公开(公告)号：JP2007129492A

公开(公告)日：2007-05-24

申请号：JP2005320147

申请日：2005-11-02

申请人： Japan Radio Co Ltd ,  日本無線株式会社

发明人： KASHIMURA KAZUNORI ,  YAMASHITA KAZUO ,  TAKAHASHI HIDENORI

IPC分类号： H03F1/32 ,  H03F1/07 ,  H03F1/30

摘要： PROBLEM TO BE SOLVED: To improve a distortion compensation effect by means of predistortion even when input/output characteristics of an amplifier change with time, temperature, or the like.
SOLUTION: A predistortion arithmetic section 46 updates predistortion characteristics stored in a predistortion characteristics so that a distortion component remaining in the output signal from the amplifier 12 decreases in level. A predistortion compensation section 16 imparts predistortion to an input signal to the amplifier 12 by reference to a look-up table in the predistortion characteristics storage section 48. An amplifier characteristic control section 50 controls input/output characteristics of the amplifier 12 by controlling a gate bias voltage supplied to the amplifier 12 so that characteristic differences between current predistortion characteristics and predistortion characteristics in an initial state decrease.
COPYRIGHT: (C)2007,JPO&INPIT

摘要翻译： 要解决的问题：即使当放大器的输入/输出特性随时间，温度等变化时，也可通过预失真来提高失真补偿效果。 解决方案：预失真运算部分46更新存储在预失真特性中的预失真特性，使得剩余在来自放大器12的输出信号中的失真分量降低。 预失真补偿部分16通过参考预失真特性存储部分48中的查找表将预失真输入到放大器12的输入信号。放大器特性控制部分50通过控制门极来控制放大器12的输入/输出特性 提供给放大器12的偏置电压，使得初始状态下的电流预失真特性和预失真特性之间的特征差减小。 版权所有（C）2007，JPO＆INPIT

公开(公告)号：JP2006033485A

公开(公告)日：2006-02-02

申请号：JP2004210254

申请日：2004-07-16

申请人： Japan Radio Co Ltd ,  日本無線株式会社

发明人： KASHIMURA KAZUNORI ,  YAMASHITA KAZUO ,  TAKAHASHI HIDENORI ,  ADACHI MASAYUKI ,  KIMURA JUICHIRO ,  YODA TAMAKI ,  OGUCHI NOBUTAKA

IPC分类号： H03F1/32

摘要： PROBLEM TO BE SOLVED: To provide a feed-forward amplifier which can sharply raise improvement effect of power efficiency.
SOLUTION: A distortion removal control circuit 41 creates distortion removal control voltage for mostly converging distortion component power of low distortion output signals at an output terminal 16 to the minimum level. An output power control circuit 42 creates output power control voltage for mostly converging consumption power in a dummy load 14 to the minimum level. The distortion removal control voltage controls gain of an amplitude adjusting circuit 2 and a phase shift amount of a phase adjustment circuit 4, and controls voltage which is a sum added the distortion removal control voltage to the output power control voltage with weight, controls gain of an amplitude adjustment circuit 8 and a phase shift amount of a phase adjustment circuit 9.
COPYRIGHT: (C)2006,JPO&NCIPI

摘要翻译： 要解决的问题：提供一种可以大大提高功率效率的提高效果的前馈放大器。 解决方案：失真消除控制电路41产生用于将输出端子16处的低失真输出信号的失真分量功率大部分收敛到最小电平的失真消除控制电压。 输出功率控制电路42将用于将虚拟负载14中的消耗功率大部分收敛的输出功率控制电压形成为最小电平。 失真去除控制电压控制幅度调整电路2的增益和相位调整电路4的相位偏移量，并且控制将失真消除控制电压与输出功率控制电压的重量相加的电压，控制增益 幅度调整电路8和相位调整电路9的相位偏移量。（C）2006年，JPO和NCIPI

公开(公告)号：JP2000165203A

公开(公告)日：2000-06-16

申请号：JP33959698

申请日：1998-11-30

申请人： JAPAN RADIO CO LTD

发明人： TONAMI YOSHIYUKI ,  KASHIMURA KAZUNORI

IPC分类号： H03H11/32

摘要： PROBLEM TO BE SOLVED: To obtain an active balun circuit by which outputs with the same amplitude and a different phase by 180 degrees can be obtained stably from each output port even at a microwave frequency band. SOLUTION: An input port 1 is connected to a gate of a 1st FET (existing FET) 10 in this active balun circuit, a short-circuit section between a gate and a source of a 2nd FET 11 and a 1st output port 2 via a 1st capacitor C1 are connected in parallel with the drain side, a drain of a 3rd FET 12 and a 2nd output port 3 via a 2nd capacitor C2 are connected in parallel with the source side, a 3rd resistor R3 whose one terminal connects to ground is connected in parallel with the gate, a terminal applying a drain voltage VD is connected to the drain of the 2nd FET 11, the short-circuit section between the gate and the source of the 3rd FET 12 connects to ground, and a transmission line 4 for adjusting a phase difference is interposed between the 2nd capacitor C2 and the 2nd output port 3.