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1. 发明授权

US06819912B2 Variable frequency switching amplifier and method therefor 有权
标题翻译：变频开关放大器及其方法
公开(公告)号：US06819912B2
公开(公告)日：2004-11-16
申请号：US10008121
申请日：2001-11-05
申请人： William Roeckner , Pallab Midya , Gregory Buchwald
发明人： William Roeckner , Pallab Midya , Gregory Buchwald
IPC分类号： H03F338
CPC分类号： H03F3/2171 , H04B15/04
摘要： A switching amplifier generates noise at its switching frequency and harmonics thereof. The noise at these harmonics, for an audio amplifier, will be generated with significant amplitude in the AM band. Thus, an AM tuner will experience interference problems if the tuner frequency is sufficiently close to one of these harmonics. To avoid this problem the switching frequency of the switching amplifier is chosen based on the tuner frequency. Thus, the switching frequency is chosen to avoid having harmonics at or too near the chosen tuner frequency. The switching amplifier is disabled when the tuner is in seek or scan mode. Instead of using the tuner frequency to determine what switching frequency should be used to avoid interference, the interference can be detected directly to cause a change in the switching frequency and thus remove the interference.
摘要翻译：开关放大器以其开关频率和谐波产生噪声。对于音频放大器，这些谐波的噪声将在AM频带中以显着的幅度产生。因此，如果调谐器频率足够接近这些谐波之一，则AM调谐器将经历干扰问题。为了避免这个问题，基于调谐器频率来选择开关放大器的开关频率。因此，选择开关频率以避免在所选择的调谐器频率处或谐波附近。当调谐器处于寻线或扫描模式时，开关放大器被禁止。不是使用调谐器频率来确定应该使用什么开关频率来避免干扰，所以可以直接检测干扰，导致开关频率的变化，从而消除干扰。

2. 发明授权

US06803816B2 Switching power amplifier 失效
标题翻译：开关功率放大器
公开(公告)号：US06803816B2
公开(公告)日：2004-10-12
申请号：US09955896
申请日：2001-09-19
申请人： Bruno Johan Georges Putzeys
发明人： Bruno Johan Georges Putzeys
IPC分类号： H03F338
CPC分类号： H03F3/217 , H03F3/211 , H03F3/2175 , H03F3/2178 , H03F2200/03 , H03F2200/114 , H03F2200/372 , H03F2200/537
摘要： Switching power amplifiers are used for example in audio applications. Using Class D technology is used to obtain efficient performance. To improve the switching power amplifier further it is proposed to combine a plurality of low-power switching power stages into a larger amplifier. The precision and efficiency of a switching power amplifier is improved without deteriorating the noise and EMI.
摘要翻译：开关功率放大器例如在音频应用中使用。使用D类技术来获得有效的性能。为了进一步改进开关功率放大器，提出将多个低功率开关功率级组合到更大的放大器中。提高了开关功率放大器的精度和效率，而不会降低噪声和EMI。

3. 发明授权

US06794932B1 Class D switching audio amplifier 失效
标题翻译： D类开关音频放大器
公开(公告)号：US06794932B1
公开(公告)日：2004-09-21
申请号：US10377559
申请日：2003-02-27
申请人： Joel Butler
发明人： Joel Butler
IPC分类号： H03F338
CPC分类号： H03F3/38 , H03F3/085 , H03F3/217 , H03F3/2171 , H03F3/2173
摘要： A Class D switching audio amplifier incorporating four state modulation, input-to-output drive and feedback signal isolation, dual topology output filtration, and a low inductance board layout. The four state modulation results in a common mode voltage in the absence of audio. The input-to-output isolation of drive and feedback signals allows for elimination of large power transformers in applications without user-accessible outputs. Such isolation may make use of optical isolators. The output filter includes common mode and differential topology filter stages. The low inductance board layout treats the amplifier and power supply boards as modules, and utilizes both sides of the amplifier board in order to minimize trace length.
摘要翻译： D类开关音频放大器，包含四种状态调制，输入到输出驱动和反馈信号隔离，双拓扑输出滤波和低电感板布局。四状态调制在没有音频的情况下产生共模电压。驱动和反馈信号的输入到输出隔离允许在没有用户可访问输出的应用中消除大功率变压器。这种隔离可能会使用光隔离器。输出滤波器包括共模和差分拓扑滤波级。低电感板布局将放大器和电源板视为模块，并利用放大器板的两侧，以最小化走线长度。

