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1. 发明授权

US06897715B2 Multimode voltage regulator 有权
标题翻译：多模电压调节器
公开(公告)号：US06897715B2
公开(公告)日：2005-05-24
申请号：US10435862
申请日：2003-05-12
申请人： Thomas James Barber, Jr. , Stacy Ho , Paul Ferguson, Jr.
发明人： Thomas James Barber, Jr. , Stacy Ho , Paul Ferguson, Jr.
IPC分类号： G05F1/56 , G05F1/563 , G05F1/575 , G05F1/59 , H02M3/158 , G05F1/10
CPC分类号： H02M3/1584 , G05F1/56 , G05F1/575 , H02M2001/0032 , H02M2001/0045 , Y02B70/16
摘要： A multimode voltage regulator includes a low current pass device and a high current pass device each adapted for connection between a power supply and a load; an error amplifier responsive to a difference between a reference voltage and a function of the voltage on the load to produce an error signal; and a low power driver responsive in a low load power mode to an error signal for operating the low current pass device to provide low power to the load and a high power driver responsive in a high load power mode to an error signal for operating the high current pass device to provide high power to the load for maintaining efficiency over high and low power load operation.
摘要翻译：多模式电压调节器包括低电流通过器件和高电流通过器件，每个器件适于电源和负载之间的连接; 误差放大器，其响应于参考电压和负载上的电压的函数之间的差异，以产生误差信号; 以及低功率驱动器，其以低负载功率模式响应于用于操作低电流通过装置以向负载提供低功率的误差信号和响应于高负载功率模式的高功率驱动器用于操作高电平的误差信号电流通过装置，用于向负载提供高功率以在高功率和低功率负载操作下保持效率。

2. 发明申请

US20170033801A1 METHOD AND APPARATUS FOR EXCESS LOOP DELAY COMPENSATION IN DELTA-SIGMA MODULATOR 审中-公开
标题翻译：在DELTA-SIGMA调制器中进行循环延迟补偿的方法和装置
公开(公告)号：US20170033801A1
公开(公告)日：2017-02-02
申请号：US15112691
申请日：2015-01-20
申请人： Chi-Lun LO , Stacy HO , MediaTek Singapore Pte. Ltd.
发明人： Chi-Lun Lo , Stacy Ho
IPC分类号： H03M3/00
CPC分类号： H03M3/422 , H03M3/37 , H03M3/424 , H03M3/50
摘要： A delta-sigma modulator includes a signal subtraction circuit, a loop filter, a quantizer, a digital-to-analog converter (DAC), and a control circuit. The signal subtraction circuit subtracts an analog feedback signal from an analog input signal to generate a difference signal. The loop filter performs a filtering operation upon the difference signal to generate a filtered signal. The quantizer quantizes the filtered signal into a digital out put signal, wherein at least one inherent circuit characteristic of the quantizer are adjusted in response to a digital code input. The DAC generates the analog feedback signal according to the digital output signal. The control circuit generates the digital code input to the quantizer for setting an excess loop delay (ELD) compensation.
摘要翻译： Δ-Σ调制器包括信号减法电路，环路滤波器，量化器，数模转换器（DAC）和控制电路。信号减法电路从模拟输入信号中减去模拟反馈信号，生成差分信号。环路滤波器对差分信号执行滤波操作以产生滤波信号。量化器将经滤波的信号量化为数字输出信号，其中响应于数字代码输入调整量化器的至少一个固有电路特性。 DAC根据数字输出信号产生模拟反馈信号。控制电路产生输入到量化器的数字代码，用于设定多余的循环延迟（ELD）补偿。

3. 发明授权

US07969340B2 Noise-shaped segmented digital-to-analog converter 有权
标题翻译：噪声分段数模转换器
公开(公告)号：US07969340B2
公开(公告)日：2011-06-28
申请号：US12507454
申请日：2009-07-22
申请人： Chih-hong Lou , Kuan-hung Chen , Stacy Ho
发明人： Chih-hong Lou , Kuan-hung Chen , Stacy Ho
IPC分类号： H03M3/00
CPC分类号： H03M7/3033 , H03M1/0673 , H03M1/682 , H03M1/747 , H03M3/502 , H03M7/3022
摘要： A segmented digital-to-analog converter (DAC) is disclosed. In the present invention, the segmented DAC of the present invention comprises a signal component processing stage and a plurality of noise component processing stages cascaded with the signal component processing stage. A noise component of an input word for the DAC is split into a plurality of portions to be processed. By doing so, effect due to gain mismatch(es) in an analog portion of the DAC can be effectively reduced without significantly increasing DAC cells used in the DAC.
摘要翻译：公开了一种分段数模转换器（DAC）。在本发明中，本发明的分段DAC包括信号分量处理级和与信号分量处理级级联的多个噪声分量处理级。 DAC的输入字的噪声分量被分割成待处理的多个部分。通过这样做，可以有效地减少由于DAC的模拟部分中的增益失配产生的影响，而不会显着增加在DAC中使用的DAC单元。

