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公开(公告)号：US07440731B2
公开(公告)日：2008-10-21
申请号：US11191687
申请日：2005-07-27
申请人： Joseph Staudinger , Benjamin R. Gilsdorf , David A. Newman , George B. Norris , Gary W. Sadowniczak , Richard E. Sherman
发明人： Joseph Staudinger , Benjamin R. Gilsdorf , David A. Newman , George B. Norris , Gary W. Sadowniczak , Richard E. Sherman
CPC分类号： H04B1/0458 , H03F1/0205 , H03F1/0261 , H03F1/32 , H03F3/24 , H03F2200/105 , H03G3/3047 , H04B2001/0416
摘要： A radio frequency (“RF”) power amplifier circuit as described herein is configured to detect and measure an output load mismatch and to adjust the operating characteristics of the RF power amplifier to reduce output signal distortion. The circuit includes a directional RF signal coupler that obtains a coupled reflected RF signal that is indicative of the output load mismatch. The coupled reflected RF signal is processed to generate one or more bias control signals for the RF power amplifier. In operation, a mismatch condition will result in a measurable coupled reflected RF signal and a corresponding reduction in output power from the RF power amplifier. Ultimately, the output power control mechanism strives to maintain the RF power amplifier within a linear operating range.
摘要翻译： 如本文所述的射频（“RF”）功率放大器电路被配置为检测和测量输出负载失配并且调整RF功率放大器的工作特性以减小输出信号失真。 该电路包括定向RF信号耦合器，其获得指示输出负载不匹配的耦合的反射RF信号。 处理耦合的反射RF信号以产生用于RF功率放大器的一个或多个偏置控制信号。 在操作中，不匹配条件将导致可测量的耦合反射RF信号和来自RF功率放大器的输出功率的相应降低。 最终，输出功率控制机制致力于将RF功率放大器维持在线性工作范围内。
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公开(公告)号：US07301402B2
公开(公告)日：2007-11-27
申请号：US11282734
申请日：2005-11-17
IPC分类号： H03F1/52
CPC分类号： H03F3/24 , H03F1/0205 , H03F1/32 , H03F3/189 , H03F2200/78
摘要： A soft saturation detection circuit for a radio frequency (“RF”) power amplifier is configured to detect the onset of soft saturation in an unambiguous and accurate manner. The circuit compares the time derivative of a voltage signal indicative of the RF output power to the time derivative of a control voltage signal for the RF power amplifier. The circuit also employs a gating mechanism that ensures that a soft saturation indication signal is generated under appropriate operating conditions.
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公开(公告)号：US06617920B2
公开(公告)日：2003-09-09
申请号：US10123271
申请日：2002-04-16
IPC分类号： H03F338
CPC分类号： H03F1/0233 , H03F1/34
摘要： A linear envelope tracking radio frequency (RF) power amplifier having an adaptive analog signal processing circuit. The amplifier outputs a voltage which is sampled by the adaptive analog signal processing circuit. The adaptive analog signal processing circuit generates an error signal which varies the linearity of the power amplifier. In one embodiment, the error signal controls a modulator which in turn controls the supply voltage to the power amplifier. In another embodiment, the control signal varies a controller which in turn varies a load placed on the power amplifier. The load in turn varies in linearity of the amplifier.
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公开(公告)号：US06407634B1
公开(公告)日：2002-06-18
申请号：US09595073
申请日：2000-06-16
IPC分类号： H03F338
CPC分类号： H03F1/0233 , H03F1/34
摘要： A linear envelope tracking radio frequency (RF) power amplifier having an adaptive analog signal processing circuit. The amplifier outputs a voltage which is sampled by the adaptive analog signal processing circuit. The adaptive analog signal processing circuit generates an error signal which varies the linearity of the power amplifier. In one embodiment, the error signal controls a modulator which in turn controls the supply voltage to the power amplifier. In another embodiment, the control signal varies a controller which in turn varies a load placed on the power amplifier. The load in turn varies in linearity of the amplifier.
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公开(公告)号：US07276974B2
公开(公告)日：2007-10-02
申请号：US11222545
申请日：2005-09-08
IPC分类号： H02H7/20
摘要： Method and apparatus are provided for protecting radio frequency (RF) power amplifiers. A circuit (10) is provided for limiting a supply current to a first stage (Q3) of the RF power amplifier having a second stage (Q2) coupled to the first stage. The circuit comprises a comparator (14) having first and second inputs and an output, and a switching circuit (12, 20, 22, 24) having an input coupled to the output of the comparator (14) and having an output configured to couple to the first stage (Q3). The first input of the comparator (14) is configured to receive the supply current, and the second input is configured to receive a current supplied to the second stage (Q2). The comparator (14) is configured to compare a ratio of the supply current to the first stage to the current supplied to the second stage (Q2) with a predetermined value. The switching circuit (12, 20, 22, 24) is configured to limit the supply current to the first stage (Q3) when the ratio exceeds the predetermined value.
