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1. 发明授权

US10079574B2 Wideband adaptive bias circuits for power amplifiers 有权
公开(公告)号：US10079574B2
公开(公告)日：2018-09-18
申请号：US15019409
申请日：2016-02-09
申请人： MediaTek Inc.
发明人： Hsing-ting Yu , Fei Song , I-Chang Wu , YuenHui Chee , Chiyuan Lu , Keng Leong Fong , Osama K. A. Shana'a
IPC分类号： H03F3/45 , H03F1/02 , H03F3/193 , H03F3/21
CPC分类号： H03F1/0222 , H03F1/0261 , H03F1/0266 , H03F1/0277 , H03F1/0288 , H03F1/48 , H03F3/193 , H03F3/211 , H03F3/245 , H03F3/45 , H03F3/45071 , H03F3/45179 , H03F3/45183 , H03F3/72 , H03F2200/18 , H03F2200/36 , H03F2200/435 , H03F2200/451 , H03F2200/453 , H03F2200/465 , H03F2200/555 , H03F2203/21106 , H03F2203/45311 , H03F2203/45352 , H03F2203/45368 , H03F2203/45544 , H03F2203/45674 , H03F2203/7206
摘要： Methods and apparatus for providing adaptive biasing to power amplifiers. Adaptive bias circuits are configured to provide sharp turn on and/or current clamping to improve the efficiency of a power amplifier over a wide input signal bandwidth. Sharp turn on may be achieved using a subtraction technique to subtract outputs from multiple detectors. Clamping may be achieved using MOSFET device characteristics to pull the device from the triode region into the saturation, subtraction techniques to subtract the outputs from multiple detectors, and/or by using circuit devices, such as diodes.

2. 发明授权

US09722544B2 Audio system having an improved efficiency and extended operation time 有权
公开(公告)号：US09722544B2
公开(公告)日：2017-08-01
申请号：US15367228
申请日：2016-12-02
申请人： Logitech Europe S.A
发明人： Alan Olson , Sean Chiu , Jianhua Pan , Constantine Mouzakis , Jeffrey Anderson , Patrick Nicolet
IPC分类号： H03F99/00 , H03F1/02 , H03F3/185 , H03F3/217 , H04R29/00 , H04R3/00
CPC分类号： H03F1/0227 , H03F3/185 , H03F3/2171 , H03F3/68 , H03F2200/03 , H03F2200/102 , H03F2200/435 , H04R3/007 , H04R29/001
摘要： Embodiments of the disclosure may include a method and apparatus for improving the efficiency and extending the operation time between recharges or replacement batteries of a portable audio delivery system. The audio delivery system may include a processor, an audio processing device, a speaker, and a rechargeable power source. The audio delivery system is generally configured to generate and/or receive an audio input signal and efficiently deliver an amplified, high quality audio output signal to a user. In some embodiments of the disclosure, the audio processing device of the audio delivery system may include a switch mode power supply (SMPS), a signal delay element, an envelope detector, and a switching signal amplifier.

3. 发明申请

US20170194912A1 AUDIO SYSTEM HAVING AN IMPROVED EFFICIENCY AND EXTENDED OPERATION TIME 审中-公开
公开(公告)号：US20170194912A1
公开(公告)日：2017-07-06
申请号：US15465586
申请日：2017-03-21
申请人： Logitech Europe S.A
发明人： Alan OLSON , Sean CHIU , Jianhua PAN , Constantine MOUZAKIS , Jeffrey ANDERSON , Patrick NICOLET
IPC分类号： H03F1/02 , H03F3/185 , H03F3/217 , H04R3/00
CPC分类号： H03F1/0227 , H03F3/185 , H03F3/2171 , H03F3/68 , H03F2200/03 , H03F2200/102 , H03F2200/435 , H04R3/007 , H04R29/001
摘要： Embodiments of the disclosure may include a method and apparatus for improving the efficiency and extending the operation time between recharges or replacement batteries of a portable audio delivery system. The audio delivery system may include a processor, an audio processing device, a speaker, and a rechargeable power source. The audio delivery system is generally configured to generate and/or receive an audio input signal and efficiently deliver an amplified, high quality audio output signal to a user. In some embodiments of the disclosure, the audio processing device of the audio delivery system may include a switch mode power supply (SMPS), a signal delay element, an envelope detector, and a switching signal amplifier.