4. 发明授权

US06819165B2 Voltage regulator with dynamically boosted bias current 有权
标题翻译：具有动态提升偏置电流的稳压器
公开(公告)号：US06819165B2
公开(公告)日：2004-11-16
申请号：US10435861
申请日：2003-05-12
申请人： Stacy Ho , Thomas James Barber, Jr.
发明人： Stacy Ho , Thomas James Barber, Jr.
IPC分类号： G06F110
CPC分类号： G05F3/262 , G05F1/575 , H02M3/1584 , H02M2001/0032 , H02M2001/0045 , Y02B70/16
摘要： A voltage regulator with dynamically boosted bias current includes a pass device for providing current to a load; an error circuit responsive to a difference between a predetermined reference voltage and a function of the voltage on the load to produce an error signal, a driver circuit responsive to the error signal for controlling the pass device to adjust the current to the load to reduce the error signal, the driver circuit including an amplifier responsive to the error signal for controlling the pass device, a bias current source for biasing the amplifier, a sensing circuit for sensing a portion of the error signal, a reference current source for providing a reference current, a second error circuit responsive to a difference between the portion of the error signal and the reference current to produce a second error current; and a boost circuit responsive to the second error signal to increase the bias current provided to the amplifier when the load demands more current.
摘要翻译：具有动态升压偏置电流的电压调节器包括用于向负载提供电流的通过装置; 响应于预定参考电压和负载上的电压的函数之间的差异产生误差信号的误差电路，响应于误差信号的驱动器电路，用于控制通过装置以调节到负载的电流以减少误差信号，所述驱动电路包括响应于用于控制通过装置的误差信号的放大器，用于偏置放大器的偏置电流源，用于感测误差信号的一部分的感测电路，用于提供参考电流的参考电流源响应于所述误差信号的所述部分与所述参考电流之间的差异产生第二误差电流的第二误差电路; 以及响应于第二误差信号的升压电路，以在负载需要更多电流时增加提供给放大器的偏置电流。

5. 发明授权

US06695778B2 Methods and systems for construction of ultrasound images 失效
标题翻译：超声图像构建方法与系统
公开(公告)号：US06695778B2
公开(公告)日：2004-02-24
申请号：US10190079
申请日：2002-07-03
申请人： Polina Golland , Stacy Ho
发明人： Polina Golland , Stacy Ho
IPC分类号： A61B800
CPC分类号： G01S15/8977 , G01S7/5205 , G01S7/52074 , Y10S128/916
摘要： The present invention provides methods and systems for generating ultrasound images of a plurality of scatterers disposed in a target region. More particularly, a method of the invention derives model response functions for each of a plurality of transducers for a given distribution of scattering media. The interrogation pattern can be selected to include a set of unfocused ultrasound waves generated by one or more of the transducers. The interrogation pattern is transmitted into the target region, and the transducers are utilized to detect echoes generated by the scatterers in the target region in response to the interrogation pattern. The methods and systems of the invention advantageously allow obtaining ultrasound images of a target region without employing beamforming either in transmission of ultrasound waves into the region or in detection of echoes generated by scatterers in the target region in response to the transmitted waves.
摘要翻译：本发明提供了用于产生设置在目标区域中的多个散射体的超声图像的方法和系统。更具体地，本发明的方法为散射介质的给定分布导出多个换能器中的每一个的模型响应函数。可以选择询问模式以包括由一个或多个换能器产生的一组未聚焦的超声波。询问模式被传送到目标区域，并且换能器用于响应于询问模式来检测由目标区域中的散射体产生的回波。本发明的方法和系统有利地允许获得目标区域的超声波图像，而不需要在将超声波传输到该区域中或者在检测由响应于发射波的目标区域中的散射体产生的回波时使用波束形成。

6. 发明申请

US20110018753A1 NOISE-SHAPED SEGMENTED DIGITAL-TO-ANALOG CONVERTER 有权
标题翻译：噪声分离的数字到模拟转换器
公开(公告)号：US20110018753A1
公开(公告)日：2011-01-27
申请号：US12507454
申请日：2009-07-22
申请人： Chih-hong Lou , Kuan-hung Chen , Stacy Ho
发明人： Chih-hong Lou , Kuan-hung Chen , Stacy Ho
IPC分类号： H03M1/66
CPC分类号： H03M7/3033 , H03M1/0673 , H03M1/682 , H03M1/747 , H03M3/502 , H03M7/3022
摘要： A segmented digital-to-analog converter (DAC) is disclosed. In the present invention, the segmented DAC of the present invention comprises a signal component processing stage and a plurality of noise component processing stages cascaded with the signal component processing stage. A noise component of an input word for the DAC is split into a plurality of portions to be processed. By doing so, effect due to gain mismatch(es) in an analog portion of the DAC can be effectively reduced without significantly increasing DAC cells used in the DAC
摘要翻译：公开了一种分段数模转换器（DAC）。在本发明中，本发明的分段DAC包括信号分量处理级和与信号分量处理级级联的多个噪声分量处理级。 DAC的输入字的噪声分量被分割成待处理的多个部分。通过这样做，可以有效地减少由于DAC的模拟部分中的增益失配而产生的影响，而不会显着增加DAC中使用的DAC单元

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