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1. 发明申请

US20050116849A1 Feedback steering delta-sigma modulators and systems using the same 有权
公开(公告)号：US20050116849A1
公开(公告)日：2005-06-02
申请号：US10379742
申请日：2003-03-05
申请人： John Melanson , Xiaofan Fei , Johann Gaboriau
发明人： John Melanson , Xiaofan Fei , Johann Gaboriau
IPC分类号： H03M20060101 , H03M3/00 , H03M7/32 , H03M7/34 , H03M7/36 , H03M7/38 , H03M1/56
CPC分类号： H03M7/3006 , H03M7/3011 , H03M7/3026 , H03M7/3033 , H03M7/3037
摘要： A digital to analog converter including an input for receiving an input signal, a ramp generator, and a delta-sigma modulator responsive to the input signal and an output of the ramp generator. An order of a noise shaping transfer function of the delta-sigma modulator is response to a level of the output of the ramp generator.

2. 发明授权

US06972705B1 Signal processing system having an ADC delta-sigma modulator with single-ended input and feedback signal inputs 有权
标题翻译：信号处理系统具有具有单端输入和反馈信号输入的ADCΔ-Σ调制器
公开(公告)号：US06972705B1
公开(公告)日：2005-12-06
申请号：US11011732
申请日：2004-12-14
申请人： Xiaofan Fei , Johann Gaboriau , John L. Melanson
发明人： Xiaofan Fei , Johann Gaboriau , John L. Melanson
IPC分类号： H03M3/00 , H03M3/04
CPC分类号： H03M3/39 , H03M3/424 , H03M3/452
摘要： Signal processing systems described herein include an analog-to-digital delta sigma modulator to process a single-ended input signal using a single-ended analog feedback reference signal. The delta sigma modulator includes a switched capacitor circuit that integrates a difference between the single-ended input signal and the single-ended analog feedback signal derived from a quantization output of the delta sigma modulator. Embodiments of the switched capacitor circuit allow the delta sigma modulator to be implemented with fewer switches, less complicated reference signal generators, and smaller capacitors relative to conventional counterparts. Thus, embodiments of the delta sigma modulator described herein can cost less to build and use less power. Embodiments of the signal processing systems can be implemented in single and multi-bit delta sigma modulators and various sampling topologies, including single and double sampling topologies.
摘要翻译：本文描述的信号处理系统包括使用单端模拟反馈参考信号来处理单端输入信号的模数转换ΔΣ调制器。 ΔΣ调制器包括开关电容器电路，其对单端输入信号和从Δ-Σ调制器的量化输出得到的单端模拟反馈信号之间的差进行积分。开关电容器电路的实施例允许使用更少的开关，较不复杂的参考信号发生器和相对于常规对应物的较小电容器来实现Δ-Σ调制器。因此，本文描述的Δ-Σ调制器的实施例可以降低构建和使用较少功率的成本。信号处理系统的实施例可以在单位和多位ΔΣ调制器和各种采样拓扑中实现，包括单采样和双采样拓扑。

3. 发明授权

US08841894B1 Pulse-width modulated (PWM) audio power amplifier with output transition slope control 有权
标题翻译：脉宽调制（PWM）音频功率放大器，具有输出过渡斜率控制
公开(公告)号：US08841894B1
公开(公告)日：2014-09-23
申请号：US13327934
申请日：2011-12-16
申请人： Shahrzad Naraghi , Johann Gaboriau , John L. Melanson
发明人： Shahrzad Naraghi , Johann Gaboriau , John L. Melanson
IPC分类号： H02M3/155
CPC分类号： H03F3/217 , H02M1/38 , H02M3/1588 , H02M2001/0029 , H03F1/26 , H03F3/181 , Y02B70/1466
摘要： An audio switching power amplifier having an output with controlled-slope transitions maintains efficiency while avoiding uncontrolled non-overlap intervals during switching transitions. A pair of transistors forming a half-bridge that supplies an output signal at an output terminal of the amplifier are operated so that neither transistor is fully on during an overlap time period. A current source provides an output current to the output terminal during the non-overlap time period to control the output voltage while changing the transistor that conducts the output current from a first one of the pair of transistors to a second one of the pair of transistors. The current source may be provided by operation of one of the transistors in a current source configuration. The voltage of a gate of one of the transistors can be compared with a threshold to provide an indication of the current.
摘要翻译：具有受控斜率转换的输出的音频开关功率放大器保持效率，同时在切换转换期间避免不受控制的非重叠间隔。形成在放大器的输出端提供输出信号的半桥的一对晶体管被操作，使得在重叠时间段期间两个晶体管都不会完全导通。电流源在非重叠时间周期期间向输出端提供输出电流，以在改变将输出电流从该对晶体管中的第一晶体管导通到该对晶体管中的第二晶体管的晶体管时控制输出电压。可以通过当前源配置中的晶体管之一的操作来提供电流源。可以将晶体管中的一个的栅极的电压与阈值进行比较以提供电流的指示。

