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公开(公告)号：US07071752B2
公开(公告)日：2006-07-04
申请号：US10768365
申请日：2004-01-29
申请人： Venkateswar R. Kowkutla , Shifeng Zhao , Luis E. Ossa , Kenneth M. Bell , Anker Josefsen , Lars Risbo
发明人： Venkateswar R. Kowkutla , Shifeng Zhao , Luis E. Ossa , Kenneth M. Bell , Anker Josefsen , Lars Risbo
IPC分类号： G06F1/04
CPC分类号： H03M7/3008 , H03F3/2171 , H03F3/2173 , H03M7/3042
摘要： A digital amplifier includes a noise shaper and a dither generator arranged to introduce noise to the shaper. The generator uses a seed value derived from a state variable of the shaper.
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公开(公告)号：US07809346B2
公开(公告)日：2010-10-05
申请号：US11118831
申请日：2005-04-29
申请人： Lars Risbo , Luis E. Ossa
发明人： Lars Risbo , Luis E. Ossa
IPC分类号： H04B1/10
CPC分类号： H03F3/217
摘要： A digital audio system including a digital audio amplifier with reduced AM interference. The digital audio amplifier includes a pulse-width-modulation (PWM) processor in which a digital datastream is upsampled by an interpolation filter. A sample rate converter resamples the upsampled datastream to produce a datastream at a converted sampling frequency, or PWM frame rate. The converted datastream is then applied to pulse-width-modulation circuitry which generates a PWM signal at the PWM frame rate. The sample rate converter resamples according to a sample rate conversion ratio associated with the AM tuned frequency. For example, the sample rate conversion ratio can be selected so that the PWM frame rate and its lower harmonics avoid an AM tuned frequency, any intermediate frequency in the AM tuner, and also an image frequency in the tuner.
摘要翻译： 一种数字音频系统，包括具有降低的AM干扰的数字音频放大器。 数字音频放大器包括脉冲宽度调制（PWM）处理器，其中数字数据流被内插滤波器上采样。 采样率转换器对上采样的数据流重新采样，以转换采样频率或PWM帧速率产生数据流。 转换的数据流然后被应用于以PWM帧速率产生PWM信号的脉宽调制电路。 采样率转换器根据与AM调谐频率相关的采样率转换比重新采样。 例如，可以选择采样率转换比，使得PWM帧速率及其低次谐波避免AM调谐频率，AM调谐器中的任何中频，以及调谐器中的图像频率。
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3.发明授权Automatic frequency tuning system and method for an FM-band transmit power amplifier 有权FM波段发射功率放大器的自动频率调谐系统和方法公开(公告)号：US08140027B2
公开(公告)日：2012-03-20
申请号：US12253217
申请日：2008-10-16
CPC分类号： H04B1/0458
摘要： An automatic frequency tuning system and method for a transmit power amplifier. The transmit power amplifier has an antenna feed line including a series capacitor and is coupled to an output of an output driver. In one embodiment, the system includes: (1) a shunt capacitor array having a plurality of capacitors selectably couplable to the antenna feed line to apply a programmable shunt capacitance thereto, (2) a peak detector circuit couplable to nodes of the antenna feed line associated with both terminals of the series capacitor and (3) a processor configured to control the peak detector circuit to determine a ratio of voltage levels measured at the nodes at a given power level of the output driver.
摘要翻译： 一种用于发射功率放大器的自动频率调谐系统和方法。 发射功率放大器具有包括串联电容器的天线馈线，并且耦合到输出驱动器的输出端。 在一个实施例中，系统包括：（1）并联电容器阵列，其具有可选择地耦合到天线馈电线的多个电容器，以向其施加可编程分流电容;（2）峰值检测器电路，可耦合到天线馈线的节点 与串联电容器的两个端子相关联;以及（3）配置成控制峰值检测器电路以确定在输出驱动器的给定功率电平处在节点处测量的电压电平的比率的处理器。
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公开(公告)号：US20100172435A1
公开(公告)日：2010-07-08
申请号：US12683012
申请日：2010-01-06
IPC分类号： H04L27/00
CPC分类号： H04L27/14
摘要： An automatic power tuning system and method, and a transmitter employing either the system or the method. In one embodiment, the system includes: (1) a power detector circuit coupled to an output of a transmitter, the transmitter having an integrator with a first, reference integrator current power control input, a second, integrator capacitor power control input and a plurality of driver fingers selectably employable by a third, driver finger power control input, the power detector configured to generate signals indicating an output voltage of the transmitter and (2) a digital processing circuit coupled to the power detector circuit and configured to employ the signals to determine at least near-optimum reference integrator current and integrator capacitor settings and select a number of driver fingers to employ to drive the output voltage.
