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公开(公告)号：US07952508B2
公开(公告)日：2011-05-31
申请号：US12553004
申请日：2009-09-02
申请人： Lorenzo Crespi , Ketan B Patel , Kyehyung Lee
发明人： Lorenzo Crespi , Ketan B Patel , Kyehyung Lee
IPC分类号： H03M1/66
CPC分类号： H03M1/066 , H03F3/217 , H03M1/822 , H03M3/502 , H03M7/3028 , H03M7/3037
摘要： Class-D amplifiers have evolved from using binary pulse-width modulation (PWM) modulators to three-level PWM modulators. Three-level PWM drivers for audio applications offer the benefits of eliminating costly elements at the output of an audio system. However, they also introduce increased common-mode interference. Three-level PWM generates three states, but one state has two interchangeable representations which can be scrambled in order to shape the common-mode output spectrum.
摘要翻译： D类放大器已经从使用二进制脉宽调制（PWM）调制器演进到三电平PWM调制器。 用于音频应用的三级PWM驱动器提供消除音频系统输出的昂贵元素的优点。 然而，它们也引入增加的共模干扰。 三电平PWM产生三个状态，但是一个状态具有两个可互换的表示，其可被加扰以形成共模输出频谱。
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公开(公告)号：US20110050467A1
公开(公告)日：2011-03-03
申请号：US12553004
申请日：2009-09-02
申请人： Lorenzo Crespi , Ketan B. Patel , Kyehyung Lee
发明人： Lorenzo Crespi , Ketan B. Patel , Kyehyung Lee
IPC分类号： H03M7/00
CPC分类号： H03M1/066 , H03F3/217 , H03M1/822 , H03M3/502 , H03M7/3028 , H03M7/3037
摘要： Class-D amplifiers have evolved from using binary pulse-width modulation (PWM) modulators to three-level PWM modulators. Three-level PWM drivers for audio applications offer the benefits of eliminating costly elements at the output of an audio system. However, they also introduce increased common-mode interference. Three-level PWM generates three states, but one state has two interchangeable representations which can be scrambled in order to shape the common-mode output spectrum.
摘要翻译： D类放大器已经从使用二进制脉宽调制（PWM）调制器演进到三电平PWM调制器。 用于音频应用的三级PWM驱动器提供消除音频系统输出的昂贵元素的优点。 然而，它们也引入增加的共模干扰。 三电平PWM产生三个状态，但是一个状态具有两个可互换的表示，其可被加扰以形成共模输出频谱。
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公开(公告)号：US20130141829A1
公开(公告)日：2013-06-06
申请号：US13625641
申请日：2012-09-24
IPC分类号： H02H9/02
CPC分类号： H02H9/02 , G06F1/266 , G06F2213/0042
摘要： An apparatus for detecting and controlling current. A current detector for generating a first value that represents an amount of current being delivered to a device. A current limit circuit for generating a second value that represents a maximum permitted current level from a current source. A current controller for controlling the amount of current drawn by the device if the first value exceeds the second value.
摘要翻译： 一种用于检测和控制电流的装置。 一种电流检测器，用于产生表示传送到设备的电流量的第一值。 一个用于产生表示来自当前源的最大允许电流电平的第二值的电流限制电路。 一种电流控制器，用于如果所述第一值超过所述第二值，则控制由所述装置吸取的电流量。
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公开(公告)号：US08274772B2
公开(公告)日：2012-09-25
申请号：US12341753
申请日：2008-12-22
CPC分类号： H02H9/02 , G06F1/266 , G06F2213/0042
摘要： An apparatus for detecting and controlling current. A current detector for generating a first value that represents an amount of current being delivered to a device. A current limit circuit for generating a second value that represents a maximum permitted current level from a current source. A current controller for controlling the amount of current drawn by the device if the first value exceeds the second value.
摘要翻译： 一种用于检测和控制电流的装置。 一种电流检测器，用于产生表示传送到设备的电流量的第一值。 一个用于产生表示来自当前源的最大允许电流电平的第二值的电流限制电路。 一种电流控制器，用于如果所述第一值超过所述第二值，则控制由所述装置吸取的电流量。
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5.发明申请SYSTEMS AND METHODS FOR DRIVING HIGH POWER STATES USING LOWER VOLTAGE PROCESSES 有权使用低电压过程驱动高功率状态的系统和方法公开(公告)号：US20110156793A1
公开(公告)日：2011-06-30
申请号：US13041065
申请日：2011-03-04
申请人： Christian Larsen , Lorenzo Crespi , Ketan B. Patel
发明人： Christian Larsen , Lorenzo Crespi , Ketan B. Patel
IPC分类号： H03L5/00
CPC分类号： H03K17/102
摘要： A battery assisted level shifter comprises a pull up transistor pulling up an output when a received input signal is high, a pull down transistor pulling down the output when the received input signal is low, and a battery element to provide voltage offsets. The battery element can be implemented using one or more pull-up transistors for assisting with pulling up the output. The level shifter can be used in class-D amplifiers, DC-DC power converters and interfaces between circuits having different reference voltages.
