公开(公告)号：US20130241647A1

公开(公告)日：2013-09-19

申请号：US13683637

申请日：2012-11-21

Applicant: ESS TECHNOLOGY, INC.

Inventor： Dustin Dale Forman ,  Trevor Blake Lynch-Staunton ,  Montana T.C. Reid

IPC: H03F3/217

CPC classification number: H03F3/217 ,  H03F1/3205 ,  H03F3/2171 ,  H03F3/2175

Abstract: The present application describes an apparatus and method for reducing distortion in a class-D amplifier. The power output section of the amplifier is driven by an adjusted PWM signal, rather than by a PWM signal created directly from the input analog signal. A reference output, designed to closely track the input analog signal, is compared to the amplifier output. The resulting difference is an error signal which is inverted and summed with a second analog signal corresponding to the directly created PWM signal and changes the timing of the voltage transitions of the second analog signal. The changed voltage transitions are used to create the adjusted PWM signal. The inversion of the error signal causes negative feedback which results in the adjustment of the PWM signal being in a direction which reduces the error signal and thus the distortion of the amplifier.

Abstract translation: 本申请描述了用于减少D类放大器中的失真的装置和方法。 放大器的功率输出部分由调整后的PWM信号驱动，而不是直接由输入模拟信号产生的PWM信号驱动。 与输出模拟信号紧密跟踪的参考输出与放大器输出进行比较。 所产生的差异是将与直接产生的PWM信号对应的第二模拟信号反相并相加并且改变第二模拟信号的电压转换的定时的误差信号。 改变的电压转换用于创建调整后的PWM信号。 误差信号的反转引起负反馈，导致PWM信号的调整在减小误差信号的方向上，从而导致放大器的失真。