摘要翻译： 一种自动功率调节系统和方法，以及采用该系统或方法的发射机。 在一个实施例中，该系统包括：（1）功率检测器电路，其耦合到发射器的输出，所述发射器具有积分器，其具有第一参考积分器电流功率控制输入，第二积分器电容器功率控制输入和多个 所述驱动器手指可选择地由第三驱动器手指功率控制输入使用，所述功率检测器被配置为产生指示所述发射器的输出电压的信号;以及（2）数字处理电路，耦合到所述功率检测器电路并且被配置为将所述信号 确定至少接近最佳参考积分器电流和积分电容器设置，并选择一些驱动手指来驱动输出电压。
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公开(公告)号：US08121561B2
公开(公告)日：2012-02-21
申请号：US12683012
申请日：2010-01-06
IPC分类号： H04B1/04
CPC分类号： H04L27/14
摘要： An automatic power tuning system and method, and a transmitter employing either the system or the method. In one embodiment, the system includes: (1) a power detector circuit coupled to an output of a transmitter, the transmitter having an integrator with a first, reference integrator current power control input, a second, integrator capacitor power control input and a plurality of driver fingers selectably employable by a third, driver finger power control input, the power detector configured to generate signals indicating an output voltage of the transmitter and (2) a digital processing circuit coupled to the power detector circuit and configured to employ the signals to determine at least near-optimum reference integrator current and integrator capacitor settings and select a number of driver fingers to employ to drive the output voltage.
摘要翻译： 一种自动功率调节系统和方法，以及采用该系统或方法的发射机。 在一个实施例中，该系统包括：（1）功率检测器电路，其耦合到发射器的输出，所述发射器具有积分器，其具有第一参考积分器电流功率控制输入，第二积分器电容器功率控制输入和多个 所述驱动器手指可选择地由第三驱动器手指功率控制输入使用，所述功率检测器被配置为产生指示所述发射器的输出电压的信号;以及（2）数字处理电路，耦合到所述功率检测器电路并且被配置为将所述信号 确定至少接近最佳参考积分器电流和积分电容器设置，并选择一些驱动手指来驱动输出电压。
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6.发明申请AUTOMATIC FREQUENCY TUNING SYSTEM AND METHOD FOR AN FM-BAND TRANSMIT POWER AMPLIFIER 有权FM波段发射功率放大器的自动调频系统及方法公开(公告)号：US20100099369A1
公开(公告)日：2010-04-22
申请号：US12253217
申请日：2008-10-16
IPC分类号： H04B1/04
CPC分类号： H04B1/0458
摘要： An automatic frequency tuning system and method for a transmit power amplifier. The transmit power amplifier has an antenna feed line including a series capacitor and is coupled to an output of an output driver. In one embodiment, the system includes: (1) a shunt capacitor array having a plurality of capacitors selectably couplable to the antenna feed line to apply a programmable shunt capacitance thereto, (2) a peak detector circuit couplable to nodes of the antenna feed line associated with both terminals of the series capacitor and (3) a processor configured to control the peak detector circuit to determine a ratio of voltage levels measured at the nodes at a given power level of the output driver.
摘要翻译： 一种用于发射功率放大器的自动频率调谐系统和方法。 发射功率放大器具有包括串联电容器的天线馈线，并且耦合到输出驱动器的输出端。 在一个实施例中，系统包括：（1）并联电容器阵列，其具有可选择地耦合到天线馈电线的多个电容器，以向其施加可编程分流电容;（2）峰值检测器电路，可耦合到天线馈线的节点 与串联电容器的两个端子相关联;以及（3）配置成控制峰值检测器电路以确定在输出驱动器的给定功率电平处在节点处测量的电压电平的比率的处理器。
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