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1. 发明授权

US09319768B2 Multi-standard headset support with integrated ground switching 有权
标题翻译：多标准耳机支持集成接地切换
公开(公告)号：US09319768B2
公开(公告)日：2016-04-19
申请号：US13312897
申请日：2011-12-06
申请人： Christian Larsen , Lorenzo Crespi , Brian W. Friend
发明人： Christian Larsen , Lorenzo Crespi , Brian W. Friend
IPC分类号： H04R5/033 , H04R1/10 , H01R24/58
CPC分类号： H04R1/1041 , H01R24/58 , H04R2201/107 , H04R2420/05 , H04R2420/09
摘要： A system for detecting a jack configuration comprising a first plurality of switches configured to couple a first headphone jack position to ground. A second plurality of switches configured to couple a second headphone jack position to ground. A microphone bias circuit for applying a microphone bias signal to the second headphone jack position when the first headphone jack position is coupled to ground, and for applying the microphone bias signal to the first headphone jack position when the second headphone jack position is coupled to ground.
摘要翻译：一种用于检测插座结构的系统，包括配置成将第一耳机插孔位置耦合到地的第一多个开关。配置成将第二耳机插孔位置耦合到地的第二多个开关。麦克风偏置电路，用于当第一耳机插孔位置耦合到地面时将麦克风偏置信号施加到第二耳机插孔位置，并且当第二耳机插孔位置耦合到地面时将麦克风偏置信号施加到第一耳机插孔位置。

2. 发明申请

US20130142350A1 MULTI-STANDARD HEADSET SUPPORT WITH INTEGRATED GROUND SWITCHING 有权
标题翻译：多标准耳机支持与集成式接地切换
公开(公告)号：US20130142350A1
公开(公告)日：2013-06-06
申请号：US13312897
申请日：2011-12-06
申请人： Christian Larsen , Lorenzo Crespi , Brian W. Friend
发明人： Christian Larsen , Lorenzo Crespi , Brian W. Friend
IPC分类号： H04R1/10
CPC分类号： H04R1/1041 , H01R24/58 , H04R2201/107 , H04R2420/05 , H04R2420/09
摘要： A system for detecting a jack configuration comprising a first plurality of switches configured to couple a first headphone jack position to ground. A second plurality of switches configured to couple a second headphone jack position to ground. A microphone bias circuit for applying a microphone bias signal to the second headphone jack position when the first headphone jack position is coupled to ground, and for applying the microphone bias signal to the first headphone jack position when the second headphone jack position is coupled to ground.
摘要翻译：一种用于检测插座结构的系统，包括配置成将第一耳机插孔位置耦合到地的第一多个开关。配置成将第二耳机插孔位置耦合到地的第二多个开关。麦克风偏置电路，用于当第一耳机插孔位置耦合到地面时将麦克风偏置信号施加到第二耳机插孔位置，并且当第二耳机插孔位置耦合到地面时将麦克风偏置信号施加到第一耳机插孔位置。

3. 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。

4. 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。

5. 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。

6. 发明授权

US08587287B2 High-bandwidth linear current mirror 有权
标题翻译：高带宽线性电流镜
公开(公告)号：US08587287B2
公开(公告)日：2013-11-19
申请号：US12828640
申请日：2010-07-01
申请人： Christian Larsen , Lorenzo Crespi
发明人： Christian Larsen , Lorenzo Crespi
IPC分类号： G05F3/16
CPC分类号： G05F3/262
摘要： High linearity is essential in audio circuitry. As sampling rates for audio applications are needed, high speed and high linearity are needed in analog and mixed signal portions of audio circuitry such as in current mirrors. A current mirror employs two current paths in an output. The first current path is driven by a fast acting transistor through a resistor. The second current path is driven by a differential amplifier coupled to another transistor through another resistor. The second current path is used to maintain linearity by causing the voltage across both transistors to be the same.
摘要翻译：高线性度在音频电路中至关重要。由于需要音频应用的采样率，所以在诸如电流镜之类的音频电路的模拟和混合信号部分中需要高速和高线性度。电流镜在输出中使用两个电流路径。第一电流路径由快速作用的晶体管通过电阻驱动。第二电流路径由通过另一个电阻耦合到另一个晶体管的差分放大器驱动。第二电流路径用于通过使两个晶体管两端的电压相同来保持线性度。

7. 发明申请

US20130113541A1 LOW POWER LEVEL SHIFTER WITH OUTPUT SWING CONTROL 有权
标题翻译：具有输出开关控制的低功率电平变压器
公开(公告)号：US20130113541A1
公开(公告)日：2013-05-09
申请号：US13289926
申请日：2011-11-04
申请人： Lorenzo Crespi , Christian Larsen , Lakshmi P. Murukutla , Ketan B. Patel
发明人： Lorenzo Crespi , Christian Larsen , Lakshmi P. Murukutla , Ketan B. Patel
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。

8. 发明授权

US08410839B2 Systems and methods for driving high power states using lower voltage processes 有权
标题翻译：使用较低电压工艺驱动高功率状态的系统和方法
公开(公告)号：US08410839B2
公开(公告)日：2013-04-02
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。

9. 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。

10. 发明申请

US20110123049A1 Systems and Methods for Offset Cancellation Method for DC-Coupled Audio Drivers 有权
标题翻译：直流耦合音频驱动器偏移消除方法的系统和方法
公开(公告)号：US20110123049A1
公开(公告)日：2011-05-26
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： H03F99/00 , H03F3/16
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。

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