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1. 发明申请

US20120062320A1 ANTI-POP CIRCUIT 有权
标题翻译：反向电话
公开(公告)号：US20120062320A1
公开(公告)日：2012-03-15
申请号：US13300012
申请日：2011-11-18
申请人： Xin Fan , Christian Larsen , Lorenzo Crespi
发明人： Xin Fan , Christian Larsen , Lorenzo Crespi
IPC分类号： H03F3/26
CPC分类号： H03F1/305 , H03F3/3022 , H03F3/45183 , H03F2200/144 , H03F2203/45526 , H03F2203/45534 , H03F2203/45674
摘要： Presently many audio chips suffer from pop issues, which is especially serious for single ended audio drivers. An audio pop is a disturbance in the output caused by a sudden transition of chip power, particularly when a chip is powered on or powered off. Furthermore, compensation networks included in the amplifiers on audio chips for stability offer a significant path for transmitting power disturbances to the output. Hence, circuitry is developed to suppress pops in the output stages of an amplifier.
摘要翻译：目前许多音频芯片遭受流行问题，对于单端音频驱动程序来说尤其严重。音频弹奏是由芯片功率的突然转换引起的输出干扰，特别是当芯片通电或断电时。此外，用于稳定性的用于音频芯片的放大器中的补偿网络提供了将功率干扰发送到输出的重要路径。因此，开发电路以抑制放大器的输出级中的弹出。

2. 发明申请

US20100321112A1 Anti-Pop Circuit 有权
标题翻译：反流行电路
公开(公告)号：US20100321112A1
公开(公告)日：2010-12-23
申请号：US12488438
申请日：2009-06-19
申请人： Xin Fan , Christian Larsen , Lorenzo Crespi
发明人： Xin Fan , Christian Larsen , Lorenzo Crespi
IPC分类号： H03F3/45 , H03F3/16 , H03F1/38
CPC分类号： H03F1/305 , H03F3/3022 , H03F3/45183 , H03F2200/144 , H03F2203/45526 , H03F2203/45534 , H03F2203/45674
摘要： Presently many audio chips suffer from pop issues, which is especially serious for single ended audio drivers. An audio pop is a disturbance in the output caused by a sudden transition of chip power, particularly when a chip is powered on or powered off. Furthermore, compensation networks included in the amplifiers on audio chips for stability offer a significant path for transmitting power disturbances to the output. Hence, circuitry is developed to suppress pops in the output stages of an amplifier.
摘要翻译：目前许多音频芯片遭受流行问题，对于单端音频驱动程序来说尤其严重。音频弹奏是由芯片功率的突然转换引起的输出干扰，特别是当芯片通电或断电时。此外，用于稳定性的用于音频芯片的放大器中的补偿网络提供了将功率干扰发送到输出的重要路径。因此，开发电路以抑制放大器的输出级中的弹出。

3. 发明授权

US08063699B2 Anti-pop circuit 有权
标题翻译：防爆电路
公开(公告)号：US08063699B2
公开(公告)日：2011-11-22
申请号：US12488438
申请日：2009-06-19
申请人： Xin Fan , Christian Larsen , Lorenzo Crespi
发明人： Xin Fan , Christian Larsen , Lorenzo Crespi
IPC分类号： H03F1/14
CPC分类号： H03F1/305 , H03F3/3022 , H03F3/45183 , H03F2200/144 , H03F2203/45526 , H03F2203/45534 , H03F2203/45674
摘要： Presently many audio chips suffer from pop issues, which is especially serious for single ended audio drivers. An audio pop is a disturbance in the output caused by a sudden transition of chip power, particularly when a chip is powered on or powered off. Furthermore, compensation networks included in the amplifiers on audio chips for stability offer a significant path for transmitting power disturbances to the output. Hence, circuitry is developed to suppress pops in the output stages of an amplifier.
摘要翻译：目前许多音频芯片遭受流行问题，对于单端音频驱动程序来说尤其严重。音频弹奏是由芯片功率的突然转换引起的输出干扰，特别是当芯片通电或断电时。此外，用于稳定性的用于音频芯片的放大器中的补偿网络提供了将功率干扰发送到输出的重要路径。因此，开发电路以抑制放大器的输出级中的弹出。

