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61. 发明授权

US06489841B2 Class D audio amplifier 有权
公开(公告)号：US06489841B2
公开(公告)日：2002-12-03
申请号：US10104764
申请日：2002-03-20
申请人： Hideto Takagishi
发明人： Hideto Takagishi
IPC分类号： H03F338
CPC分类号： H03F3/2171 , H03F2200/331
摘要： A Class D amplifier circuit performs audio signal processing and other signal processing by using a bang-bang controller and a noise-shaping feedback network. The bang-bang controller triggers generation of a rectangular waveform that corresponds to changes in a control signal derived from an input analog signal, with the generation of the rectangular waveform being based on a comparison of the control signal with another signal derived from hysteresis associated with an output of a comparator. A filter filters the rectangular waveform to obtain an amplified output analog signal substantially representative of the input analog signal. The feedback network noise shapes the output analog signal, and feeds back the noise-shaped output analog signal and substracts it from the input analog signal.

62. 发明授权

US06469575B2 Circuit for amplifying and outputting audio signals 失效
标题翻译：用于放大和输出音频信号的电路
公开(公告)号：US06469575B2
公开(公告)日：2002-10-22
申请号：US09810505
申请日：2001-03-19
申请人： Masashi Oki , Kazuhiro Okamoto
发明人： Masashi Oki , Kazuhiro Okamoto
IPC分类号： H03F338
CPC分类号： H03F3/2173 , H03F1/523 , H03F3/2171 , H03F3/343 , H03F2200/331 , H03F2200/351 , H03K7/08 , H03K17/0822
摘要： A circuit for amplifying and outputting a pulse width modulated (PWM) signal corresponding to an input audio signal with at least one output transistor and at least one protection control circuit. The protection control circuit compares a detected voltage and a threshold voltage. The detection voltage is a potential difference between a source and a drain of the output transistor. When the detection voltage exceeds the threshold voltage, the protection control circuit outputs a short circuit detection signal to the gate of the output transistor. As a result, the output transistor is turned OFF.
摘要翻译：一种用于利用至少一个输出晶体管和至少一个保护控制电路放大并输出对应于输入音频信号的脉宽调制（PWM）信号的电路。保护控制电路比较检测电压和阈值电压。检测电压是输出晶体管的源极和漏极之间的电位差。当检测电压超过阈值电压时，保护控制电路向输出晶体管的栅极输出短路检测信号。结果，输出晶体管截止。

63. 发明授权

US06429737B1 Method and apparatus for multi-channel digital amplification 有权
标题翻译：用于多通道数字放大的方法和装置
公开(公告)号：US06429737B1
公开(公告)日：2002-08-06
申请号：US09611231
申请日：2000-07-06
申请人： Thomas Joseph O'Brien
发明人： Thomas Joseph O'Brien
IPC分类号： H03F338
CPC分类号： H03F3/68 , H03F3/2178 , H03F2200/351 , H03K7/08
摘要： The invention provides a method and apparatus for the modulation of more than one channel of audio in a digital amplification system. In the preferred embodiment of the invention, pulse width modulator outputs are staggered in time such that at idle only one channel switches states at a time. This is done to provide an even draw from the power supply, assuming that the same supply is used for the multiple channels. For example, in a two channel system, the idle state of the pulse width modulator for the first channel is 90 degrees out of phase with the pulse width modulator output of the second channel.
摘要翻译：本发明提供一种用于在数字放大系统中调制多于一声道的音频的方法和装置。在本发明的优选实施例中，脉冲宽度调制器输出在时间上交错，使得在空闲时，一个通道一次切换状态。这样做是为了从电源提供均匀的电压，假设相同的电源用于多个通道。例如，在双通道系统中，第一通道的脉宽调制器的空闲状态与第二通道的脉宽调制器输出相差90度。