4. 发明授权

US09667207B2 Amplifier control apparatus 有权
公开(公告)号：US09667207B2
公开(公告)日：2017-05-30
申请号：US14528867
申请日：2014-10-30
申请人： KSC Industries Incorporated
发明人： Steven C. Moles
IPC分类号： H03F3/38 , H03F3/217 , H03F1/02
CPC分类号： H03F3/217 , H03F1/0227 , H03F2200/102 , H03F2200/351 , H03F2200/435
摘要： An apparatus for controlling a pulse width modulation (PWM) amplifier is disclosed. In one aspect, the apparatus includes a delay circuit configured to delay an input signal and provide the delayed input signal to the PWM amplifier. The apparatus also includes a controller configured to generate and provide a supply voltage to the PWM amplifier based at least in part on the input signal such that the PWM amplifier generates an output signal based at least partially on the delayed input signal and the supply voltage.

5. 发明申请

US20160118970A1 PEAK DETECTOR USING CHARGE PUMP AND BURST-MODE TRANSIMPEDANCE AMPLIFIER 有权
标题翻译：峰值检测器使用充电泵和脉冲模式转换放大器
公开(公告)号：US20160118970A1
公开(公告)日：2016-04-28
申请号：US14924955
申请日：2015-10-28
申请人： ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
发明人： Young Ho KIM , Eui Suk JUNG
IPC分类号： H03K5/1532 , H03F3/45 , G01R19/04 , H03G3/30
CPC分类号： H03K5/1532 , G01R19/04 , H03F3/45183 , H03F3/45475 , H03F3/45968 , H03F2200/435 , H03F2200/453 , H03F2203/45138 , H03F2203/45212 , H03G3/30 , H03G3/3084
摘要： A peak detector using a charge pump is provided. The peak detector includes a differential amplifier configured to receive an input signal to be detected through an input node and amplify the received signal; a current control logic configured to create two or more current control signals by comparing a signal output from the differential amplifier with two or more reference voltages; a mirror current source portion comprising two or more mirror current sources configured to be driven respectively by the current control signals from the current control logic; a capacitor configured to be charged or discharged by currents output from the mirror current sources; and a reset circuit configured to reset a voltage of the capacitor.
摘要翻译：提供使用电荷泵的峰值检测器。峰值检测器包括：差分放大器，被配置为通过输入节点接收要检测的输入信号并放大接收信号; 电流控制逻辑，被配置为通过将从差分放大器输出的信号与两个或更多个参考电压进行比较来产生两个或更多个电流控制信号; 镜电流源部分，包括被配置为分别由来自当前控制逻辑的电流控制信号驱动的两个或更多个镜电流源; 配置为通过从所述反射镜电流源输出的电流进行充电或放电的电容器; 以及复位电路，其被配置为复位所述电容器的电压。