4. 发明授权

US07554409B1 Over-current protection circuit and method for protecting switching power amplifier circuits 有权
标题翻译：过流保护电路和保护开关功率放大器电路的方法
公开(公告)号：US07554409B1
公开(公告)日：2009-06-30
申请号：US11862481
申请日：2007-09-27
申请人： Lingli Zhang , Johann Gaboriau
发明人： Lingli Zhang , Johann Gaboriau
IPC分类号： H03F1/52
CPC分类号： H03F1/523 , H03F3/187 , H03F3/2173
摘要： An over-current protection circuit protection circuit and method for protecting switching power amplifier circuits provides protection against latch-up and other failures due to energy returned from an inductive load when one or more transistors in the amplifier output are disabled in response to an over-current condition. Upon detection of an over-current condition, the transistor corresponding to the over-current conduction direction is disabled. At the same time, the transistor corresponding to the conduction direction opposite the over-current direction is enabled for a predetermined time period, or until the magnitude of the load current has dropped, so that energy stored in inductance of the load is reduced, preventing back-currents that would otherwise cause latch-up and consequent destruction of the output stage when the switching power output stage is disabled. After the predetermined time period has elapsed or the load current has dropped below a threshold, the entire output stage is disabled.
摘要翻译：用于保护开关功率放大器电路的过电流保护电路保护电路和方法提供了防止由于放大器输出中的一个或多个晶体管响应于过载保护而被禁用时由电感负载返回的能量的闩锁和其它故障，当前的状况。在检测到过电流状态时，与过电流导通方向相对应的晶体管被禁用。同时，对应于与过电流方向相反的导通方向的晶体管能够预定的时间段，或者直到负载电流的大小下降，从而减少存储在负载电感中的能量，从而防止当开关功率输出级被禁用时，否则会导致闭锁和随后的输出级的破坏的反向电流。在经过预定时间段或者负载电流已经下降到阈值之后，整个输出级被禁止。

5. 发明授权

US07196648B1 Non-integer decimation using cascaded intergrator-comb filter 有权
标题翻译：使用级联集成梳状滤波器的非整数抽取
公开(公告)号：US07196648B1
公开(公告)日：2007-03-27
申请号：US11317546
申请日：2005-12-23
申请人： Lei Ding , John L. Melanson , Xaiofan Fei , Johann Gaboriau
发明人： Lei Ding , John L. Melanson , Xaiofan Fei , Johann Gaboriau
IPC分类号： H03M1/66
CPC分类号： H03H17/0685 , H03H17/0671
摘要： A non-integer decimation filter for decimating an input value includes a first integrator for integrating the input value in an input sample domain at an input sample rate and for generating a first integral of the input value at its output and a second integrator for integrating the first integral of the input value in the input sample domain at the input sample rate and for generating a second integral at its output. A calculation network is coupled to the outputs of the first and second integrators for combining the outputs of the first and second integrators with corresponding coefficients to generate intermediate output values in an output sample domain. A differentiator is configured to receive the intermediate output values from the calculation network and to generate a decimated output value at an output sample rate in which the output sample rate has a non-integer factor with respect to the input sample rate.
摘要翻译：用于对输入值进行抽取的非整数抽取滤波器包括：第一积分器，用于以输入采样率对输入采样域中的输入值进行积分，并在其输出端产生输入值的第一积分;以及第二积分器，在输入采样率的输入采样域中的输入值的第一个积分，并在其输出端产生第二个积分。计算网络耦合到第一和第二积分器的输出，用于将第一和第二积分器的输出与相应系数组合，以在输出样本域中产生中间输出值。微分器被配置为从计算网络接收中间输出值，并且以输出采样率产生相对于输入采样率的非整数因子的输出采样率的抽取输出值。

