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11. 发明申请

WO2015059471A1 CLASS-D AMPLIFIER CIRCUITS 审中-公开
标题翻译： CLASS-D放大器电路
公开(公告)号：WO2015059471A1
公开(公告)日：2015-04-30
申请号：PCT/GB2014/053150
申请日：2014-10-22
申请人： WOLFSON MICROELECTRONICS LTD
发明人： LESSO, John Paul , IDO, Toru
IPC分类号： H03F3/217
CPC分类号： H03F3/2171 , H03F1/0211 , H03F3/187 , H03F3/217 , H03F2200/165 , H03F2200/171 , H03F2200/333 , H03F2200/351 , H03G1/0088
摘要： This application describes methods and apparatus for Class-D amplifier circuits (300) with improved power efficiency. The circuit has an output stage (102) with at least first and second switches and a modulator (104) that receives an input signal to be amplified, S IN , and a first clock signal f SW . The modulator controls the duty cycles of the first and second switches, within a switching cycle based on the input signal, wherein the switching cycle has a switching frequency based on the first clock signal. A frequency controller (301) controls the frequency of the first clock signal in response to an indication of the amplitude of the input signal so as to provide a first switching frequency at a first input signal amplitude and a second, lower, switching frequency at a second, lower, input signal amplitude. A lower switching frequency can be tolerated at low signal amplitudes and varying the switching frequency in this way thus maintains stability whilst reducing switching power losses.
摘要翻译：本申请描述了具有改善的功率效率的D类放大器电路（300）的方法和装置。电路具有至少具有第一和第二开关的输出级（102）和接收待放大的输入信号SIN和第一时钟信号fSW的调制器（104）。调制器基于输入信号在开关周期内控制第一和第二开关的占空比，其中开关周期具有基于第一时钟信号的开关频率。频率控制器（301）响应于输入信号的幅度的指示来控制第一时钟信号的频率，以便在第一输入信号幅度和第二输入信号的第二开关频率第二，较低的输入信号幅度。在低信号幅度下可以容忍较低的开关频率，并且以这种方式改变开关频率，从而在降低开关功率损耗的同时保持稳定性。

12. 发明申请

WO2012055968A1 AUDIO AMPLIFIER USING MULTI-LEVEL PULSE WIDTH MODULATION 审中-公开
标题翻译：使用多级脉冲宽度调制的音频放大器
公开(公告)号：WO2012055968A1
公开(公告)日：2012-05-03
申请号：PCT/EP2011/068873
申请日：2011-10-27
申请人： MERUS APS , HØYERBY, Mikkel
发明人： HØYERBY, Mikkel
IPC分类号： H03F3/217
CPC分类号： H03F1/0244 , H02M7/487 , H03F3/00 , H03F3/187 , H03F3/2173 , H03F3/2178 , H03F2200/03 , H03F2200/267 , H03F2200/333 , H04R3/02
摘要： The present invention relates in one aspect to a class D audio amplifier with improved output driver topology supporting multi-level output signals such as 3- level, 4-level or 5-level pulse width or pulse density modulated output signals for application to a loudspeaker load. The present class D audio amplifiers are particularly well-suited for high-volume consumer audio applications and solutions.
摘要翻译：本发明在一个方面涉及具有改进的输出驱动器拓扑的D类音频放大器，其支持诸如3级，4级或5级脉冲宽度的多电平输出信号或用于应用于扬声器的脉冲密度调制输出信号加载。目前的D类音频放大器特别适用于大容量消费音频应用和解决方案。