4. 发明授权

US08446216B2 Anti-pop circuit 有权
标题翻译：防爆电路
公开(公告)号：US08446216B2
公开(公告)日：2013-05-21
申请号：US13300012
申请日：2011-11-18
申请人： Xin Fan , Christian Larsen , Lorenzo Crespi
发明人： Xin Fan , Christian Larsen , Lorenzo Crespi
IPC分类号： H03F1/14
CPC分类号： H03F1/305 , H03F3/3022 , H03F3/45183 , H03F2200/144 , H03F2203/45526 , H03F2203/45534 , H03F2203/45674
摘要： Presently many audio chips suffer from pop issues, which is especially serious for single ended audio drivers. An audio pop is a disturbance in the output caused by a sudden transition of chip power, particularly when a chip is powered on or powered off. Furthermore, compensation networks included in the amplifiers on audio chips for stability offer a significant path for transmitting power disturbances to the output. Hence, circuitry is developed to suppress pops in the output stages of an amplifier.
摘要翻译：目前许多音频芯片遭受流行问题，对于单端音频驱动程序来说尤其严重。音频弹奏是由芯片功率的突然转换引起的输出干扰，特别是当芯片通电或断电时。此外，用于稳定性的用于音频芯片的放大器中的补偿网络提供了将功率干扰发送到输出的重要路径。因此，开发电路以抑制放大器的输出级中的弹出。

5. 发明授权

US08344797B2 Systems and methods for offset cancellation method for DC-coupled audio drivers 有权
标题翻译：用于直流耦合音频驱动器的偏移消除方法的系统和方法
公开(公告)号：US08344797B2
公开(公告)日：2013-01-01
申请号：US12623202
申请日：2009-11-20
申请人： Lorenzo Crespi , Christian Larsen
发明人： Lorenzo Crespi , Christian Larsen
IPC分类号： H03F1/02
CPC分类号： H03F1/301 , H03F1/305 , H03F3/45986
摘要： Direct current (DC) offset in and audio driver can cause a constant drain on power even when there is no sound. Furthermore it can cause an audible pop when the audio driver is enabled. A scaled replica output stage can be employed to perform DC offset cancellation offline during a sampling phase. Once DC offset cancellation is achieved, the audio driver uses a full scale output stage during the operation phase.
摘要翻译：即使没有声音，直流（DC）偏移和音频驱动器也会导致电源的恒定漏电。此外，当音频驱动程序启用时，它可能会导致声音弹出。可以采用缩放的副本输出级，以在采样阶段离线执行直流偏移消除。一旦实现了DC偏移消除，则音频驱动器在操作阶段使用满量程输出级。

6. 发明申请

US20110087346A1 Tuning and DAC Selection of High-Pass Filters for Audio Codecs 有权
标题翻译：调谐和DAC选择音频编解码器的高通滤波器
公开(公告)号：US20110087346A1
公开(公告)日：2011-04-14
申请号：US12578477
申请日：2009-10-13
申请人： Christian Larsen , Lorenzo Crespi , Mouna Elkhatib
发明人： Christian Larsen , Lorenzo Crespi , Mouna Elkhatib
IPC分类号： G06F17/00
CPC分类号： H03G5/005
摘要： An integrated audio codec includes a high-pass filter to prevent damage to personal computer speakers and other components. The audio codec may be compliant with HD audio standards and can operate with generic software drivers. Tuning of the high-pass filter is provided through an external pin-out where either an external capacitor or external resistors provide an ability to tune the high-pass filter. In one implementation, a tuning voltage is digitized into a tuning code used by a digital high-pass filter. In addition, multiplexers can be used to insure only the audio path leading to the speakers is filtered.
摘要翻译：集成音频编解码器包括高通滤波器，以防止损坏个人计算机扬声器和其他组件。音频编解码器可以符合HD音频标准，并且可以与通用软件驱动程序一起操作。通过外部引脚提供高通滤波器的调谐，其中外部电容器或外部电阻器提供调谐高通滤波器的能力。在一个实现中，调谐电压被数字化为由数字高通滤波器使用的调谐码。此外，多路复用器可以用于确保仅通过扬声器的音频路径被过滤。