6. 发明授权

US07554399B1 Protection circuit and method for protecting switching power amplifier circuits during reset 有权
标题翻译：在复位期间保护开关功率放大器电路的保护电路和方法
公开(公告)号：US07554399B1
公开(公告)日：2009-06-30
申请号：US11862324
申请日：2007-09-27
申请人： Johann Gaboriau , Lingli Zhang
发明人： Johann Gaboriau , Lingli Zhang
IPC分类号： H03F3/217
CPC分类号： H03F1/52 , H03F1/305 , H03F3/217 , H03F2200/03 , H03F2200/351
摘要： A protection circuit and method for protecting switching power amplifier circuits during reset provides protection against latch-up and other failures due to energy returned from an inductive load when the amplifier is reset. Upon receipt of a reset indication, rather than immediately disabling the switching power output stage, the switching power output stage is driven toward a fifty-percent duty cycle of operation for a time period so that energy stored in inductance of the load is reduced, preventing back-currents that would otherwise may cause latch-up of the output stage when the switching power output stage is disabled. After the time period has elapsed, the switching power output stage is disabled. Alternatively, the current through the inductive load is measured and the switching power stage is disabled after the magnitude of the current has fallen below a threshold.
摘要翻译：在复位期间保护开关功率放大器电路的保护电路和方法提供了保护，以防止当放大器被复位时由于感性负载返回的能量而导致的闩锁和其他故障。在接收到复位指示时，不是立即禁用开关功率输出级，所以开关功率输出级在一段时间内被驱动到操作的百分之五十的占空比，从而减少存储在负载的电感中的能量，从而防止当开关功率输出级被禁止时，否则可能导致输出级闭锁的反向电流。经过了一段时间后，开关电源输出级被禁止。或者，测量通过电感负载的电流，并且在电流的大小已经降到阈值以下之前禁用开关功率级。

7. 发明授权

US07432842B1 Multi-channel pulse width modulated signal interleave and inversion 有权
标题翻译：多通道脉宽调制信号交错和反演
公开(公告)号：US07432842B1
公开(公告)日：2008-10-07
申请号：US11613619
申请日：2006-12-20
申请人： John L. Melanson , Johann Gaboriau , Brian D. Trotter
发明人： John L. Melanson , Johann Gaboriau , Brian D. Trotter
IPC分类号： H03M3/00
CPC分类号： H03F3/68 , H03F3/2173
摘要： A multi-channel signal processing system reduces electromagnetic interference (EMI) by staggering pulse edges of one or more pulse-width modulated signals (PWM signals) to prevent pulse edge overlap with at least one of the other PWM signals and inverting at least one of the PWM signals. Staggering and inverting the PWM signals reduces the total EMI power at any given time generated by the multi-channel signal processing system. Pulse edges can be staggered by advancing or delaying a pulse edge for one or more channels. Pulses can be staggered and inverted using static interleave and inversion subsystems or dynamically using controllable interleave and inversion control systems. In at least one embodiment, the multi-channel signal processing system includes high power, half-bridge amplifiers for each channel. The timing and phases of the PWM signals can be determined to reduce EMI from the half-bridge amplifiers caused by the PWM signals.
摘要翻译：多通道信号处理系统通过交错一个或多个脉冲宽度调制信号（PWM信号）的脉冲边缘来减小电磁干扰（EMI），以防止与其它PWM信号中的至少一个的脉冲边缘重叠， PWM信号。 PWM信号的交错和反相减少了由多通道信号处理系统产生的任何给定时间的总EMI功率。通过推进或延迟一个或多个通道的脉冲边沿可以使脉冲边缘交错。脉冲可以使用静态交错和反转子系统进行交错和反转，或动态地使用可控交错和反转控制系统。在至少一个实施例中，多通道信号处理系统包括用于每个通道的大功率半桥放大器。可以确定PWM信号的时序和相位，以减少由PWM信号引起的半桥放大器的EMI。

8. 发明授权

US08093951B1 Pulse-width modulated (PWM) audio power amplifier having output signal magnitude controlled pulse voltage and switching frequency 有权
标题翻译：脉冲宽度调制（PWM）音频功率放大器具有输出信号幅值受控的脉冲电压和开关频率
公开(公告)号：US08093951B1
公开(公告)日：2012-01-10
申请号：US12568667
申请日：2009-09-28
申请人： Lingli Zhang , Dan Shen , Johann Gaboriau , Eric J. Swanson
发明人： Lingli Zhang , Dan Shen , Johann Gaboriau , Eric J. Swanson
IPC分类号： H03F3/217 , H03F3/04
CPC分类号： H03F3/217 , H03F2200/03 , H03F2200/114 , H03F2200/351
摘要： An audio switching power amplifier having an output pulse voltage selected in conformity with an indication of the output signal amplitude provides lower electromagnetic interference (EMI) in class-D amplifier implementations, in particular, in inductor-less designs. The output pulse voltage may be selected by providing multiple switching circuits, such as half or fully bridge switches, with each switching circuit connected to a different power supply. One of the switching circuits is activated by the switching controller, while the others are disabled, providing selection of the output pulse voltage. Selection of a lower pulse voltage, when the maximum voltage is not required, reduces the generated EMI. The switching frequency of the class-D amplifier may also be controlled in conformity with the output signal amplitude, so that at higher output levels a lower switching rate is selected, reducing the generated EMI.
摘要翻译：具有根据输出信号幅度的指示选择的输出脉冲电压的音频开关功率放大器在D类放大器实现中尤其是在无电感设计中提供较低的电磁干扰（EMI）。可以通过提供多个开关电路（例如半桥或全桥开关）来选择输出脉冲电压，每个开关电路连接到不同的电源。其中一个开关电路由开关控制器激活，而其他开关电路被禁用，提供输出脉冲电压的选择。当不需要最大电压时，选择较低的脉冲电压可以减少产生的EMI。 D类放大器的开关频率也可以根据输出信号幅度进行控制，从而在较高的输出电平下选择较低的开关速率，从而减少产生的EMI。