6. 发明授权

US09225290B2 Radio frequency signal amplifying system 有权
标题翻译：射频信号放大系统
公开(公告)号：US09225290B2
公开(公告)日：2015-12-29
申请号：US14090629
申请日：2013-11-26
申请人： MICROELECTRONICS TECHNOLOGY, INC.
发明人： Ming Che Liou
IPC分类号： H03F1/02 , H03F1/56 , H03F3/193 , H03F3/24 , H03F3/26
CPC分类号： H03F1/0222 , H03F1/0233 , H03F1/0266 , H03F1/0272 , H03F1/56 , H03F3/193 , H03F3/245 , H03F3/265 , H03F2200/207 , H03F2200/435 , H03F2200/451 , H03F2200/534 , H03F2200/541
摘要： A radio frequency signal amplifying system includes an amplifier having an input terminal and an output terminal, an attenuator electrically connected to the input terminal of the amplifier, a peak power detecting module configured to apply a peak power attenuation signal to the attenuator by taking a peak power level of an input signal into consideration, and an average power detecting module configured to apply an average power attenuation signal to the attenuator by taking an average power level of an output signal from the output terminal into consideration. The attenuator is configured to generate the attenuated signal to the input terminal of the amplifier by taking the peak power attenuation signal, the average power attenuation signal, or the combination thereof into consideration.
摘要翻译：射频信号放大系统包括具有输入端和输出端的放大器，电连接到放大器的输入端的衰减器，峰值功率检测模块，被配置为通过采用峰值对衰减器施加峰值功率衰减信号考虑输入信号的功率电平，以及平均功率检测模块，被配置为通过考虑来自输出端子的输出信号的平均功率电平来向衰减器施加平均功率衰减信号。衰减器被配置为通过考虑峰值功率衰减信号，平均功率衰减信号或其组合来产生衰减信号到放大器的输入端。

7. 发明申请

US20140285261A1 CONTROLLED POWER BOOST FOR ENVELOPE TRACKER 有权
标题翻译：用于包装跟踪器的控制电源
公开(公告)号：US20140285261A1
公开(公告)日：2014-09-25
申请号：US13919465
申请日：2013-06-17
申请人： Broadcom Corporation
发明人： Sriraman Dakshinamurthy , Robert Gustav Lorenz
IPC分类号： H03F1/02 , H03F3/20 , H03F3/189
CPC分类号： H03F3/20 , H03F1/025 , H03F1/3241 , H03F3/195 , H03F3/245 , H03F2200/336 , H03F2200/435
摘要： An envelope-tracking (ET) power supply may include a boost control pin. The boost control pin receives a boost enable signal that activates or enables a supplemental power supply in the ET power supply. The supplemental power supply facilitates the generation of a power supply signal for a selected processing stage, e.g., a power amplifier. The supplemental power supply helps the processing stage meet the demands on it caused by the signal that the processing stage needs to handle.
摘要翻译：信封跟踪（ET）电源可以包括升压控制引脚。升压控制引脚接收升压启动信号，激活或启用ET电源中的补充电源。辅助电源有助于为所选择的处理级（例如功率放大器）产生电源信号。补充电源有助于处理阶段满足处理阶段需要处理的信号对其的要求。

8. 发明申请

US20140146919A1 HIGH EFFICIENCY ADAPTIVE RF TRANSMITTER 有权
标题翻译：高效自适应射频发射器
公开(公告)号：US20140146919A1
公开(公告)日：2014-05-29
申请号：US14085599
申请日：2013-11-20
申请人： Aviacomm Inc.
发明人： Tao Li , Hans Wang , Binglei Zhang , Shih Hsiung Mo
IPC分类号： H04L27/26
CPC分类号： H04L27/2614 , H03F1/0266 , H03F1/32 , H03F3/24 , H03F2200/435 , H03F2201/3203 , H04L27/2627
摘要： One embodiment of the present invention provides a system for controlling operations of an amplifier in a wireless transmitter. During operation, the system receives a baseband signal to be transmitted, and dynamically switches an operation mode of the amplifier between a high power back-off mode having a first power back-off factor and a normal mode having a second power back-off factor based on a level of the baseband signal.
摘要翻译：本发明的一个实施例提供一种用于控制无线发射机中放大器的操作的系统。在操作期间，系统接收要发送的基带信号，并且在具有第一功率回退系数的高功率退避模式和具有第二功率回退系数的正常模式之间动态地切换放大器的操作模式基于基带信号的电平。