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公开(公告)号：US07262667B2
公开(公告)日：2007-08-28
申请号：US10970098
申请日：2004-10-20
IPC分类号： H03F1/52
CPC分类号： H03F1/30 , H03F1/0211 , H03F3/24 , H03F3/72 , H03F2200/78 , H04B2001/0408
摘要： A radio frequency (RF) power amplification circuit including a power amplifier is provided for preventing breakdown of the power amplifier. The power amplifier includes an input for receiving RF signals and an output for providing amplified RF signals. The RF power amplification circuit also includes a bias circuit coupled to the input of the power amplifier to permit normal operation of the power amplifier when the base current is below a predetermined current threshold and to prevent normal operation of the power amplifier when the base current is above the predetermined current threshold.
摘要翻译： 提供了包括功率放大器的射频（RF）功率放大电路，用于防止功率放大器的击穿。 功率放大器包括用于接收RF信号的输入和用于提供放大的RF信号的输出。 RF功率放大电路还包括耦合到功率放大器的输入端的偏置电路，以便当基极电流低于预定电流阈值时允许功率放大器的正常操作，并且当基极电流为基极电流时，防止功率放大器的正常工作 高于预定电流阈值。
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公开(公告)号：US06809593B1
公开(公告)日：2004-10-26
申请号：US10424251
申请日：2003-04-28
IPC分类号： H03G310
CPC分类号： H03F1/302 , H03F3/211 , H03F2200/504
摘要： A power amplifier's base current is biased by a control circuit that produces a linear relationship across varying temperatures and processes. A voltage to current converter controls a voltage follower configured operational amplifier in response to a reference device to drive the voltage and current of the power amplifier. A slope control circuit is coupled to the reference device to limit a maximum power control slope.
摘要翻译： 功率放大器的基极电流由控制电路偏置，该控制电路在不同的温度和过程之间产生线性关系。 电压到电流转换器响应于参考装置控制电压跟随器配置的运算放大器来驱动功率放大器的电压和电流。 斜坡控制电路耦合到参考装置以限制最大功率控制斜率。
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公开(公告)号：US06750722B2
公开(公告)日：2004-06-15
申请号：US10184857
申请日：2002-06-28
IPC分类号： H03F304
CPC分类号： H03F1/302
摘要： A power amplifier's base current is biased by a control circuit that produces a linear relationship across varying temperatures and processes. A voltage to current converter controls a voltage follower configured operational amplifier in response to a reference device to drive the voltage and current of the power amplifier.
摘要翻译： 功率放大器的基极电流由控制电路偏置，该控制电路在不同的温度和过程之间产生线性关系。 电压到电流转换器响应于参考装置控制电压跟随器配置的运算放大器来驱动功率放大器的电压和电流。
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公开(公告)号：US06600344B1
公开(公告)日：2003-07-29
申请号：US09605084
申请日：2000-06-26
IPC分类号： H03K5153
CPC分类号： H03K5/1532
摘要： An envelope detector circuit for use in controlling a RF amplifier is provided. The envelope detector circuit includes a first semiconductor device having a first input port that receives a first input signal and a first output port that provides current to charge a capacitor in response to the first input signal. The envelope detector circuit additionally includes a first current drain coupled to the first semiconductor device and the capacitor, where the first current drain conducts current away from the capacitor. The envelope detector circuit further includes a second semiconductor device having a second input port that is set to a biasing voltage and a second output port that is coupled to the first output port of the first semiconductor device. A voltage level of the first output port is indicative of a level of an envelope of the first input signal when the voltage level remains above a threshold voltage equaling the biasing voltage minus a semiconductor voltage, and the voltage level otherwise does not fall below the threshold voltage.
摘要翻译： 提供一种用于控制RF放大器的包络检测器电路。 包络检测器电路包括第一半导体器件，其具有接收第一输入信号的第一输入端口和响应于第一输入信号而提供电流来对电容器充电的第一输出端口。 包络检测器电路还包括耦合到第一半导体器件和电容器的第一电流漏极，其中第一电流漏极使电流远离电容器。 包络检测器电路还包括具有设置为偏置电压的第二输入端口和耦合到第一半导体器件的第一输出端口的第二输出端口的第二半导体器件。 当电压电平保持高于等于偏置电压减去半导体电压的阈值电压时，第一输出端口的电压电平表示第一输入信号的包络电平，而电压电平不会低于阈值 电压。
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