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JSSC 2013第8期RF & Wireless110nm CMOS

A Low-EMI 3-W Audio Class-D Ampli fier Compatible With AMFM Radio Pio Balmelli Se

一款兼容AM/FM收音机的低EMI 3W音频D类放大器，采用驱动斜率控制和数字调制技术。
2.7-6.6V, 95dB SNR, 85%效率
D类放大器电磁干扰AM/FM兼容H桥线性化电源抑制比
▸驱动斜率控制降低FM频段EMI
▸数字调制在AM频道形成零陷
▸两种反馈技术线性化H桥并提升电源抑制比
Abstract
A 3-W audio class-D ampli fier compatible with AM/FM radio while requiring minimal external filtering is pre- sented. The ampli fier uses driver slew rate control to reduce electromagnetic interference (EMI) in the FM band and dig- ital modulation to spread the PWM common-mode signal and place a null at the tuned AM channel. Two original feedback techniques are employed to linearize the H-bridge. One cancels signal-dependent pr opagation delays in the H-bridge to improve harmonic distortion and eli