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    Methods to improve bluetooth low energy performance
    1.
    发明授权
    Methods to improve bluetooth low energy performance 有权
    提高蓝牙低能耗性能的方法

    公开(公告)号：US08913748B2

    公开(公告)日：2014-12-16

    申请号：US13541563

    申请日：2012-07-03

    申请人： Jin-Meng Ho ,  Ariton E. Xhafa ,  Gangadhar Burra

    发明人： Jin-Meng Ho ,  Ariton E. Xhafa ,  Gangadhar Burra

    IPC分类号： H04W80/00 ,  H04L29/06 ,  H04L9/06 ,  H04W52/02 ,  H04W28/06

    CPC分类号： H04L9/0637 ,  H04L2209/80 ,  H04W12/02 ,  H04W28/06 ,  H04W52/0229 ,  H04W80/00 ,  H04W84/18 ,  Y02D70/144

    摘要： An expanded sequence number is added to PDUs in a Bluetooth® low energy system. The expanded sequence number provides more accurate identification of the PDUs and allows the system to avoid delaying transmission of PDUs while retransmitting other PDUs. A PDU security sequence number may also be added to the PDUs. The security sequence number is used to create a unique nonce for use in encrypting or decrypting and authenticating the PDU. Using the security sequence number, a failed connection can be reestablished between two devices without the need of generating an encryption key. The security sequence number allows the devices to perform encryption or decryption and authentication using an existing key and a nonce generated from the security sequence number.

    摘要翻译： 在蓝牙®低能量系统中将扩展的序列号添加到PDU中。 扩展的序列号提供了PDU的更准确的识别，并允许系统避免延迟PDU的传输，同时重传其他PDU。 还可以将PDU安全序列号添加到PDU中。 安全序列号用于创建用于加密或解密和认证PDU的唯一的随机数。 使用安全序列号，可以在两台设备之间重建故障连接，而无需生成加密密钥。 安全序列号允许设备使用现有密钥和从安全序列号生成的随机数执行加密或解密和认证。

    Methods to Improve Bluetooth Low Energy Performance
    2.
    发明申请
    Methods to Improve Bluetooth Low Energy Performance 有权
    提高蓝牙低能耗性能的方法

    公开(公告)号：US20130010960A1

    公开(公告)日：2013-01-10

    申请号：US13541563

    申请日：2012-07-03

    申请人： Jin-Meng Ho ,  Ariton E. Xhafa ,  Gangadhar Burra

    发明人： Jin-Meng Ho ,  Ariton E. Xhafa ,  Gangadhar Burra

    IPC分类号： H04W52/02 ,  H04L9/00

    CPC分类号： H04L9/0637 ,  H04L2209/80 ,  H04W12/02 ,  H04W28/06 ,  H04W52/0229 ,  H04W80/00 ,  H04W84/18 ,  Y02D70/144

    摘要： An expanded sequence number is added to PDUs in a Bluetooth® low energy system. The expanded sequence number provides more accurate identification of the PDUs and allows the system to avoid delaying transmission of PDUs while retransmitting other PDUs. A PDU security sequence number may also be added to the PDUs. The security sequence number is used to create a unique nonce for use in encrypting or decrypting and authenticating the PDU. Using the security sequence number, a failed connection can be reestablished between two devices without the need of generating an encryption key. The security sequence number allows the devices to perform encryption or decryption and authentication using an existing key and a nonce generated from the security sequence number.

    摘要翻译： 在蓝牙®低能量系统中将扩展的序列号添加到PDU中。 扩展的序列号提供了PDU的更准确的识别，并允许系统避免延迟PDU的传输，同时重传其他PDU。 还可以将PDU安全序列号添加到PDU中。 安全序列号用于创建用于加密或解密和认证PDU的唯一的随机数。 使用安全序列号，可以在两台设备之间重建故障连接，而无需生成加密密钥。 安全序列号允许设备使用现有密钥和从安全序列号生成的随机数执行加密或解密和认证。

    Turbo modes for BAN-based communications
    3.
    发明授权
    Turbo modes for BAN-based communications 有权
    用于基于BAN的通信的Turbo模式

    公开(公告)号：US08830941B2

    公开(公告)日：2014-09-09

    申请号：US13614464

    申请日：2012-09-13

    申请人： Jin-Meng Ho ,  Gangadhar Burra

    发明人： Jin-Meng Ho ,  Gangadhar Burra

    IPC分类号： H04W4/00 ,  H04J3/24 ,  H04W28/06

    CPC分类号： H04W28/06

    摘要： A first device is adapted to communicate with a second device using a protocol standard. The devices exchange security and connection setup frames using a preamble format and a header format defined in the protocol standard. The connection setup frames specify a modified protocol using a truncated preamble, a shortened header, or both. The devices configure their transceivers to transmit and receive frames formatted based on the modified protocol.

