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41. 发明授权

US06933871B2 Feedback steering delta-sigma modulators and systems using the same 有权
标题翻译：反馈转向Δ-Σ调制器和使用它的系统
公开(公告)号：US06933871B2
公开(公告)日：2005-08-23
申请号：US10379742
申请日：2003-03-05
申请人： John Laurence Melanson , Xiaofan Fei , Johann G. Gaboriau
发明人： John Laurence Melanson , Xiaofan Fei , Johann G. Gaboriau
IPC分类号： H03M20060101 , H03M3/00 , H03M7/32 , H03M7/34 , H03M7/36 , H03M7/38
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.
摘要翻译：数模转换器，包括用于接收输入信号的输入端，斜坡发生器和响应于输入信号和斜坡发生器输出的Δ-Σ调制器。 Δ-Σ调制器的噪声整形传递函数的顺序响应于斜坡发生器的输出电平。

42. 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。

43. 发明授权

US06724332B1 Noise shaping circuits and methods with feedback steering overload compensation and systems using the same 有权
标题翻译：噪声整形电路和方法具有反馈转向过载补偿和使用相同的系统
公开(公告)号：US06724332B1
公开(公告)日：2004-04-20
申请号：US10217368
申请日：2002-08-13
申请人： John Laurence Melanson
发明人： John Laurence Melanson
IPC分类号： H03M300
CPC分类号： H03M7/3011 , H03M7/3026 , H03M7/3033
摘要： A noise shaper includes a first feedback loop for noise shaping a first feedback signal under normal operating conditions and having a first filter with a first signal transfer function and a second feedback loop that is stable under overload conditions and has a second filter having a second signal transfer function differing from the first signal transfer function. The noise shaper also includes an output circuit block including a quantizer and steering circuitry. The quantizer includes an input simultaneously responsive to outputs of the first and second filters. The steering circuitry steers a feedback from an output of the quantizer to input of the first and second feedback loops. The steering circuitry steers feedback from output of the quantizer to inputs of the first and second feedback loops, the steering circuitry including a first output for providing the first feedback signal to the first feedback loop and a second output for providing a second feedback signal to the second feedback loop.
摘要翻译：噪声整形器包括用于在正常操作条件下对第一反馈信号进行噪声整形并且具有第一信号传递函数的第一滤波器和在过载条件下稳定的第二反馈环路的第一反馈环路，并且具有第二滤波器，该第二滤波器具有第二信号传递函数不同于第一信号传递函数。噪声整形器还包括包括量化器和转向电路的输出电路块。量化器包括同时响应于第一和第二滤波器的输出的输入。转向电路将来自量化器的输出的反馈引导到第一和第二反馈回路的输入。转向电路将来自量化器的输出的反馈转换为第一和第二反馈回路的输入，转向电路包括用于向第一反馈回路提供第一反馈信号的第一输出和用于向第一反馈回路提供第二反馈信号的第二输出第二反馈回路。

44. 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。

45. 发明授权

US06449569B1 Calibration and compensation of delta sigma ADC's and DAC's by correlating noise signals 有权
标题翻译：通过相关噪声信号校准和补偿Δ-ΣADC和DAC
公开(公告)号：US06449569B1
公开(公告)日：2002-09-10
申请号：US09457014
申请日：1999-12-08
申请人： John Laurence Melanson
发明人： John Laurence Melanson
IPC分类号： H03M110
CPC分类号： H03M3/38 , H03M3/378 , H03M3/458 , H03M3/50
摘要： The present invention correlates noise from a delta sigma modulator with noise from the same modulator passed through a nonlinear block whose purpose is to isolate the imperfection being measured. Once the imperfection is measured the results may be used to correct the output of the delta sigma modulator, to accept or reject chips or for other purposes.
摘要翻译：本发明将来自ΔΣ调制器的噪声与来自同一调制器的噪声相关联，该噪声通过非线性块，其目的是隔离被测量的不完美。一旦测量不完整，结果可用于校正delta-Σ调制器的输出，接受或拒绝芯片或用于其他目的。

