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公开(公告)号：US06606044B2
公开(公告)日：2003-08-12
申请号：US10034909
申请日：2002-01-02
IPC分类号： H03M300
CPC分类号： H03F3/2175 , H03F2200/331 , H03M1/822 , H03M5/08
摘要： A method and apparatus for a pulse width modulated (PWM) signal (30, 130) is provided. The input is a digital signal which is a modulated signal (24, 124). In the illustrated form, the modulated input signal is either a PDM signal or a PCM signal. In one embodiment of the present invention a PCM to PWM converter (16, 116) includes correction of duty ratio circuitry (48). The methodology used may include recursion on the values obtained after prediction, interpolation, and correction. The digital to analog conversion system (10) uses a PDM to PWM converter (20) which operates in an all digital domain and includes no analog circuitry.
摘要翻译： 提供了一种用于脉宽调制（PWM）信号（30,130）的方法和装置。 输入是作为调制信号（24,124）的数字信号。 在所示的形式中，调制输入信号是PDM信号或PCM信号。 在本发明的一个实施例中，PCM至PWM转换器（16,116）包括占空比电路（48）的校正。 所使用的方法可以包括在预测，插值和校正之后获得的值的递归。 数模转换系统（10）使用PDM到PWM转换器（20），其在全数字域中工作，并且不包括模拟电路。
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公开(公告)号：US06504427B2
公开(公告)日：2003-01-07
申请号：US09872283
申请日：2001-05-31
IPC分类号： H03F338
CPC分类号： H03F3/2175
摘要： A switching amplifier (15) includes a power stage (18) and a digital correction circuit (16). The digital correction circuit (16) is for correcting nonlinearity and power supply noise introduced into a digital signal during power stage amplification. The digital correction circuit (16) receives a digital pulse modulated input signal from a processor (14) and an amplified pulse modulated output signal from the power stage (18), and performs a discrete-time pulse edge correction on the digital pulse modulated input signal to provide a corrected digital pulse modulated signal. The corrected digital pulse modulated signal is used as an input for the power stage (18).
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3.发明申请DIGITAL PULSE WIDTH MODULATED FEEDBACK SYSTEM FOR A SWITCHING AMPLIFIER AND METHOD THEREFOR 失效用于切换放大器的数字脉冲宽度调制反馈系统及其方法公开(公告)号：US20090102549A1
公开(公告)日：2009-04-23
申请号：US11875998
申请日：2007-10-22
申请人： Pallab Midya , Theresa Paulo , William J. Roeckner
发明人： Pallab Midya , Theresa Paulo , William J. Roeckner
IPC分类号： H03F3/38
CPC分类号： H03F3/217
摘要： A switching amplifier includes a power stage, a low pass filter, a combining circuit, and a feedback correction circuit. The power stage has an input terminal and an output terminal. The low pass filter has an input terminal coupled to the output terminal of the power stage, and an output terminal for providing a filtered pulse width modulated signal. The combining circuit has a first input terminal coupled to the output terminal of the power stage, a second input terminal coupled to the output terminal of the low pass filter, and an output terminal. The feedback correction circuit has a first input terminal for receiving a reference pulse width modulated signal, a second input terminal coupled to the output terminal of the combining circuit, and an output terminal coupled to the input terminal of the power stage.
摘要翻译： 开关放大器包括功率级，低通滤波器，组合电路和反馈校正电路。 功率级具有输入端子和输出端子。 低通滤波器具有耦合到功率级的输出端的输入端和用于提供经滤波的脉宽调制信号的输出端。 组合电路具有耦合到功率级的输出端的第一输入端，耦合到低通滤波器的输出端的第二输入端和输出端。 反馈校正电路具有用于接收参考脉冲宽度调制信号的第一输入端子，耦合到组合电路的输出端子的第二输入端子和耦合到功率级输入端子的输出端子。
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公开(公告)号：US07312654B2
公开(公告)日：2007-12-25
申请号：US11314203
申请日：2005-12-20
申请人： William J. Roeckner , Pallab Midya , Patrick L. Rakers , Lawrence E. Connell , Daniel A. Mavencamp , Bradley C. Stewart
发明人： William J. Roeckner , Pallab Midya , Patrick L. Rakers , Lawrence E. Connell , Daniel A. Mavencamp , Bradley C. Stewart
IPC分类号： H03F3/38
CPC分类号： H03F3/2173 , H03F1/305 , H03F3/2171 , H03F3/72 , H03F2200/03 , H03F2200/351 , H03K17/161
摘要： A closed loop audio amplifier system and method of powering up/down the system without producing audible artifacts are provided. During power up, a prebias voltage is provided to each output connected to a speaker to increase the voltage to a nominal output level. High impedance switches are then driven at a 50% duty cycle. Feedback from the output is supplied to a servo, which is enabled to fine tune the output voltage. Low impedance switches are then driven at a 50% duty cycle at a quarter cycle timing. The order of the feedback loop depends on which of the high or low impedance switches are driven. The prebias voltage is then removed before audio signals to be amplified are supplied to the system. Timing of driving of the switches is programmable. To power down, essentially the reverse sequence is provided.