9. 发明授权

US07327296B1 Signal processing system with modified delta sigma modulator quantizer output signals to spread harmonic frequencies of pulse width modulator output signals 有权
标题翻译：信号处理系统采用改进的ΔΣ调制器量化器输出信号，以扩展脉宽调制器输出信号的谐波频率
公开(公告)号：US07327296B1
公开(公告)日：2008-02-05
申请号：US11534417
申请日：2006-09-22
申请人： Johann Gaboriau , John L. Melanson , Brian D. Trotter
发明人： Johann Gaboriau , John L. Melanson , Brian D. Trotter
IPC分类号： H03M3/00
CPC分类号： H03M3/358 , H03M3/506
摘要： The signal processing system includes a pulse width modulator (PWM) that receives input signals from a delta sigma modulator. The PWM generates an output signal having successive frames of PWM patterns. Modifying loop filter data, such as a loop filter output signal, of the delta sigma modulator modifies a delta-sigma modulator quantizer output signal, which in turn changes the frame-to-frame duty cycles of the pulse width modulator output. PWM patterns corresponding to substantially similar delta sigma modulator input signal levels have substantially identical pulse widths. The signal processing system shifts rising and falling edges of pulse width modulator output signals relative to pulse width modulated signals generated from unmodified signals by a quanta of time greater than any deviation between the pulse widths. The signal processing system shifts pulse edges of PWM patterns to spread the spectrum of intra-channel and inter-channel harmonic frequencies.
摘要翻译：信号处理系统包括从Δ-Σ调制器接收输入信号的脉宽调制器（PWM）。 PWM产生具有连续的PWM模式帧的输出信号。修改Δ-Σ调制器的环路滤波器输出信号的环路滤波器数据修改Δ-Σ调制器量化器输出信号，其进而改变脉宽调制器输出的帧到帧占空比。对应于基本相似的ΔΣ调制器输入信号电平的PWM模式具有基本相同的脉冲宽度。信号处理系统将脉冲宽度调制器输出信号的上升沿和下降沿相对于从未修改的信号产生的脉冲宽度调制信号偏移大于脉冲宽度之间的任何偏差的时间量。信号处理系统移位PWM模式的脉冲边沿以扩展通道内和频道间谐波频率的频谱。

10. 发明授权

US07209064B1 Signal processing system with spreading of a spectrum of harmonic frequencies of a pulse width modulator output signal 有权
标题翻译：信号处理系统，具有脉宽调制器输出信号频谱的频谱扩展
公开(公告)号：US07209064B1
公开(公告)日：2007-04-24
申请号：US11428210
申请日：2006-06-30
申请人： Johann Gaboriau , John L. Melanson
发明人： Johann Gaboriau , John L. Melanson
IPC分类号： H03M1/82
CPC分类号： H03M3/358 , H03M3/424 , H03M3/506
摘要： The signal processing system includes a pulse width modulator (PWM) that receives a quantizer output signal from a delta sigma modulator. Each quantizer output signal represents one of N quantization levels. For at least one of the quantization levels, the PWM can generate multiple, different PWM patterns. Thus, each quantization level in at least a subset of the N quantization levels is associated with at least two PWM patterns. In at least one embodiment, the subset of quantization levels represents the quantization of low level samples of a quantizer input signal. By associating multiple PWM patterns to at least the subset of the quantization levels, the pulse edges of the PWM patterns in a frame are shifted in time with respect to subsequent PWM patterns, which spreads the spectrum of harmonic frequencies of the PWM output signal. Spreading the spectrum of harmonic frequencies of the PWM output signal can reduce electromagnetic interference (EMI).
摘要翻译：信号处理系统包括从Δ-Σ调制器接收量化器输出信号的脉宽调制器（PWM）。每个量化器输出信号表示N个量化级中的一个。对于至少一个量化级别，PWM可以产生多个不同的PWM模式。因此，N个量化级的至少一个子集中的每个量化级与至少两个PWM模式相关联。在至少一个实施例中，量化级的子集表示量化器输入信号的低电平采样的量化。通过将多个PWM模式与至少量子化级别的子集相关联，帧中的PWM模式的脉冲边缘相对于随后的PWM模式在时间上移位，这扩展了PWM输出信号的谐波频率的频谱。扩展PWM输出信号的谐波频谱可以减少电磁干扰（EMI）。

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