46. 发明授权

US06414614B1 Power output stage compensation for digital output amplifiers 有权
标题翻译：数字输出放大器的功率输出级补偿
公开(公告)号：US06414614B1
公开(公告)日：2002-07-02
申请号：US09510035
申请日：2000-02-22
申请人： John Laurence Melanson
发明人： John Laurence Melanson
IPC分类号： H03M300
CPC分类号： H03F3/217 , H03F1/32 , H03F2200/351 , H03M3/358 , H03M3/506
摘要： Circuitry is provided to compensate for distortion introduced into the output signal of a delta sigma digital to analog converter (DAC) by the power output stage of the amplifier. Such distortion is not consistent for a given output data value or short series of data values, but must be either measured and corrected in real time or must be corrected in real time based upon a sophisticated model of the system that predicts the distortion. Correction is applied to one or more feedback loops in the delta sigma converter. Distortion caused by fluctuations in the power supply voltage may also be modeled and corrected in real time.
摘要翻译：提供电路以补偿由放大器的功率输出级引入到ΔΣ数模转换器（DAC）的输出信号中的失真。对于给定的输出数据值或短系列数据值，这种失真不一致，但必须实时测量和校正，或者必须基于预测失真的系统的复杂模型实时校正。校正被应用于Δ-Σ转换器中的一个或多个反馈回路。电源电压波动引起的失真也可以实时建模和校正。

47. 发明授权

US06344811B1 Power supply compensation for noise shaped, digital amplifiers 有权
标题翻译：噪声形状数字放大器的电源补偿
公开(公告)号：US06344811B1
公开(公告)日：2002-02-05
申请号：US09526784
申请日：2000-03-16
申请人： John Laurence Melanson
发明人： John Laurence Melanson
IPC分类号： H03M300
CPC分类号： H03F1/3241 , H03F3/217 , H03F2200/331 , H03M3/354 , H03M3/388 , H03M3/506
摘要： The digital amplifier of the present invention comprises a delta sigma noise shaper feeding a pulse wave modulator (PWM) which drives a load such as a speaker. The amplifier includes circuitry to measure the voltage coming out of the power supply in the circuit, and using this measurement as a control signal to modify the feedback path and direct path of the noise shaper, in order to correct the pulse width output to compensate for the varying power supply voltages. The amplifier may also include circuitry to correct for the nonlinear effects of pulse wave modulation, by correcting the feedback applied to one stage of the noise shaper such that it is nontrivially different from the feedback applied to another stage.
摘要翻译：本发明的数字放大器包括一个进给脉冲波调制器（PWM）的Δ-Σ噪声整形器，该脉冲波调制器（PWM）驱动诸如扬声器的负载。放大器包括用于测量电路中电源的电压的电路，并且使用该测量作为控制信号来修改噪声整形器的反馈路径和直接路径，以便校正脉冲宽度输出以补偿变化的电源电压。放大器还可以包括校正脉冲波调制的非线性效应的电路，通过校正施加到噪声整形器的一个级的反馈，使得其与施加到另一级的反馈非常不同。

