JSSC 2023第12期Data Converters180nmDACNeural Network Accelerator

A 1209-dB DR Digital-Input Capacitively Coupled Chopper Class-D Audio Amplifier

一种采用斩波电容反馈网络和电容DAC的数字输入D类音频放大器，实现120.9 dB动态范围。

180nm BCD, 120.9 dB DR, -111.2 dB THD+N, 15/26W@8/4Ω, 90%/86%效率

D类放大器斩波稳定电容DAC动态范围音频功放

▸斩波电容反馈网络消除DAC和反馈电阻噪声

▸实时动态元件匹配(RTDEM)降低DAC失配失真

▸死区消除DAC的码间干扰(ISI)

Abstract

This article presents a digital-input class-D ampli- fier (CDA) achieving high dynamic range (DR) by employing a chopped capacitive feedback network and a capacitive digital-to-analog converter (DAC). Compared with conventional resistive-feedback CDAs driven by resistive or current-steering DACs, the proposed architecture eliminates the noise from the DAC and feedback resistors. Intermodulation between the chopping, pulsewidth modulation (PWM), and DAC sampling frequency is analyzed to avoid neg