    摘要翻译： 第一设备适于使用协议标准与第二设备进行通信。 设备使用协议标准中定义的前导码格式和报头格式交换安全和连接建立帧。 连接设置帧使用截断的前导码，缩短的头部或两者来指定修改的协议。 这些设备配置其收发器来发送和接收基于修改的协议格式化的帧。

    Turbo Modes for BAN-based Communications
    4.
    发明申请
    Turbo Modes for BAN-based Communications 有权
    基于BAN的通信的Turbo模式

    公开(公告)号：US20130064235A1

    公开(公告)日：2013-03-14

    申请号：US13614464

    申请日：2012-09-13

    申请人： Gangadhar Burra ,  Jin-Meng Ho

    发明人： Gangadhar Burra ,  Jin-Meng Ho

    IPC分类号： H04W40/00 ,  H04W72/04

    CPC分类号： H04W28/06

    摘要： A first device is adapted to communicate with a second device using a protocol standard. The devices exchange security and connection setup frames using a preamble format and a header format defined in the protocol standard. The connection setup frames specify a modified protocol using a truncated preamble, a shortened header, or both. The devices configure their transceivers to transmit and receive frames formatted based on the modified protocol.

    摘要翻译： 第一设备适于使用协议标准与第二设备进行通信。 设备使用协议标准中定义的前导码格式和报头格式交换安全和连接建立帧。 连接设置帧使用截断的前导码，缩短的头部或两者来指定修改的协议。 这些设备配置其收发器来发送和接收基于修改的协议格式化的帧。

    COMMON-MODE TECHNIQUE FOR A DIGITAL I/P CLASS D LOOP
    6.
    发明申请
    COMMON-MODE TECHNIQUE FOR A DIGITAL I/P CLASS D LOOP 有权
    用于数字I / P类D循环的通用模式技术

    公开(公告)号：US20070279126A1

    公开(公告)日：2007-12-06

    申请号：US11422509

    申请日：2006-06-06

    申请人： Jagadeesh Krishnan ,  Srinath M. Ramaswamy ,  Gangadhar Burra

    发明人： Jagadeesh Krishnan ,  Srinath M. Ramaswamy ,  Gangadhar Burra

    IPC分类号： H03F3/38

    CPC分类号： H03F3/2173 ,  H03F1/34 ,  H03F2200/351

    摘要： A closed loop amplifier adapted to be directly connected to a battery having a battery voltage for powering the amplifier. The amplifier includes an amplifier stage having a node for receiving a control voltage for controlling a common mode voltage of the stage, a digital voltage indicator for generating a digital value corresponding to the battery voltage, and a common mode voltage supply providing the control voltage corresponding to the digital value.In a preferred embodiment, a Class-D amplifier is powered by a power supply providing power by way of a power supply voltage node and a ground node, the amplifier having improved common-mode voltage control. A first integrator stage receives an input signal and provides an output signal, the integrator stage having a first common-mode reference voltage applied thereto for control of the common-mode voltage of the integrator stage. A second integrator stage receives an input signal and provides an output signal, the integrator stage having a second common-mode reference voltage applied thereto for control of the common-mode voltage of the integrator stage. A comparator stage receives the output of the first integrator stage and the output of the second integrator stage and provides an output signal corresponding to the difference between them. An output stage provides an output of the amplifier. A digital voltage indicator generates a digital value corresponding to the voltage at the power supply voltage node, while a common-mode voltage supply provides the first common-mode reference voltage corresponding to the digital value.

    摘要翻译： 适于直接连接到具有用于为放大器供电的电池电压的电池的闭环放大器。 放大器包括放大器级，具有用于接收用于控制级的共模电压的控制电压的节点，用于产生对应于电池电压的数字值的数字电压指示器，以及提供相应的控制电压的共模电压电源 到数字值。 在优选实施例中，D类放大器由通过电源电压节点和接地节点提供功率的电源供电，该放大器具有改进的共模电压控制。 第一积分器级接收输入信号并提供输出信号，积分器级具有施加到其上的第一共模参考电压以用于控制积分器级的共模电压。 第二积分器级接收输入信号并提供输出信号，积分器级具有施加到其上的第二共模参考电压，用于控制积分器级的共模电压。 比较器级接收第一积分器级的输出和第二积分器级的输出，并提供对应于它们之间的差的输出信号。 输出级提供放大器的输出。 数字电压指示器产生对应于电源电压节点处的电压的数字值，而共模电压电源提供对应于数字值的第一共模参考电压。

    Class-D amplifier system
    7.
    发明申请
    Class-D amplifier system 有权
    D类放大器系统

