公开(公告)号：US20030174019A1

公开(公告)日：2003-09-18

申请号：US10303800

申请日：2002-11-26

Applicant: Hitachi Kokusai Electric Inc.

Inventor： Masaki Suto ,  Yoichi Okubo ,  Toshio Takada ,  Naoki Hongo

IPC: H03F001/26

CPC classification number: H03F1/3247 ,  H03F1/3282 ,  H03F1/3288

Abstract: A distortion compensation amplification apparatus for compensating distortion generated while amplifying a signal, includes a distributor for distributing an input signal to provide a first and a second outputs, a first delay means for delaying the first output through the use of a surface acoustic wave element, a compensation value generation circuit, responsive to the second output, for determining amplitude and phase compensation values to be used in compensating the distortion, a second delay means for delaying the compensation values according to a delay time of the first delay means, and a predistortion circuit for compensating the output of the first delay means in response to the delayed compensation values. And the second delay means includes at least one type of circuit among the type of an analog delay circuit and a digital delay circuit.

Abstract translation: 一种用于补偿放大信号时产生的失真的失真补偿放大装置，包括用于分配输入信号以提供第一和第二输出的分配器，用于通过使用表面声波元件延迟第一输出的第一延迟装置， 响应于所述第二输出的补偿值生成电路，用于确定用于补偿所述失真的幅度和相位补偿值;第二延迟装置，用于根据所述第一延迟装置的延迟时间来延迟所述补偿值;以及预失真 电路，用于响应延迟的补偿值补偿第一延迟装置的输出。 并且第二延迟装置包括模拟延迟电路的类型和数字延迟电路中的至少一种类型的电路。

公开(公告)号：US20030085762A1

公开(公告)日：2003-05-08

申请号：US10253972

申请日：2002-09-25

Applicant: Hitachi Kokusai Electric Inc.

Inventor： Toshio Takada ,  Yoichi Okubo ,  Masaki Suto ,  Masato Horaguchi ,  Naoki Hongo

IPC: H03F001/26

CPC classification number: H03F1/3282

Abstract: A distortion compensation circuit reduces an unbalance between higher and lower 3rd order distortions, the distortions being generated by an amplifier which amplifies an input signal having at least two frequency components. Amplitude modulation means, which includes an amplitude detector, an amplitude circuit, a phase circuit and another amplitude circuit, generates sideband signals corresponding to an instantaneous phase difference between the higher and lower 3rd order distortions, such that distortions generated by the amplifier can be cancelled. Further, sideband signal generating means, which includes an amplitude circuit, a delay circuit, an AM modulator, another amplitude circuit, another delay circuit and a PM modulator, performs AM and PM on the input signal to thereby generate sideband signals, such that distortions generated by the amplifier can be cancelled.

Abstract translation: 失真补偿电路减少了较高和较低三阶失真之间的不平衡，失真是由放大具有至少两个频率分量的输入信号的放大器产生的。 幅度调制装置包括振幅检测器，振幅电路，相位电路和另一幅度电路，产生对应于较高和较低三阶失真之间的瞬时相位差的边带信号，从而可以消除由放大器产生的失真 。 此外，包括幅度电路，延迟电路，AM调制器，另一幅度电路，另一延迟电路和PM调制器的边带信号发生装置在输入信号上执行AM和PM，从而产生边带信号，使得失真 由放大器产生的可以取消。

公开(公告)号：US20030085761A1

公开(公告)日：2003-05-08

申请号：US10153630

申请日：2002-05-24

Applicant: Hitachi Kokusai Electric Inc.

Inventor： Yoichi Okubo ,  Kiyoshi Funada ,  Masaki Suto ,  Masato Horaguchi ,  Toshio Takada ,  Naoki Hongo

IPC: H03F001/26

CPC classification number: H03F1/3229 ,  H03F1/32 ,  H03F1/3247 ,  H03F2200/102 ,  H03F2201/3206

Abstract: A distortion reducing circuit compensates an upper side third-order distortion and a lower side third-order distortion produced by an amplifier for amplifying a fundamental signal including multiple frequency components. The distortion reducing circuit includes a second harmonic reflection coefficient regulation circuit, installed at an output side of the amplifier, for regulating reflection coefficients for multiple frequency components included in a second harmonic signal to have a constant value.