64. 发明授权

US06414544B2 Demodulation filter 有权
标题翻译：解调滤波器
公开(公告)号：US06414544B2
公开(公告)日：2002-07-02
申请号：US09864145
申请日：2001-05-24
申请人： Marco Berkhout
发明人： Marco Berkhout
IPC分类号： H03F338
CPC分类号： H03F3/217 , H03F3/2171 , H03F3/2173
摘要： The invention describes an improvement of a demodulation filter for use in a push-pull amplifier. Known demodulation filters have the disadvantage that in the common mode they have a peaking and oscillating loop introducing great distortions. The demodulation filter according to the invention overcomes these disadvantages by introducing a common mode damping without influencing the differential mode.
摘要翻译：本发明描述了用于推挽放大器的解调滤波器的改进。已知的解调滤波器的缺点在于，在共模中，它们具有引起很大失真的峰值和振荡环路。根据本发明的解调滤波器克服了这些缺点通过引入共模阻尼而不影响差分模式。

65. 发明授权

US06404280B1 Method and system for low-distortion power amplification 失效
标题翻译：低失真功率放大的方法和系统
公开(公告)号：US06404280B1
公开(公告)日：2002-06-11
申请号：US09870693
申请日：2001-06-01
申请人： Ming-Fure Jeng
发明人： Ming-Fure Jeng
IPC分类号： H03F338
CPC分类号： H03F3/217
摘要： In a method and system for low-distortion power amplification, an error signal is generated by comparing a feedback signal obtained from an amplified output signal of a power switching stage with one of an input pulse-width modulated (PWM) signal from a PWM signal generator and a corrected PWM signal at an input terminal of the power switching stage. Each pulse of the input PWM signal is then corrected to result in the corrected PWM signal that is provided to the power switching stage. Each pulse of the input PWM signal is corrected by adjusting the phase thereof such that each pulse of the input PWM signal has a center that forms a predetermined time difference with a center of a corresponding pulse of the corrected PWM signal, and by adjusting the width thereof according to the error signal.
摘要翻译：在用于低失真功率放大的方法和系统中，通过将从功率开关级的放大输出信号获得的反馈信号与来自PWM信号的输入脉宽调制（PWM）信号之一进行比较来产生误差信号发电机和在功率切换级的输入端的校正的PWM信号。然后校正输入PWM信号的每个脉冲，以产生提供给功率切换级的校正PWM信号。通过调整输入PWM信号的相位来校正输入PWM信号的每个脉冲，使得输入PWM信号的每个脉冲具有与校正的PWM信号的相应脉冲的中心形成预定时间差的中心，并且通过调整宽度根据误差信号。

66. 发明授权

US06392476B1 System and method of producing direct audio from a power supply 有权
标题翻译：从电源产生直接音频的系统和方法
公开(公告)号：US06392476B1
公开(公告)日：2002-05-21
申请号：US09524304
申请日：2000-03-14
申请人： Manuel D. Rodriguez
发明人： Manuel D. Rodriguez
IPC分类号： H03F338
CPC分类号： H03F3/38 , H03F3/2171 , H03F2200/03 , H03F2200/351 , H03F2200/541
摘要： A novel circuit that generates direct audio from a power supply that uses no power amplifier and that can provide full isolation to any impedance load. It has no power amplifier output stage and has a zero signal-to-noise ratio when there is no signal input because the circuit is designed with MOSFETS that do not conduct unless there is a signal input. The circuit includes an input rectifier for rectifying an input audio signal, a pulse width modulator for producing a signal modulated by the rectified audio signal, a power amplification stage for amplifying the pulse width modulated signal, a positive/negative rectifier pair for positively and negatively rectifying the amplified pulse width modulated signal, a demodulator for demodulating the positively and negatively rectified signal in order to generate a power amplified audio signal, and a switching network for directing the positively rectified signal to the demodulator in response to the signal polarity detector sensing a first polarity of the input audio signal, and for directing the negatively rectified signal to the demodulator in response to the signal polarity detector sensing a second polarity of the input audio signal. A low power embodiment uses a single power supply to bias push-pull transistors, a medium power embodiment uses positive and negative rails individually to bias the push-pull transistors, and a high power embodiment uses the additive sum of the positive and negative rails to bias the push-pull transistors.
摘要翻译：一种新颖的电路，可以从不使用功率放大器的电源产生直接音频，并可以为任何阻抗负载提供完全隔离。当没有信号输入时，它没有功率放大器输出级，并且具有零信噪比，因为电路设计为不导通的MOSFET，除非有信号输入。该电路包括用于整流输入音频信号的输入整流器，用于产生由整流音频信号调制的信号的脉冲宽度调制器，用于放大脉宽调制信号的功率放大级，用于正和负的正/负整流器对整流放大的脉宽调制信号，解调器，用于解调正和负整流信号，以便产生功率放大音频信号;以及切换网络，用于响应于信号极性检测器感测到正向整流信号而将正整流信号引导到解调器输入音频信号的第一极性，并且用于响应于信号极性检测器感测输入音频信号的第二极性而将负整流信号引导到解调器。低功率实施例使用单个电源来偏置推挽晶体管，中等功率实施例单独使用正极和负极来偏置推挽晶体管，并且高功率实施例使用正和负导轨的相加和偏置推挽晶体管。

