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1. 发明授权

US08554160B2 AM transmitter and modulation method using same 有权
标题翻译： AM发射机和调制方法使用相同
公开(公告)号：US08554160B2
公开(公告)日：2013-10-08
申请号：US12130709
申请日：2008-05-30
申请人： Shin-ichi Matsuo , Hirokazu Iwata , Fuminori Kinugawa
发明人： Shin-ichi Matsuo , Hirokazu Iwata , Fuminori Kinugawa
IPC分类号： H03C1/52 , H01Q11/12 , H04B1/04
CPC分类号： H03C1/36
摘要： An AM (Amplitude-Modulated) transmitter capable of improving modulation distortion is provided. An adder adds a modulation signal to a pre-set power reference signal. An APC (Automatic Power Control) amplifier compares a level of a detecting signal outputted by the LPF (Low Pass Filter) with a level of an adder signal. The APC amplifier, based on the comparison result, generates a gain controlling signal that makes a difference between a level of the detecting signal and level of the signal approach zero and feeds the gain controlling signal to a power amplifier. The power amplifier modulates the signal outputted from the amplifier by the gain controlling signal and power-amplifies the modulated signal according to a level of the gain controlling signal. Since the APC amplifier feeds the gain controlling signal to the power amplifier, a modulation degree does not depend on a nonlinear distortion characteristic of the power amplifier.
摘要翻译：提供能够改善调制失真的AM（调幅调制）发射机。加法器将调制信号加到预设的功率参考信号上。 APC（自动功率控制）放大器将由LPF（低通滤波器）输出的检测信号的电平与加法器信号的电平进行比较。基于比较结果的APC放大器产生增益控制信号，其使得检测信号的电平和信号的电平接近零之间的差异，并将增益控制信号馈送到功率放大器。功率放大器通过增益控制信号来调制从放大器输出的信号，并根据增益控制信号的电平对调制信号进行功率放大。由于APC放大器将增益控制信号馈送到功率放大器，调制度不取决于功率放大器的非线性失真特性。

2. 发明申请

US20090111396A1 AM TRANSMITTER AND MODULATION METHOD USING SAME 有权
标题翻译： AM发射机和使用相同的调制方法
公开(公告)号：US20090111396A1
公开(公告)日：2009-04-30
申请号：US12130709
申请日：2008-05-30
申请人： Shin-ichi Matsuo , Hirokazu Iwata , Fuminori Kinugawa
发明人： Shin-ichi Matsuo , Hirokazu Iwata , Fuminori Kinugawa
IPC分类号： H04B1/02
CPC分类号： H03C1/36
摘要： An AM (Amplitude-Modulated) transmitter capable of improving modulation distortion is provided. An adder adds a modulation signal to a pre-set power reference signal. An APC (Automatic Power Control) amplifier compares a level of a detecting signal outputted by the LPF (Low Pass Filter) with a level of an adder signal. The APC amplifier, based on the comparison result, generates a gain controlling signal that makes a difference between a level of the detecting signal and level of the signal approach zero and feeds the gain controlling signal to a power amplifier. The power amplifier modulates the signal outputted from the amplifier by the gain controlling signal and power-amplifies the modulated signal according to a level of the gain controlling signal. Since the APC amplifier feeds the gain controlling signal to the power amplifier, a modulation degree does not depend on a nonlinear distortion characteristic of the power amplifier.
摘要翻译：提供能够改善调制失真的AM（调幅调制）发射机。加法器将调制信号加到预设的功率参考信号上。 APC（自动功率控制）放大器将由LPF（低通滤波器）输出的检测信号的电平与加法器信号的电平进行比较。基于比较结果的APC放大器产生增益控制信号，其使得检测信号的电平和信号的电平接近零之间的差异，并将增益控制信号馈送到功率放大器。功率放大器通过增益控制信号来调制从放大器输出的信号，并根据增益控制信号的电平对调制信号进行功率放大。由于APC放大器将增益控制信号馈送到功率放大器，调制度不取决于功率放大器的非线性失真特性。

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