输出RF信号，用于提取在RF放大器中放大的结果，在输出RF信号中形成的非线性失真分量; 在所述失真提取环路中提供可变移相器，用于改变所述输入RF信号的相位; 在所述失真提取环路中提供可变衰减器，用于衰减已经提供给所述失真提取回路的输入RF信号的幅度; 并且在所述失真提取回路中提供失真提取电路，用于产生包括非线性分量的失真输出信号; 此外，控制电路被提供有输入信号和用于提取包含在失真输出信号中的主信号分量的失真输出信号。 控制电路控制可变移相器和可变衰减器，使得主信号分量电平相对于输入RF信号电平的比率降低。

公开(公告)号：US4509208A

公开(公告)日：1985-04-02

申请号：US482300

申请日：1983-04-05

申请人： Hiroyuki Sogo ,  Zenichi Ohsawa ,  Isamu Umino ,  Haruki Nishida

发明人： Hiroyuki Sogo ,  Zenichi Ohsawa ,  Isamu Umino ,  Haruki Nishida

IPC分类号： H03D7/14 ,  H03D7/16 ,  H03D9/06 ,  H04B1/26

CPC分类号： H03D7/1408 ,  H03D9/0633 ,  H03D2200/0005 ,  H03D2200/009 ,  H03D7/165

摘要： A frequency conversion unit comprising a local oscillator, first and second mixers, first and second hybrid circuits. The mixers receive, via the first hybrid circuit, local oscillation outputs from the local oscillator, and the second hybrid circuit receives outputs from the first and second mixers, producing a frequency conversion output signal therefrom. Intermediate frequency signals used in the first and second mixers are .pi. radians out of phase with each other. The first hybrid circuit produces outputs for the first and second mixers having a predetermined phase difference of .phi..sub.1 therebetween. The second hybrid circuit receives outputs from the first and second mixers and combines them after making a phase difference of (.pi.-.phi..sub.1) therebetween.

摘要翻译： 一种变频单元，包括本地振荡器，第一和第二混频器，第一和第二混合电路。 混频器通过第一混合电路接收来自本地振荡器的本地振荡输出，第二混合电路接收来自第一和第二混频器的输出，从而产生频率转换输出信号。 在第一和第二混合器中使用的中频信号是彼此异相的pi弧度。 第一混合电路产生第一和第二混频器的输出，它们之间具有预定的phi 1相位差。 第二混合电路接收来自第一和第二混频器的输出，并在它们之间产生（pi-phi 1）的相位差之后将它们组合。