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    • 25. 发明授权
    • Edge correction to mitigate total harmonic distortion in class D amplifier
    • 边缘校正,以减轻D类放大器的总谐波失真
    • US09467097B2
    • 2016-10-11
    • US14324886
    • 2014-07-07
    • TEXAS INSTRUMENTS INCORPORATED
    • Cetin Kaya
    • H03F3/38H03F3/217H03F1/32
    • H03F1/32H03F1/3205H03F3/2173H03F2200/351
    • A circuit includes an amplifier output stage that includes a high switch and a low switch that generates a pulse width modulated (PWM) output signal to provide a load current to a load in response to a PWM input signal. The circuit includes a high gate drive that drives the high switch with a PWM high drive signal derived from the PWM input signal. This includes a low gate drive that drives the low switch with a PWM low drive signal derived from the PWM input signal. The circuit includes an edge corrector that adjusts at least one of a leading edge and a trailing edge of the PWM input signal to compensate for response time differences with respect to a direction of the load current to the load.
    • 电路包括放大器输出级,其包括高开关和低开关,其产生脉宽调制(PWM)输出信号,以响应于PWM输入信号向负载提供负载电流。 该电路包括一个高栅极驱动器,用PWM驱动信号驱动高开关,PWM信号来自PWM输入信号。 这包括一个低栅极驱动器,通过从PWM输入信号得到的PWM低驱动信号驱动低开关。 电路包括边缘校正器,其调整PWM输入信号的前沿和后沿中的至少一个,以补偿相对于负载的负载电流的方向的响应时间差。
    • 28. 发明授权
    • Symbol-level repetition coding in power line communications
    • 电力线通信中的符号级重复编码
    • US08923416B2
    • 2014-12-30
    • US13267300
    • 2011-10-06
    • Il Han KimBadri N. VaradarajanAnand G. Dabak
    • Il Han KimBadri N. VaradarajanAnand G. Dabak
    • H04B3/00H03H7/30H04W4/00H04B3/54H04L1/08H04L1/00
    • H04L1/08H04B3/54H04B3/546H04B2203/5408H04B2203/5425H04B2203/5433H04B2203/5466H04L1/0059H04L1/0065
    • Systems and methods for implementing symbol-level repetition coding in power line communications (PLC) are described. In some embodiments, these systems and methods may provide reliable communication in severe channel environments of PLC networks, at least in part, by changing the forward error correction (FEC) used by various devices operating within current PLC systems. For example, a method may include receiving a PLC signal and applying convolutional encoding to the received signal, the convolutional encoding producing an encoded signal. The method may also include performing a subcarrier modulation operation upon the encoded signal, the subcarrier modulation operation producing a modulated signal. The method may further include applying symbol-level repetition coding to the modulated signal, the symbol-level repetition coding producing a repetitious signal. In some cases, one or more distinct repetition patterns may be applied to different symbols or portions thereof. The repetitious signal may then be transmitted over a power line.
    • 描述了在电力线通信(PLC)中实现符号级重复编码的系统和方法。 在一些实施例中,这些系统和方法可以至少部分地通过改变在当前PLC系统中操作的各种设备使用的前向纠错(FEC)来在PLC网络的严酷信道环境中提供可靠的通信。 例如,一种方法可以包括接收PLC信号并对接收到的信号应用卷积编码,卷积编码产生编码信号。 该方法还可以包括对编码信号执行子载波调制操作,产生调制信号的子载波调制操作。 该方法还可以包括对调制信号应用符号级重复编码,产生符号级重复编码产生重复信号。 在一些情况下,可以将一个或多个不同的重复图案应用于不同的符号或其部分。 然后可以通过电力线传输重复信号。