摘要翻译： 提供一种闭环音频放大器系统以及在不产生可听见的伪影的情况下对系统加电/下电的方法。 在上电期间，向连接到扬声器的每个输出端提供预偏置电压以将电压增加到额定输出电平。 然后以50％占空比驱动高阻抗开关。 输出端的反馈信号被提供给一个伺服控制器，可以对输出电压进行微调。 然后，在四分之一周期的时间，以50％的占空比驱动低阻抗开关。 反馈环路的顺序取决于驱动高阻抗或低阻抗开关中的哪一个。 然后在将要放大的音频信号提供给系统之前，去除预偏置电压。 开关的驱动时序是可编程的。 为了断电，基本上提供了相反的顺序。
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公开(公告)号：US20100109767A1
公开(公告)日：2010-05-06
申请号：US12262127
申请日：2008-10-30
CPC分类号： H03F3/217
摘要： A switching amplifier drives a load or audio transducer. A digital integral noise shaping circuit converts a digital input such as audio content to an output digital pulse width modulated signal using an integrator. The integrator integrates the digital input, a variable frequency reference pulse width modulated signal and an inverse of the output digital pulse width modulated signal. A half bridge amplifier receives the output digital pulse width modulated signal and drives the load or audio transducer. A variable frequency generator generates the variable frequency reference pulse width modulated signal with an approximately equal duty ratio or alternatively varies the variable frequency pulse width modulated signal above and below about a fifty percent duty ratio.
摘要翻译： 开关放大器驱动负载或音频传感器。 数字积分噪声整形电路使用积分器将诸如音频内容的数字输入转换为输出数字脉宽调制信号。 积分器将数字输入，可变频率参考脉冲宽度调制信号和输出数字脉宽调制信号的反相相结合。 半桥放大器接收输出数字脉宽调制信号并驱动负载或音频传感器。 可变频率发生器以大致相等的占空比产生可变频率参考脉冲宽度调制信号，或者可选地改变高于和低于约百分之五十占空比的可变频率脉宽调制信号。
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6.发明授权Full bridge integral noise shaping for quantization of pulse width modulation signals 有权全桥积分噪声整形，用于量化脉宽调制信号公开(公告)号：US07142597B2
公开(公告)日：2006-11-28
申请号：US10255213
申请日：2002-09-26
申请人： Pallab Midya , William J. Roeckner
发明人： Pallab Midya , William J. Roeckner
IPC分类号： H03K7/08
CPC分类号： H03M1/0682 , H03F3/2173 , H03F2200/351 , H03M1/504
摘要： Systems and methods are described for full bridge integral noise shaping for quantization of pulse width modulated signals. A method for full bridge integral noise shaping comprises: receiving a first and a second reference PWM signal; summing the first and second reference PWM signals with a quantization error correction; quantizing the sum into a first and a second output PWM signal; differentially integrating the first and second reference PWM signals and the first and second output PWM signals according to a full bridge integral noise shaping algorithm to obtain the quantization error correction. An apparatus for performing a full bridge integral noise shaping quantization of a pulse modulated signal, includes: a single-ended to differential conversion circuit; and a full bridge INS quantizer circuit, coupled to the single-ended to differential conversion circuit.
摘要翻译： 描述了用于量化脉冲宽度调制信号的全桥积分噪声整形的系统和方法。 一种用于全桥积分噪声整形的方法，包括：接收第一和第二参考PWM信号; 用量化误差校正求和第一和第二参考PWM信号; 将所述和量化为第一和第二输出PWM信号; 根据全桥积分噪声整形算法对第一和第二参考PWM信号以及第一和第二输出PWM信号进行差分积分以获得量化误差校正。 一种用于执行脉冲调制信号的全桥积分噪声整形量化的装置，包括：单端到差分转换电路; 和全桥INS量化器电路，耦合到单端到差分转换电路。
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公开(公告)号：US20110012674A1
公开(公告)日：2011-01-20
申请号：US12503816
申请日：2009-07-15
申请人： Pallab Midya , William J. Roeckner
发明人： Pallab Midya , William J. Roeckner
IPC分类号： H03F3/38
摘要： A switching audio amplifier circuit drives a switching audio amplifier stage using a digital PWM signal from an audio source. A PWM duty ratio modifier modifies an edge timing of the digital PWM signal to produce a modified digital PWM signal. A mode switch switches between the digital PWM signal and the modified digital PWM signal in a way that masks audible noise such as clicks and pops at power-up and power-down of the switching audio amplifier. An integrating error amplifier compares a difference between the digital PWM signal and an amplified PWM signal and integrates the difference to control the edge timing modified by the PWM duty ratio modifier. A mode controller can apply an offset signal to the integrating error amplifier and can control the switching of the mode switch.
