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    • 1. 发明授权
    • Power amplifier with distortion compensation circuit
    • 具有失真补偿电路的功率放大器
    • US07663436B2
    • 2010-02-16
    • US12000616
    • 2007-12-14
    • Takeshi TakanoYasuyuki OishiToru Maniwa
    • Takeshi TakanoYasuyuki OishiToru Maniwa
    • H03F1/26
    • H03F1/3247H03F1/30H03F1/3282H03F2201/3209H03F2201/3212H03F2201/3224H03F2201/3233
    • A power amplifier negates a memory effect and is applied a linearizer using a digital predistortion system even in an inexpensive device. The power amplifier compares an input signal power against a sampled component of an output power, and provides predistortion to the input signal power so as to minimize a difference as a result of the comparison. The power amplifier comprises a gain lookup table storing a gain coefficient value corresponding to a temperature address determined for an input power; a phase lookup table storing a phase coefficient value corresponding to the temperature address determined for the input power; a transversal filter, which is input with the input power, and which outputs the temperature address; and a coefficient multiplier modulating the input signal using a gain coefficient value and a phase coefficient value, which correspond to the temperature address and which are read out from the gain coefficient lookup table and the phase lookup table.
    • 功率放大器消除了记忆效应,并且即使在廉价的设备中也使用数字预失真系统应用线性化。 功率放大器将输入信号功率与输出功率的采样分量进行比较,并且为输入信号功率提供预失真,以便作为比较的结果使差异最小化。 功率放大器包括:增益查找表,其存储对应于为输入功率确定的温度地址的增益系数值; 相位查找表,存储与为输入功率确定的温度地址对应的相位系数值; 横向滤波器,其输入有输入功率,并输出温度地址; 以及系数乘法器,其使用与所述温度地址对应并且从所述增益系数查找表和所述相位查找表读出的增益系数值和相位系数值来调制所述输入信号。
    • 4. 发明申请
    • Power amplifier with distortion compensation circuit
    • 具有失真补偿电路的功率放大器
    • US20080094139A1
    • 2008-04-24
    • US12000616
    • 2007-12-14
    • Takeshi TakanoYasuyuki OishiToru Maniwa
    • Takeshi TakanoYasuyuki OishiToru Maniwa
    • H03F1/26
    • H03F1/3247H03F1/30H03F1/3282H03F2201/3209H03F2201/3212H03F2201/3224H03F2201/3233
    • A power amplifier negates a memory effect and is applied a linearizer using a digital predistortion system even in an inexpensive device. The power amplifier compares an input signal power against a sampled component of an output power, and provides predistortion to the input signal power so as to minimize a difference as a result of the comparison. The power amplifier comprises a gain lookup table storing a gain coefficient value corresponding to a temperature address determined for an input power; a phase lookup table storing a phase coefficient value corresponding to the temperature address determined for the input power; a transversal filter, which is input with the input power, and which outputs the temperature address; and a coefficient multiplier modulating the input signal using a gain coefficient value and a phase coefficient value, which correspond to the temperature address and which are read out from the gain coefficient lookup table and the phase lookup table.
    • 功率放大器消除了记忆效应,并且即使在廉价的设备中也使用数字预失真系统应用线性化。 功率放大器将输入信号功率与输出功率的采样分量进行比较,并且为输入信号功率提供预失真,以便作为比较的结果使差异最小化。 功率放大器包括:增益查找表,其存储对应于为输入功率确定的温度地址的增益系数值; 相位查找表,存储与为输入功率确定的温度地址对应的相位系数值; 横向滤波器,其输入有输入功率,并输出温度地址; 以及系数乘法器,其使用与所述温度地址对应并且从所述增益系数查找表和所述相位查找表读出的增益系数值和相位系数值来调制所述输入信号。
    • 10. 发明授权
    • Distortion compensation apparatus
    • 失真补偿装置
    • US06737918B2
    • 2004-05-18
    • US10629134
    • 2003-07-29
    • Yasuyuki OishiTokuro KuboKazuo NagataniToru Maniwa
    • Yasuyuki OishiTokuro KuboKazuo NagataniToru Maniwa
    • H03F126
    • H03F1/3247H03F1/3282H03F1/3294H03F1/34H03F3/24H04B2001/0433H04L27/368
    • An input complex base band signal x(t) is complex-multiplied by a distortion compensation coefficient h(p), quadrature-modulated by a quadrature modulator QMOD, and input into a power amplifier AMP. A part of the output from the power amplifier AMP is input into a band pass filter BPF, the band pass filter BPF extracts an adjacent channel leakage power band, and a power detector detects an adjacent channel leakage power value. A distortion compensation coefficient arithmetic unit GA using a genetic algorithm computes a distortion compensation coefficient based on an adjacent channel leakage power value on an adjacent channel leakage power ratio and an input complex base band signal x(t), and outputs a distortion compensation coefficient h(p) as a function of a power value p of the input complex base band signal.
    • 输入复基带信号x(t)被正交调制器QMOD正交调制的失真补偿系数h(p)复乘,并输入到功率放大器AMP。 来自功率放大器AMP的输出的一部分被输入到带通滤波器BPF中,带通滤波器BPF提取相邻信道泄漏功率带,并且功率检测器检测相邻信道泄漏功率值。 使用遗传算法的失真补偿系数算术单元GA根据相邻信道泄漏功率比的相邻信道泄漏功率值和输入复基带信号x(t)计算失真补偿系数,并输出失真补偿系数h (p)作为输入复基带信号的功率值p的函数。