48. 发明授权

US6150969A Correction of nonlinear output distortion in a Delta Sigma DAC 有权
标题翻译： Delta Sigma DAC中非线性输出失真的校正
公开(公告)号：US6150969A
公开(公告)日：2000-11-21
申请号：US163235
申请日：1998-09-29
申请人： John Laurence Melanson
发明人： John Laurence Melanson
IPC分类号： G06F1/025 , H03M3/04 , H03M7/36 , H03M3/00
CPC分类号： G06F1/025 , H03M3/388 , H03M7/304 , H03M3/506 , H03M7/3026
摘要： A delta sigma modulator of at least second order includes correction means applied to each feedback loop in the modulator, to account for systemic nonlinear output distortions. Since the output distortion is nonlinear, the correction applied to each feedback loop is nontrivially different. Such a corrected delta sigma modulator may be used in a demodulator including an output digital to analog converter (DAC) to account for systemic imperfections in the pulses formed by the DAC. The corrected delta sigma modulator is also useful in correcting output errors associated with high quality multilevel demodulators and class D power amplifiers. The corrected delta sigma modulator may be one bit or multilevel.
摘要翻译：至少二阶的ΔΣ调制器包括施加到调制器中的每个反馈回路的校正装置，以解决系统非线性输出失真。由于输出失真是非线性的，所以施加到每个反馈回路的校正是非常不同的。这种校正的Δ-Σ调制器可以用在包括输出数模转换器（DAC）的解调器中，以解决由DAC形成的脉冲中的系统缺陷。校正的Δ-Σ调制器也可用于校正与高质量多电平解调器和D类功率放大器相关联的输出误差。校正的Δ-Σ调制器可以是一位或多级。

49. 发明授权

US5815102A Delta sigma pwm dac to reduce switching 失效
标题翻译： Delta sigma pwm dac减少切换
公开(公告)号：US5815102A
公开(公告)日：1998-09-29
申请号：US662873
申请日：1996-06-12
申请人： John Laurence Melanson
发明人： John Laurence Melanson
IPC分类号： G06F1/025 , H03M3/04 , H03M7/36 , H03M3/00
CPC分类号： H03M7/304 , G06F1/025 , H03M3/388 , H03M3/506 , H03M7/3026
摘要： A digital to analog (D/A) converter for hearing aids and the like includes a delta sigma modulator and a duty cycle demodulator. The delta sigma modulator converts medium rate, high resolution data into medium rate, medium resolution data, and the duty cycle demodulator converts the medium rate, medium resolution data into low resolution, high rate data. The duty cycle demodulator utilizes a lookup function to format the output data in a format having lowered transition rates, resulting in lower power use. The delta sigma converter may include a correction factor in at least one of its feedback loops to compensate for the characteristics of the output data from the duty cycle demodulator.
摘要翻译：用于助听器的数模（D / A）转换器等包括ΔΣ调制器和占空比解调器。 ΔΣ调制器将中等速率，高分辨率数据转换为中等速率，中等分辨率数据，占空比解调器将中等速率，中等分辨率数据转换为低分辨率，高速率数据。占空比解调器利用查找功能将输出数据格式化为具有降低的转换速率的格式，导致较低的功率使用。 ΔΣ转换器可以在其反馈回路中的至少一个中包括校正因子，以补偿来自占空比解调器的输出数据的特性。

50. 发明授权

US4106011A Keyboard circuit 失效
标题翻译：键盘电路
公开(公告)号：US4106011A
公开(公告)日：1978-08-08
申请号：US625611
申请日：1975-10-24
申请人： John Laurence Melanson , Richard Allen Springer , Jack Duane Grimes , Jack Arthur Gilmore
发明人： John Laurence Melanson , Richard Allen Springer , Jack Duane Grimes , Jack Arthur Gilmore
IPC分类号： G06F3/02 , G06F3/023 , G06F9/48 , H03M11/00 , H03M11/20 , G08C25/00
CPC分类号： H03M11/003
摘要： A simplified keyboard for a terminal device, calculator, or the like, in which each key is sequentially scanned and parallel key code data is sent to an entry register. A pair of flip-flops in combination with firmware ascertain that only valid key code data is sent to the entry register for utilization by the system, providing double entry and key bounce protection. The firmware further provides N-key rollover and auto repeat with a variable repeat rate, and expands the keyboard from a single-mode to an eight-mode capability.
摘要翻译：用于终端设备，计算器等的简化键盘，其中每个键被顺序扫描，并且并行键码数据被发送到入口寄存器。与固件组合的一对触发器确定只有有效的密钥代码数据被发送到入口寄存器以供系统利用，提供双重输入和关键跳跃保护。该固件进一步提供N键翻转和自动重复的可重复速率，并将键盘从单模式扩展到八模式功能。

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