9. 发明授权

US08594590B2 Method for controlling peak-to-average power ratio of single carrier FDMA system 有权
标题翻译：用于控制单载波FDMA系统的峰均功率比的方法
公开(公告)号：US08594590B2
公开(公告)日：2013-11-26
申请号：US12982989
申请日：2010-12-31
申请人： Young-Seo Park , Yadunandana N. Rao , Darrell J. Stogner
发明人： Young-Seo Park , Yadunandana N. Rao , Darrell J. Stogner
IPC分类号： H04B1/04
CPC分类号： H03F1/02 , H03F3/24 , H03F2200/435 , H03F2200/66 , H04L27/2623 , H04L27/2636
摘要： A method for controlling peak-to-average power ratio prior to amplification by a power amplifier is provided. The peak sample of a signal is predicted, window length is adjusted based on the peak width around the peak sample or subcarriers used to transmit the signal, and the window is subsequently used to clip the samples. A peak suppression window may be applied prior to predicting the peak sample when a set number of samples exceed a predetermined threshold. Window clipping may be deactivated if interference and throughput of the power amplifier is detrimentally affected. A pulse shaping filter may be optimized based on the window clipping to control transmitted signal characteristics. Various thresholds used in the prediction may be initially based on system design and power amplifier linearity and then dynamically adjusted based on an estimation of active subcarriers or of interferers present in the communication system.
摘要翻译：提供了一种用于在功率放大器放大之前控制峰值与平均功率比的方法。预测信号的峰值采样，基于用于发送信号的峰值采样或子载波周围的峰值宽度来调整窗口长度，并且窗口随后用于剪辑采样。当设定数量的样本超过预定阈值时，可以在预测峰值采样之前应用峰值抑制窗口。如果功率放大器的干扰和吞吐量受到不利影响，则可以禁用窗口削波。可以基于窗口限幅来优化脉冲整形滤波器以控制发射信号特性。预测中使用的各种阈值可以最初基于系统设计和功率放大器线性度，然后基于在通信系统中存在的活动子载波或干扰源的估计来动态调整。

10. 发明申请

US20130049735A1 RADIO FREQUENCY POWER AMPLIFIER PROTECTION SYSTEM 有权
标题翻译：无线电频率放大器保护系统
公开(公告)号：US20130049735A1
公开(公告)日：2013-02-28
申请号：US13216876
申请日：2011-08-24
申请人： Thomas Ogle Shafer , Tony Monroe Bragg , Gary Altman
发明人： Thomas Ogle Shafer , Tony Monroe Bragg , Gary Altman
IPC分类号： G01R19/00
CPC分类号： H03F1/523 , H03F3/245 , H03F2200/435 , H03G3/3042
摘要： A radio frequency (RF) power amplifier protection system for a radio. The protection system utilizes a resistive tap connected to the drain of a power amplifier transistor and a high speed voltage detector. The protection system uses short, low-power tests pulses to determine the quality of an antenna load upon tuning the radio to an RF carrier frequency by transmitting the short test pulse. If the measured voltage value exceeds a calibrated value, the power of the RF transmitter is reduced for subsequent operation or the RF transmitter is shut down completely. The invention also includes a system and method for detecting when an antenna is disconnected from a radio using an low frequency AC signal to measure the resistance of an antenna connected to an RF transmitter.
摘要翻译：射频（RF）功率放大器保护系统。保护系统利用连接到功率放大器晶体管和高速电压检测器的漏极的电阻抽头。保护系统使用短的低功率测试脉冲来通过发送短测试脉冲将无线电调谐到RF载波频率来确定天线负载的质量。如果测量的电压值超过校准值，则RF发射器的功率会降低，以便后续操作或RF发射器完全关闭。本发明还包括一种用于检测天线何时使用低频AC信号与无线电断开连接以测量连接到RF发射机的天线的电阻的系统和方法。

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