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A High-Linearity and Low-EMI Multilevel Class-D Amplifier Huajun Zhang Graduate
本文提出了一种用于汽车应用的高线性度、低EMI的多电平D类音频放大器。
180-nm BCD, 14.4V, 7mA, THD+N -107.8dB/-102dB, 峰值效率91%/87%
D类放大器高线性度低EMI多电平输出汽车应用
▸采用4.2 MHz全差分多电平输出级降低EMI
▸零输入时最小切换活动的调制方案降低空闲功耗
▸三阶反馈环路实现高线性度
Abstract
This article presents a Class-D audio amplifier for
automotive applications. Low electromagnetic interference (EMI)
and, hence, smaller LC filter size are obtained by employing a
fully differential multilevel output stage switching at 4.2 MHz.
A modulation scheme with minimal switching activity at zero
input reduces idle power, which is further assisted by a
gate-charge reuse scheme. It also achieves high linearity due
to the high loop gain realized by a third-order feedback loop
with a bandwidth