摘要翻译： 电池辅助电平移位器包括在接收到的输入信号为高时提升输出的上拉晶体管，当所接收的输入信号为低电平时下拉输出的下拉晶体管以及提供电压偏移的电池元件。 电池元件可以使用一个或多个上拉晶体管来实现，以帮助提升输出。 电平转换器可用于D类放大器，DC-DC电源转换器和具有不同参考电压的电路之间的接口。
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公开(公告)号：US20100157498A1
公开(公告)日：2010-06-24
申请号：US12341753
申请日：2008-12-22
申请人： James Skov , Lorenzo Crespi , Ketan B. Patel
发明人： James Skov , Lorenzo Crespi , Ketan B. Patel
IPC分类号： H02H9/08
CPC分类号： H02H9/02 , G06F1/266 , G06F2213/0042
摘要： An apparatus for detecting and controlling current. A current detector for generating a first value that represents an amount of current being delivered to a device. A current limit circuit for generating a second value that represents a maximum permitted current level from a current source. A current controller for controlling the amount of current drawn by the device if the first value exceeds the second value.
摘要翻译： 一种用于检测和控制电流的装置。 一种电流检测器，用于产生表示传送到设备的电流量的第一值。 一个用于产生表示来自当前源的最大允许电流电平的第二值的电流限制电路。 一种电流控制器，用于如果所述第一值超过所述第二值，则控制由所述装置吸取的电流量。
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公开(公告)号：US08659342B2
公开(公告)日：2014-02-25
申请号：US13289926
申请日：2011-11-04
IPC分类号： H03L5/00
CPC分类号： H03K19/018528 , H03K3/356182
摘要： A level shifter comprising a first driver transistor receiving an input signal. A gate-controlled transistor coupled to the first driver transistor. A second driver transistor coupled to the gate controlled transistor. An output coupled to the second driver transistor, wherein the gate-controlled transistor is for receiving a predetermined gate voltage when the output voltage exceeds a predetermined value.
摘要翻译： 一种电平移位器，包括接收输入信号的第一驱动晶体管。 耦合到第一驱动晶体管的栅极控制晶体管。 耦合到栅极控制晶体管的第二驱动晶体管。 耦合到第二驱动器晶体管的输出，其中，当输出电压超过预定值时，栅极控制晶体管用于接收预定的栅极电压。
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8.发明授权公开(公告)号：US08044690B2
公开(公告)日：2011-10-25
申请号：US12574663
申请日：2009-10-06
IPC分类号： H03K4/06
摘要： A triangular waveform generator is converted to a free running oscillator controlled by a calibration code. The free running oscillator can be synchronized to an external clock signal by comparing the external clock frequency to the frequency of the triangular waveform and adjusting the calibration code until the discrepancy in frequency is minimized.
摘要翻译： 三角形波形发生器转换为由校准码控制的自由振荡振荡器。 通过将外部时钟频率与三角波形的频率进行比较并调整校准代码，可以将自由振荡器与外部时钟信号同步，直到频率偏差最小化为止。
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9.发明申请公开(公告)号：US20110080191A1
公开(公告)日：2011-04-07
申请号：US12574663
申请日：2009-10-06
IPC分类号： H02M7/5395
摘要： A triangular waveform generator is converted to a free running oscillator controlled by a calibration code. The free running oscillator can be synchronized to an external clock signal by comparing the external clock frequency to the frequency of the triangular waveform and adjusting the calibration code until the discrepancy in frequency is minimized.
摘要翻译： 三角形波形发生器转换为由校准码控制的自由振荡振荡器。 通过将外部时钟频率与三角波形的频率进行比较并调整校准代码，可以将自由振荡器与外部时钟信号同步，直到频率偏差最小化为止。
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10.发明申请Systems and Methods for Driving High Power Stages Using Lower Voltage Processes 有权使用低电压工艺驱动大功率阶段的系统和方法公开(公告)号：US20100214000A1
公开(公告)日：2010-08-26
申请号：US12390333
申请日：2009-02-20
申请人： Lorenzo Crespi , Ketan B. Patel
发明人： Lorenzo Crespi , Ketan B. Patel
IPC分类号： H03K19/0175
CPC分类号： H03K17/102
摘要： In today's environment class-D amplifiers are used to provide an integrated solution for applications such as powered audio devices due to their advantages in power consumption and size over more traditional analog amplifiers. Due to power output requirements, the output stages of power drivers such as class-D amplifiers require a supply voltage in excess of the technologically allowed voltage for the switches in the output stage. A level shifter is used to ensure voltages supplied to the output switches do not exceed the technological limits. An ideal level shifter should provide the optimal voltage swing to output switches under all process, supply voltage and temperature (PVT) variations. The ideal level shifter should also provide fast transitions when the control signal changes from high to low and low to high.
摘要翻译： 在当今的环境中，D类放大器用于为诸如有源音频设备等应用提供集成解决方案，因为它们在功耗和尺寸上比传统模拟放大器具有优势。 由于功率输出要求，诸如D类放大器的功率驱动器的输出级需要超过输出级中的开关的技术允许电压的电源电压。 电平移位器用于确保提供给输出开关的电压不超过技术限制。 理想的电平转换器应在所有过程，电源电压和温度（PVT）变化下为输出开关提供最佳的电压摆幅。 当控制信号从高电平变为低电平和低电平变为高电平时，理想电平转换器也应提供快速转换。
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