    公开(公告)号：US20070024365A1

    公开(公告)日：2007-02-01

    申请号：US11193867

    申请日：2005-07-29

    申请人： Srinath Ramaswamy ,  Jagadeesh Krishnan ,  Gangadhar Burra

    发明人： Srinath Ramaswamy ,  Jagadeesh Krishnan ,  Gangadhar Burra

    IPC分类号： H03F3/217

    CPC分类号： H03F3/217 ,  H03F1/30 ,  H03F1/34 ,  H03F3/2173 ,  H03F2200/261 ,  H03F2200/331 ,  H03F2200/351

    摘要： A Class-D amplifier system may include an input stage that includes an Nth order filter, where N>1. The input stage filters an input signal to provide a filtered output signal, an input of the input stage being configured to receive the input signal as a digital pulse-width-modulated (PWM) signal. A comparator provides a quantized output signal based on the filtered output signal. An output stage is connected between a first voltage rail and a second voltage rail. The output stage provides a switching output signal at an output that varies between the first voltage rail and the second voltage rail based on the quantized output signal. A feedback path connects the output of the output stage with the input of the input stage, such that the Nth order filter compensates for variations in at least one of the first voltage rail and the second voltage rail.

    摘要翻译： D类放大器系统可以包括输入级，该输入级包括N≥1级的N次级滤波器。 输入级对输入信号进行滤波以提供经滤波的输出信号，输入级的输入被配置为接收输入信号作为数字脉宽调制（PWM）信号。 比较器基于滤波的输出信号提供量化的输出信号。 输出级连接在第一电压轨和第二电压轨之间。 输出级基于量化的输出信号在输出端提供在第一电压轨和第二电压轨之间变化的开关输出信号。 反馈路径将输出级的输出与输入级的输入相连，使得第N级阶滤波器补偿第一电压轨和第二电压轨中的至少一个的变化。

    Systems for pseudo-BD modulation
    8.
    发明申请
    Systems for pseudo-BD modulation 有权
    伪BD调制系统

    公开(公告)号：US20070024361A1

    公开(公告)日：2007-02-01

    申请号：US11193871

    申请日：2005-07-29

    申请人： Jagadeesh Krishnan ,  Srinath Ramaswamy ,  Gangadhar Burra

    发明人： Jagadeesh Krishnan ,  Srinath Ramaswamy ,  Gangadhar Burra

    IPC分类号： H03F3/28

    CPC分类号： H03F3/68 ,  H03F3/2173 ,  H03F2200/165 ,  H03F2200/351 ,  H03F2200/459

    摘要： An amplifier system in accordance with an aspect of the present invention comprises a switching amplifier that drives a load with a pulse-width modulated (PWM) output signal that varies between first and second rails based on a first control input signal, and a common mode supply that provides a switching signal that varies between third and fourth rails to maintain a common mode voltage of the load at a level that is between the first and second rails.

    摘要翻译： 根据本发明的一个方面的放大器系统包括开关放大器，其基于第一控制输入信号和第二控制输入信号在第一和第二轨道之间变化的脉冲宽度调制（PWM）输出信号驱动负载， 电源提供在第三和第四导轨之间变化的开关信号，以将负载的共模电压维持在第一和第二导轨之间的水平。

    Switching amplifiers into and out of circuits with reduced output noise
    9.
    发明授权
    Switching amplifiers into and out of circuits with reduced output noise 失效
    开关放大器进出电路，输出噪声降低

    公开(公告)号：US5764103A

    公开(公告)日：1998-06-09

    申请号：US682129

    申请日：1996-07-17

    申请人： Gangadhar Burra ,  Paul F. Ferguson, Jr.

    发明人： Gangadhar Burra ,  Paul F. Ferguson, Jr.

    IPC分类号： H03F1/30

    CPC分类号： H03F1/303

    摘要： An insubstantial amount of noise results at the output of a circuit when an output of a primary amplifier is disconnected from and reconnected to the circuit in which is operating. The primary amplifier is placed temporarily in a muting configuration. A secondary amplifier permanently in a muting configuration is connected in parallel with the primary amplifier. The output of the primary amplifier then is disconnected from a circuit node to which it is attached. The primary amplifier may then be taken out of its muting configuration. After, for example, configuring the primary amplifier as a comparator and calibrating its dc-offset voltage, the primary amplifier is placed back into a muting configuration. The secondary amplifier then is disconnected from the primary amplifier. The primary amplifier may subsequently be taken out of muting configuration to resume its normal function in the circuit.

    摘要翻译： 当主放大器的输出与正在操作的电路断开并重新连接时，在电路的输出端产生非实质的噪声量。 主放大器临时放置在静音配置中。 永久静音配置的辅助放大器与主放大器并联连接。 然后，主放大器的输出与其所连接的电路节点断开连接。 然后可以将主放大器从其静音配置中取出。 之后，例如，将主放大器配置为比较器并校准其直流偏移电压，则将主放大器放回静音配置。 然后，次级放大器与主放大器断开连接。 随后可以将主放大器从静音配置中取出以恢复其在电路中的正常功能。