67. 发明授权

US06380802B1 Transmitter using input modulation for envelope restoration scheme for linear high-efficiency power amplification 失效
标题翻译：发射机使用输入调制进行线性高效功率放大的包络恢复方案
公开(公告)号：US06380802B1
公开(公告)日：2002-04-30
申请号：US09752417
申请日：2000-12-29
申请人： David R. Pehike , William O. Camp, Jr. , Antonio J. Montalvo
发明人： David R. Pehike , William O. Camp, Jr. , Antonio J. Montalvo
IPC分类号： H03F338
CPC分类号： H03F1/3247 , H03C5/00 , H03F1/02 , H03F3/2176 , H03F3/24 , H03F3/393 , H04B2001/0408 , H04B2001/045
摘要： An apparatus and method for creating an amplifier input waveform based on received phase and amplitude information from an input signal. The apparatus includes a first switch receiving phase information from a primary waveform and a second switch in communication with the first switch and the input. The second switch receives amplitude information from the primary waveform and receives the phase information from the first switch and uses the amplitude information to modulate the phase information. A secondary waveform is thus created for input to the amplifier load matching network. In this way, an amplitude modulated waveform is amplified at high efficiency, enabling application of either all or part of the phase and/or amplitude modulation at the input of the amplifier.
摘要翻译：一种用于基于从输入信号接收的相位和幅度信息产生放大器输入波形的装置和方法。该装置包括：第一开关，接收来自初级波形的相位信息;以及第二开关，与第一开关和输入端通信。第二开关从主波形接收振幅信息，并从第一开关接收相位信息，并使用振幅信息来调制相位信息。因此，创建用于输入到放大器负载匹配网络的次级波形。以这种方式，幅度调制波形以高效率被放大，使得能够在放大器的输入处施加全部或部分相位和/或幅度调制。

68. 发明授权

US06339360B1 Digital amplifier with pulse insertion circuit 失效
标题翻译：带脉冲插入电路的数字放大器
公开(公告)号：US06339360B1
公开(公告)日：2002-01-15
申请号：US09567327
申请日：2000-05-09
申请人： Lee Carlos Santillano
发明人： Lee Carlos Santillano
IPC分类号： H03F338
CPC分类号： H03F3/2171
摘要： A digital amplifier having an input for receiving an input signal employs an oscillator for producing a reference pulse signal and a sawtooth signal. A first generating circuit coupled to the oscillator is responsive to the reference pulse signal for producing a first pulse signal of a first polarity. A second generating circuit coupled to the first generating circuit is responsive to said first pulse signal for producing a second pulse signal of a polarity opposite the first polarity. A comparator responsively coupled to the input and said oscillator compares the input signal and the sawtooth signal and produces a comparator output signal operable between first and second states, for toggling the comparator output signal between the first and second states each time the input signal equals the sawtooth signal. The comparator output is maintained in the first or second state when the input signal exceeds the sawtooth signal. A pulse insertion circuit responsively coupled to the comparator and the first and second generating circuits produces an insertion signal during intervals when the comparator output is maintained in either of the first or second states.
摘要翻译：具有用于接收输入信号的输入的数字放大器采用用于产生参考脉冲信号和锯齿波信号的振荡器。耦合到振荡器的第一产生电路响应于参考脉冲信号以产生第一极性的第一脉冲信号。耦合到第一产生电路的第二产生电路响应所述第一脉冲信号产生与第一极性相反的极性的第二脉冲信号。响应于耦合到输入和振荡器的比较器比较输入信号和锯齿波信号，并产生可在第一和第二状态之间工作的比较器输出信号，用于每当输入信号等于第一和第二状态时，在第一和第二状态之间切换比较器输出信号锯齿信号。当输入信号超过锯齿波信号时，比较器输出保持在第一或第二状态。响应性地耦合到比较器和第一和第二发生电路的脉冲插入电路在比较器输出保持在第一状态或第二状态中的间隔期间产生插入信号。