4. 发明授权

US06741123B1 Delta-sigma amplifiers with output stage supply voltage variation compensation and methods and digital amplifier systems using the same 有权
标题翻译：具有输出级电源电压变化补偿和方法的Delta-sigma放大器及使用其的数字放大器系统
公开(公告)号：US06741123B1
公开(公告)日：2004-05-25
申请号：US10329852
申请日：2002-12-26
申请人： Jack Andersen , John Laurence Melanson
发明人： Jack Andersen , John Laurence Melanson
IPC分类号： H03F338
CPC分类号： H03F3/2175 , H03F2200/331
摘要： A delta-sigma modulator for driving an output stage is disclosed. The delta-sigma modulator operates between first and second voltages and includes a loop filter, a quantizer, and a feedback loop coupling an output of the quantizer and an input of the loop filter. The feedback loop includes compensation circuitry for compensating for variations in the first and second voltages in response to a measured average of the first and second voltages and a measured difference between the first and second voltages. Measuring circuitry measures the average and the difference of the first and second voltages.
摘要翻译：公开了用于驱动输出级的Δ-Σ调制器。 Δ-Σ调制器在第一和第二电压之间工作，并且包括环路滤波器，量化器和耦合量化器的输出和环路滤波器的输入的反馈环路。反馈回路包括补偿电路，用于响应于测量的第一和第二电压的平均值和第一和第二电压之间的测量的差值来补偿第一和第二电压的变化。测量电路测量第一和第二电压的平均值和差值。

5. 发明授权

US06734725B2 Power amplifier 有权
标题翻译：功率放大器
公开(公告)号：US06734725B2
公开(公告)日：2004-05-11
申请号：US10299580
申请日：2002-11-19
申请人： Toshihiko Masuda , Kazunobu Ohkuri
发明人： Toshihiko Masuda , Kazunobu Ohkuri
IPC分类号： H03F338
CPC分类号： H03F3/2173 , H03F3/3027 , H03F2200/331
摘要： A power amplifier circuit includes a pair of PWM circuits, to which an input signal is supplied, a pair of push-pull circuits, and drive circuits for supplying the outputs of the PWM circuits to the push-pull circuits as drive signals. A speaker is arranged between the output end of one push-pull circuit and the output end of the other push-pull circuit. The drive circuits alternately drive the respective push-pull circuits every cycle time of a PWM signal. The circuit can suppress radiation caused by the variation in output voltages.
摘要翻译：功率放大器电路包括供给输入信号的一对PWM电路，一对推挽电路和用于将PWM电路的输出作为驱动信号提供给推挽电路的驱动电路。扬声器布置在一个推挽电路的输出端和另一个推挽电路的输出端之间。驱动电路在PWM信号的每周期时间交替地驱动相应的推挽电路。电路可以抑制由输出电压变化引起的辐射。

6. 发明授权

US06720825B2 Method and circuit for reduction of audible turn-on and turn-off transients in switching amplifiers 有权
标题翻译：用于减少开关放大器中可听到的导通和关断瞬变的方法和电路
公开(公告)号：US06720825B2
公开(公告)日：2004-04-13
申请号：US10104853
申请日：2002-03-22
申请人： Thomas H. Hansen , Lars Risbo , Venkateswar R. Kowkutla
发明人： Thomas H. Hansen , Lars Risbo , Venkateswar R. Kowkutla
IPC分类号： H03F338
CPC分类号： H03F3/38 , H03F1/305 , H03F3/217
摘要： A system and method for reducing audible turn-on and turn-off transients in switching amplifiers employs a frequency shaped start sequence in front of a modulated zero-signal or a frequency shaped stop sequence following a modulated zero-signal.
摘要翻译：用于减少开关放大器中的可听到的导通和关断瞬变的系统和方法在调制的零信号之后的调制的零信号或频率形状的停止序列前采用频率形状的起始序列。