摘要翻译： 开关音频放大器电路使用来自音频源的数字PWM信号驱动开关音频放大器级。 PWM占空比修改器修改数字PWM信号的边沿定时，以产生修改的数字PWM信号。 模式开关在数字PWM信号和修改的数字PWM信号之间切换，以掩盖在开关音频放大器的上电和掉电时的可听到的噪声，例如咔嗒声和咔嗒声。 积分误差放大器将数字PWM信号和放大的PWM信号之间的差异进行比较，并将差值积分，以控制由PWM占空比修正器修改的边沿时序。 模式控制器可以将偏移信号应用于积分误差放大器，并可以控制模式开关的切换。
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公开(公告)号：US20090261902A1
公开(公告)日：2009-10-22
申请号：US12104874
申请日：2008-04-17
IPC分类号： H03F3/217
CPC分类号： H03F3/217
摘要： A circuit (104, 106) includes a comparison circuit (202, 504, 506, 602) and a correction circuit (204, 508, 510, 604). The comparison circuit provides a comparison signal (212, 524, 526, 612) in response to an error value (210, 520, 522, 610) and a reference value (214). The error value is based on a pulse modulated input signal (114) and a pulse modulated output signal (118). The correction circuit asynchronously provides a corrected pulse modulated signal (116) by selectively delaying and advancing an edge of the pulse modulated input signal based on the comparison signal. The pulse modulated output signal is based on the corrected pulse modulated signal.
摘要翻译： 电路（104,106）包括比较电路（202,504,506,602）和校正电路（204,508,510,604）。 比较电路响应于错误值（210,520,522,610）和参考值（214）提供比较信号（212,524,526,612）。 误差值基于脉冲调制输入信号（114）和脉冲调制输出信号（118）。 校正电路通过基于比较信号选择性地延迟和前进脉冲调制输入信号的边沿来异步地提供校正的脉冲调制信号（116）。 脉冲调制输出信号基于经校正的脉冲调制信号。
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9.发明申请公开(公告)号：US20110012575A1
公开(公告)日：2011-01-20
申请号：US12503807
申请日：2009-07-15
IPC分类号： G05F1/10
摘要： A switching power converter converts an input DC voltage to an output DC voltage using a switch to selectively connect an input DC voltage energy source. A switching controller controls the switch. A pulse width modulation centering signal is generated by a spread spectrum clock signal generator. An error amplifier of the switching controller generates an analog error signal based on a switching voltage measured after the switching of the switching power converter, the output voltage of the switching power converter, the pulse width modulation centering signal and a reference. A pulse width modulated signal generator generates the pulse width modulation signal to control the switch of the switching power converter based on the pulse width modulation centering signal and the analog error signal.
摘要翻译： 开关电源转换器使用开关将输入DC电压转换为输出DC电压，以选择性地连接输入DC电压能量源。 开关控制器控制开关。 脉宽调制定心信号由扩频时钟信号发生器产生。 开关控制器的误差放大器基于开关电源转换器切换后的开关电压，开关功率转换器的输出电压，脉冲宽度调制对中信号和基准值，生成模拟误差信号。 脉冲宽度调制信号发生器产生脉冲宽度调制信号，以根据脉宽调制定心信号和模拟误差信号来控制开关功率转换器的开关。
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公开(公告)号：US07777563B2
公开(公告)日：2010-08-17
申请号：US12338279
申请日：2008-12-18
申请人： Pallab Midya , William J. Roeckner
发明人： Pallab Midya , William J. Roeckner
IPC分类号： H03F3/38
CPC分类号： H03F3/217
摘要： A circuit includes a variable frequency generator circuit and a quantization circuit. The variable frequency generator circuit provides a discontinuous switching frequency signal. The variable frequency generator circuit varies the discontinuous switching frequency signal between a first and second frequency while avoiding at least one frequency band between the first and second frequency. The quantization circuit provides a plurality discrete switching signals each separated by a second frequency band that vary in accordance with the discontinuous switching frequency signal, wherein the avoided frequency band of the discontinuous switching frequency signal is greater than the second frequency band.
摘要翻译： 电路包括可变频率发生器电路和量化电路。 可变频率发生器电路提供不连续的开关频率信号。 可变频率发生器电路在第一和第二频率之间改变不连续的开关频率信号，同时避免第一和第二频率之间的至少一个频带。 量化电路提供多个离散切换信号，每个离散切换信号由根据不连续切换频率信号而变化的第二频带分开，其中不连续切换频率信号的避免频带大于第二频带。
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