69. 发明授权

US06300826B1 Apparatus and method for efficiently amplifying wideband envelope signals 有权
标题翻译：用于有效放大宽带包络信号的装置和方法
公开(公告)号：US06300826B1
公开(公告)日：2001-10-09
申请号：US09566194
申请日：2000-05-05
申请人： Lennart Mathe , Don Kimball , Joe Archambault , Walter Haley
发明人： Lennart Mathe , Don Kimball , Joe Archambault , Walter Haley
IPC分类号： H03F338
CPC分类号： H03F3/2171 , H03F1/0222 , H03F3/2173 , H03F2200/504
摘要： Systems and methods for amplifying an RF input signal include employing a moderately power efficient wide bandwidth device, such as an AB-type amplifier, to amplify the power residing in the high frequency components of the input signal, and a highly power efficient narrow bandwidth device, such as a synchronous buck DC/DC converter, to amplify the power residing in the low frequency components of the input signal. The amplified low frequency components and high frequency components are then combined to produce an amplified replica of the RF input signal. A positive feedback loop is provided between the output of the AB-type amplifier and the input of the DC/DC converter to provide stability to the amplified RF signal. A negative feedback loop is provided between the output of the DC/DC converter and the input of the AB-type amplifier to minimize interference introduced by the DC/DC converter.
摘要翻译：用于放大RF输入信号的系统和方法包括采用诸如AB型放大器的适度功率有效的宽带宽设备来放大驻留在输入信号的高频分量中的功率和高功率有效的窄带宽设备，例如同步降压DC / DC转换器，以放大驻留在输入信号的低频分量中的功率。然后将放大的低频分量和高频分量组合以产生RF输入信号的放大副本。在AB型放大器的输出端与DC / DC转换器的输入端之间提供正反馈回路，以提供放大的RF信号的稳定性。在DC / DC转换器的输出端和AB型放大器的输入端之间提供一个负反馈回路，以最小化由DC / DC转换器引入的干扰。

70. 发明授权

US06288605B1 Power switching output stage with dead zone minimization and possibility of parallel synchronous connection 有权
标题翻译：具有死区最小化的电源开关输出级和并联同步连接的可能性
公开(公告)号：US06288605B1
公开(公告)日：2001-09-11
申请号：US09484756
申请日：2000-01-18
申请人： Edoardo Botti , Danilo Ranieri
发明人： Edoardo Botti , Danilo Ranieri
IPC分类号： H03F338
CPC分类号： H03F3/68 , H03F3/211 , H03F3/2178
摘要： A switching output power stage, including a power switching device for the supply line and a complementary power switching device for the ground rail driven in phase opposition by a pulse width modulated (PWM) drive signal, is provided with sensors detecting a substantial turn-off state of each of the two power switching devices and generating a pair of logic signals. A combinatory logic circuit combines the drive signal and the pair of logic signals and generates a pair of driving signals of opposite phase for the respective power switching devices. The switching to a turn-on state of any of the two power devices is enabled upon verifying a substantially attained turn-off state by the device complementary to the device commanded to turn-on, irrespective of the process spread and of changes of temperature load conditions and of configuration of a plurality of output stages of a multichannel amplifier.
摘要翻译：开关输出功率级包括用于电源线的电源开关装置和用于通过脉冲宽度调制（PWM）驱动信号相位相对驱动的地面导轨的互补功率开关装置，其具有检测基本关断的传感器状态，并产生一对逻辑信号。组合逻辑电路组合了驱动信号和逻辑信号对，并且为相应的功率开关器件产生相反相位的一对驱动信号。两个功率器件中的任何一个的开启状态的切换可以通过与被指令接通的器件互补的器件来验证实质上达到的关断状态，而与工艺扩展和温度负载变化无关条件和多通道放大器的多个输出级的配置。

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