Abstract translation: 失真减小电路补偿由用于放大包括多个频率分量的基本信号的放大器产生的上侧三阶失真和下侧三次失真。 失真减小电路包括安装在放大器的输出侧的二次谐波反射系数调节电路，用于调节包括​​在二次谐波信号中的多个频率分量的反射系数以具有恒定值。

公开(公告)号：US20030022639A1

公开(公告)日：2003-01-30

申请号：US10205563

申请日：2002-07-26

Applicant: Hitachi Kokusai Electric Inc.

Inventor： Naoki Hongo ,  Yoichi Okubo ,  Masaki Suto ,  Masato Horaguchi ,  Toshio Takada ,  Tetsuhiko Miyatani

IPC: H04B001/04 ,  H01Q011/12 ,  H04B007/00 ,  H04Q007/20

CPC classification number: H03G11/04 ,  H04L27/2623

Abstract: A peak limiter for use in a system for amplifying a multi-carrier signal receives a baseband signal of each carrier of the multi-carrier signal. The multi-carrier signal is computationally estimated to have carriers combined in an RF band, and obtains power information of the multi-carrier signal to limit an amplitude of the baseband signal based on the power information of the estimated multi-carrier signal to thereby provide peak-limited baseband signals. Thus, the distortion generated by performing the unnecessary peak limitation can be effectively prevented to thereby improve the reliability of the entire system.

Abstract translation: 用于放大多载波信号的系统中的峰值限制器接收多载波信号的每个载波的基带信号。 计算地估计多载波信号使载波组合在RF频带中，并且基于估计的多载波信号的功率信息获得多载波信号的功率信息以限制基带信号的幅度，从而提供 峰值限制基带信号。 因此，可以有效地防止通过执行不必要的峰值限制而产生的失真，从而提高整个系统的可靠性。

公开(公告)号：US20020180523A1

公开(公告)日：2002-12-05

申请号：US10131131

申请日：2002-04-25

Applicant: Hitachi Kokusai Electric Inc.

Inventor： Yoichi Okubo ,  Kiyoshi Funada ,  Masaki Suto ,  Masato Horaguchi ,  Toshio Takada ,  Naoki Hongo

IPC: H03F001/26

CPC classification number: H03F1/3247 ,  H03F1/3205 ,  H03F1/3282 ,  H03F1/3288 ,  H03F2200/102 ,  H03F2201/3206 ,  H03F2201/3233

Abstract: There is provided a distortion canceling circuit for reducing an unbalance between a higher and a lower 3rd order distortion at frequencies of (2nullf2nullf1) and (2nullf1nullf2), respectively, the distortions being generated by an amplifier which amplifies an input signal having at least two frequency components, i.e., f1 and f2. Phase modulation control means supply a control signal, which has a difference frequency of (f2nullf1), to phase modulation means, the control signal being generated based on the amplified input signal outputted from the amplifier. The phase modulation means performs phase modulation on the amplified input signal based on the supplied control signal to thereby generate a higher and a lower side-band signal having frequencies of (2nullf2nullf1) and (2nullf1nullf2), respectively, each of which has an identical amplitude and a phase difference of 180null with respect to each other. The distortion canceling circuit reduces the unbalance by using the side-band signals.

Abstract translation: 提供了一种用于减小在（2.f2-f1）和（2.f1-f2）频率处的较高和较低三阶失真之间的不平衡的失真消除电路，失真是由放大器 具有至少两个频率分量的输入信号，即f1和f2。 相位调制控制装置将具有差分频率（f2-f1）的控制信号提供给相位调制装置，该控制信号是根据从放大器输出的放大的输入信号产生的。 相位调制装置基于所提供的控制信号对放大的输入信号执行相位调制，从而分别产生频率为（2.f2-f1）和（2.f1-f2）的较高和较低的边带信号 ，其中的每一个具有相同的振幅和相对于彼此为180°的相位差。 失真消除电路通过使用边带信号来减少不平衡。