公开(公告)号：US20240088844A1

公开(公告)日：2024-03-14

申请号：US18243754

申请日：2023-09-08

Applicant: STMicroelectronics S.r.l.

Inventor： Edoardo BOTTI ,  Francesco STILGENBAUER ,  Piero MALCOVATI ,  Edoardo BONIZZONI ,  Matteo DE FERRARI

IPC: H03F3/217 ,  H03F1/02 ,  H03M1/82 ,  H03M3/00

CPC classification number: H03F3/2175 ,  H03F1/0255 ,  H03M1/822 ,  H03M3/424 ,  H03F2200/03

Abstract: Signal processing is applied to a digital audio input signal to provide an analog audio output signal using a switching converter circuit driven by a pulse-width-modulated (PWM) signal. The analog audio output signal is sensed to provide an analog feedback signal. The signal processing that is applied includes: converting the digital audio input signal to producing an analog replica; producing an analog error signal indicative of a difference between the analog replica of the digital input signal and the analog feedback signal; converting the analog error signal to produce a digital error signal; digitally filtering the digital error signal to produce a filtered digital error signal; and generating the PWM signal from the filtered digital error signal.