13. 发明申请

WO2008144364A1 DUAL MODE POWER AMPLIFIER 审中-公开
标题翻译：双模功率放大器
公开(公告)号：WO2008144364A1
公开(公告)日：2008-11-27
申请号：PCT/US2008/063652
申请日：2008-05-15
申请人： ATHEROS COMMUNICATIONS, INC. , LEE, Meelan , SI, William W. , WEBER, David J.
发明人： LEE, Meelan , SI, William W. , WEBER, David J.
IPC分类号： H03G5/16
CPC分类号： H04L27/20 , H03F1/02 , H03F1/0277 , H03F3/217 , H03F3/24 , H03F3/245 , H03F3/45179 , H03F3/72 , H03F2200/324 , H03F2200/333 , H03F2200/432 , H03F2203/45394 , H04B1/406 , H04B2001/045
摘要： A dual mode power amplifier can include a linear gain section and a non-linear gain section configured together as a polar amplifier. The dual mode power amplifier may be used to transmit GFSK, 4-DPSK, and 8-DPSK modulated data. In one mode, both non-linear and linear gain sections may be used to transmit 4-DPSK and 8-DPSK modulated data. Alternatively, in another mode, the linear gain section may be bypassed while the non-linear gain section may be used to transmit GFSK modulated data. By selecting the operating mode, the dual mode power amplifier may be advantageously configured to use relatively less power while supporting GFSK, 4-DPSK, and 8-DPSK modulation schemes.
摘要翻译：双模功率放大器可以包括线性增益部分和一起配置为极性放大器的非线性增益部分。双模功率放大器可用于发送GFSK，4-DPSK和8-DPSK调制数据。在一种模式中，非线性和线性增益部分都可用于发送4-DPSK和8-DPSK调制数据。或者，在另一种模式中，线性增益部分可以被旁路，而非线性增益部分可以用于发送GFSK调制数据。通过选择操作模式，双模式功率放大器可有利地配置为在支持GFSK，4-DPSK和8-DPSK调制方案的同时使用相对较少的功率。

14. 发明申请

WO2008140730A1 LINEAR RF AMPLIFIER WITH POLAR FEEDBACK 审中-公开
标题翻译：具有极性反馈的线性RF放大器
公开(公告)号：WO2008140730A1
公开(公告)日：2008-11-20
申请号：PCT/US2008/005886
申请日：2008-05-08
申请人： M/A-COM, INC. , LANE, John, R. , OVERSTREET, William, P.
发明人： LANE, John, R. , OVERSTREET, William, P.
IPC分类号： H03F3/189 , H03F1/32 , H03F3/24 , H03F1/06 , H03C5/00 , H04B1/04 , H04L27/36 , H03C3/40
CPC分类号： H03F1/3282 , H03C5/00 , H03F1/0205 , H03F1/3247 , H03F1/3294 , H03F3/189 , H03F3/24 , H03F2200/321 , H03F2200/324 , H03F2200/333 , H03F2200/336 , H03F2200/393 , H03F2200/451 , H03F2200/78 , H04B1/0475 , H04L27/364 , H04L27/368
摘要： A system (100) for power amplification of an RF signal including polar feedback control. The system may include a feedback-controlled modulator (110) configured to modulate an RF signal based on a feedback-corrected control signal. The modulator (110) is further configured to generate a modulated RF signal. The system also may include a phase shifter configured to correct the phase of the modulated RF signal based on a feedback phase control signal. The system further includes a power amplifier (112) in communication with the modulator, and/or the phase shifter. The amplifier (112) is configured to amplify the modulated RF signal and to generate an amplified RF output signal. The system also includes a feedback network (116) configured to generate polar feedback signals, including the feedback-corrected control signal and/or the feedback phase control signal.
摘要翻译：一种用于对包括极性反馈控制的RF信号进行功率放大的系统（100）。该系统可以包括被配置为基于反馈校正的控制信号来调制RF信号的反馈控制调制器（110）。调制器（110）还被配置为产生调制的RF信号。该系统还可以包括移相器，其被配置为基于反馈相位控制信号来校正调制的RF信号的相位。该系统还包括与调制器通信的功率放大器（112）和/或移相器。放大器（112）被配置为放大经调制的RF信号并产生放大的RF输出信号。该系统还包括被配置为产生包括反馈校正的控制信号和/或反馈相位控制信号的极性反馈信号的反馈网络（116）。

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