7. 发明申请

US20100158278A1 Power Management Controller for Drivers 有权
标题翻译：驱动器电源管理控制器
公开(公告)号：US20100158278A1
公开(公告)日：2010-06-24
申请号：US12339635
申请日：2008-12-19
申请人： Christian Larsen , Lorenzo Crespi , Mouna Elkhatib , Mary Xiao-Hua Lu , James Skov
发明人： Christian Larsen , Lorenzo Crespi , Mouna Elkhatib , Mary Xiao-Hua Lu , James Skov
IPC分类号： H03F99/00
CPC分类号： H04R3/00 , H03F1/305 , H03F3/187 , H03F2200/03 , H03F2200/249 , H03F2200/414 , H03G3/348
摘要： A driver controller comprising a state machine for controlling transitions between a plurality of states. An output switch for providing a low impedance path to ground during transition periods. An output stage for decoupling output signal from driver amplifier during the transition periods.
摘要翻译：一种驱动器控制器，包括用于控制多个状态之间的转换的状态机。输出开关，用于在过渡期间提供低阻抗地线路径。用于在过渡期间将输出信号与驱动放大器去耦的输出级。

8. 发明授权

US08526635B2 Grounding switch method and apparatus 有权
标题翻译：接地开关方式及装置
公开(公告)号：US08526635B2
公开(公告)日：2013-09-03
申请号：US12828716
申请日：2010-07-01
申请人： Christian Larsen , Lorenzo Crespi
发明人： Christian Larsen , Lorenzo Crespi
IPC分类号： H04B15/00
CPC分类号： H03K17/161 , H01L27/0281 , H03F1/305 , H03F3/181 , H03F2200/03 , H03F2200/249 , H03F2200/411 , H03F2200/414 , H03F2200/417 , H03G3/348 , H03K17/6871 , H03K2217/0018
摘要： A grounding switch is described which operates properly even in the presence of negative voltages on a signal line. The grounding switch uses isolated field effect transistors that have their substrates tied to different voltages. The isolated field effect transistor has a gate voltage and substrate voltage which can be pulled down to a negative voltage when the signal line has a negative voltage allowing the switch to remain open even with a negative voltage.
摘要翻译：描述了即使在信号线上存在负电压的情况下也能正常工作的接地开关。接地开关使用隔离的场效应晶体管，将其衬底连接到不同的电压。隔离的场效应晶体管具有栅极电压和衬底电压，当信号线具有负电压时，该电压可以被下拉至负电压，从而允许开关即使具有负电压也保持开路。

9. 发明授权

US08212608B2 Apparatus and method for a smooth powerup of a reference signal 有权
标题翻译：用于参考信号平滑加电的装置和方法
公开(公告)号：US08212608B2
公开(公告)日：2012-07-03
申请号：US12860791
申请日：2010-08-20
申请人： Christian Larsen , Gomathi Komanduru , Lorenzo Crespi
发明人： Christian Larsen , Gomathi Komanduru , Lorenzo Crespi
IPC分类号： G05F1/10 , G05F3/02
CPC分类号： H03F1/305 , H03F3/181 , H03F2200/03 , H03K17/223 , H03K17/28
摘要： A circuit for providing a reference voltage can be widely used in audio applications. However, at startup an abrupt start in the reference signal can cause undesirable audible artifacts. A circuit employing feedback of a reference voltage to control the charging of a capacitor which provides the reference voltage can be used to provide a smooth startup to the reference voltage. The circuit contains a differential pair for steering a fixed current source from one path to another as the reference voltage increases. The steered current can then be mirrored into one or more current mirrors where the newly mirrored current can be squeezed to zero when the difference between a desired reference voltage and the reference voltage approaches zero. This newly mirrored current can be used to charge a capacitor which is used to provide the reference voltage.
摘要翻译：用于提供参考电压的电路可以广泛地用于音频应用中。然而，在启动时，参考信号中的突然启动可能导致不希望的可听见的伪影。采用参考电压的反馈来控制提供参考电压的电容器的充电的电路可用于提供对参考电压的平滑启动。该电路包含用于在参考电压增加时将固定电流源从一个路径转向另一个路径的差分对。转向电流然后可以被镜像到一个或多个电流镜中，当期望的参考电压和参考电压之间的差接近零时，新镜像电流可以被压缩到零。这个新镜像电流可以用于对用于提供参考电压的电容器进行充电。

10. 发明申请

US20110156793A1 SYSTEMS AND METHODS FOR DRIVING HIGH POWER STATES USING LOWER VOLTAGE PROCESSES 有权
标题翻译：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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