7. 发明授权

US06621335B2 Class D amplifier with passive RC network 失效
标题翻译： D类放大器采用无源RC网络
公开(公告)号：US06621335B2
公开(公告)日：2003-09-16
申请号：US10080932
申请日：2002-02-22
申请人： Bengt-Olov Andersson
发明人： Bengt-Olov Andersson
IPC分类号： H03F338
CPC分类号： H03F3/2171
摘要： A Class D amplifier device with reduced power consumption uses a passive RC network. The output of the RC network directly feeds a comparator resulting in increased efficiency. The RC network is configured to perform several functions, including the low pass filtering of the feedback signal to remove high frequency/high amplitude clock components and provides a DC path from its output to reduce duty cycle errors. Additionally, the input signal receives low pass filtering, creating a generally flat frequency response. Finally, the clock signal is filtered to generate a triangle wave of good linearity and appropriate amplitude.
摘要翻译：具有降低功耗的D类放大器器件使用无源RC网络。 RC网络的输出直接馈送比较器，从而提高效率。 RC网络被配置为执行几个功能，包括反馈信号的低通滤波以去除高频/高幅度时钟组件，并从其输出提供DC路径以减少占空比误差。另外，输入信号接收低通滤波，产生大致平坦的频率响应。最后，对时钟信号进行滤波以产生良好线性度和适当振幅的三角波。

8. 发明授权

US06605991B2 Circuitry for creating a spectral null in a differential output switching amplifier and method therefor 有权
标题翻译：用于在差分输出开关放大器中产生频谱零点的电路及其方法
公开(公告)号：US06605991B2
公开(公告)日：2003-08-12
申请号：US09943177
申请日：2001-08-30
申请人： Pallab Midya , William Roeckner
发明人： Pallab Midya , William Roeckner
IPC分类号： H03F338
CPC分类号： H03F3/2173 , H03F3/2171 , H03F2200/342 , H03F2200/345 , H03F2200/351
摘要： A modulated signal is connected to a full bridge switching amplifier (16, 18, 28, 30) and is compensated to remove a predetermined frequency and its odd harmonics. The compensation inverts and delays (26) a signal that is connected to a first half of the full bridge and applies the delayed inverted signal to a second half of the full bridge. By delaying by an odd number of half cycles, the carrier and its odd harmonics are cancelled because the same signal exists on both sides of the full bridge output. When these two same signals are subtracted by the full bridge action, the carrier and odd harmonics are suppressed. Spectral nulls may be provided for various signal applications, not just audio, and when various types of modulation techniques are used, such as PWM and PDM.
摘要翻译：调制信号连接到全桥开关放大器（16,18,28,30），并被补偿以去除预定频率及其奇次谐波。补偿反相并延迟（26）连接到全桥的前半部分的信号，并将延迟的反相信号施加到全桥的后半部分。通过延迟奇数半周期，载波及其奇次谐波被消除，因为在全桥输出的两侧存在相同的信号。当通过全桥动作减去这两个相同的信号时，载波和奇次谐波被抑制。可以为各种信号应用（不仅仅是音频）以及当使用各种类型的调制技术（例如PWM和PDM）时提供频谱零点。

9. 发明授权

US06593807B2 Digital amplifier with improved performance 失效
标题翻译：数字放大器性能提升
公开(公告)号：US06593807B2
公开(公告)日：2003-07-15
申请号：US10028954
申请日：2001-12-10
申请人： William Harris Groves, Jr. , Arthur Alan Aaron
发明人： William Harris Groves, Jr. , Arthur Alan Aaron
IPC分类号： H03F338
CPC分类号： H03F3/2173
摘要： A class D amplifier uses a summation of two or more PWM output stages to achieve an increased dynamic range and improved linearity for any given clock operating speed. The amplifier accepts a digital data stream as its input, such as from a compact disk, or other compatible media, at a data rate, Fa, that could be 44.1 kHz, 96 kHz, or any other rate appropriate for audio data. In the preferred embodiment, the input audio data resolution, N bits, would be split into two data samples, of J and K. Internal switching frequency, Fs, switches the PWM with an over sampling factor M, where Fs=M*Fa. The time resolution of the PWM is determined by a precision oscillator that operates at Fc=Fs*(max(J,K)−log2(M)+1). The J most significant bits would be routed to a power PWM stage operated at a DC voltage of VHI. The K least significant bits are routed to a finesse PWM stage operated at a DC voltage of VLO. The ratio of VLO to VHI will be appropriate for the ratio of K and J so the summation of the power PWM stage and the finesse PWM stage will provide the full range of N bits. This summation is accomplished with a low pass filter and time-division multiplexing of the two PWM stages. A micro controller (MCU) is used to apply a sample packet distribution algorithm to provide more resolution by reducing quantization noise in the audio band of interest. The MCU is also used to calibrate the VLO or VHI, or to calibrate the PWM timing of the two PWM stages to achieve appropriate performance.
摘要翻译： D类放大器使用两个或多个PWM输出级的求和来实现任何给定时钟运行速度下的增加的动态范围和改善的线性度。放大器以数据速率Fa可以接收数字数据流作为其输入，例如来自光盘或其他兼容介质，可以是44.1kHz，96kHz或适用于音频数据的任何其他速率。在优选实施例中，输入音频数据分辨率N比特将被分成J和K的两个数据样本。内部切换频率Fs以过采样因子M切换PWM，其中Fs = M * Fa。 PWM的时间分辨率由在Fc = Fs *（max（J，K）-log2（M）+1）处工作的精密振荡器确定.J个最高有效位将被路由到在 VHI的直流电压。 K个最低有效位被路由到在VLO的直流电压下操作的精细PWM级，VLO与VHI的比率将适合于K和J的比率，使得功率PWM级和精细PWM级的总和将提供N位的全范围。这个求和是通过低通滤波器和两个PWM级的时分复用完成的。微控制器（MCU）用于应用采样分组分布算法，以通过减少感兴趣的音频带中的量化噪声来提供更多的分辨率。 MCU还用于校准VLO或VHI，或校准两个PWM级的PWM定时以实现适当的性能。

10. 发明授权

US06593806B1 Circuits and methods for compensating switched mode amplifiers 有权
标题翻译：用于补偿开关模式放大器的电路和方法
公开(公告)号：US06593806B1
公开(公告)日：2003-07-15
申请号：US09927808
申请日：2001-08-10
申请人： John Laurence Melanson
发明人： John Laurence Melanson
IPC分类号： H03F338
CPC分类号： H03F3/217 , H03F1/3241 , H03F3/2178 , H03F2200/294 , H03F2200/331 , H03F2200/372
摘要： A system and method for compensating switched mode amplifiers. The amplifier system includes an adaptive filter coupled to the output of circuitry that recovers the analog signal from the output of the switching amplifier circuitry. The adaptive filter derives an inverse transfer function of the forward path through the system. The derived inverse transfer function is used to generate a coefficient map which a compensation filter responsively compensates for from variations in the output load of the amplifier system. In the disclosed method, the deriving the inverse transfer function may further include calibrating the adaptive filter continuously, at system startup or in response to user demand.
摘要翻译：一种用于补偿开关模式放大器的系统和方法。放大器系统包括耦合到电路输出的自适应滤波器，其从开关放大器电路的输出恢复模拟信号。自适应滤波器导出通过系统的前向路径的反向传递函数。导出的反向传递函数用于生成补偿滤波器响应于从放大器系统的输出负载的变化补偿的系数图。在所公开的方法中，导出逆传递函数还可以包括在系统启动时或响应于用户需求连续校准自适应滤波器。

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