A -117dBc THD (-132dBc HD3) and 126dB DR Audio Decoder with Code-Change-Insensitive RT-DEM Algorithm and Circuit Technique for Relaxing Velocity Saturation Effect of Poly Resistors

📋 论文概要

该论文提出了一种码变化不敏感的实时动态元件匹配（RT-DEM）算法和电路技术，用于音频解码器，解决了码间干扰、多晶电阻非线性引起的三次谐波失真以及交叉失真问题，实现了-117dBc THD（-132dBc HD3）和126dB动态范围。

💡 主要创新点

• 提出码变化不敏感的RT-DEM算法，克服了传统RT-DEM中1-LSB变化对ΣΔ调制器动态范围的限制。
• 采用电路技术同时抑制码间干扰、三次谐波失真和交叉失真，无需复杂数字硬件。

🏷 关键词

📄 原文摘要

inter-symbol interference (ISI) [1,2]; 2) 3rd-order harmonic distortion (HD3) due to the 2nd-order nonlinearity of poly resistors; and 3) Cross-over distortion (COD) arising from limited amplifier inner-loop gain due to high output load capacitance (CL) [3,4]. First, to alleviate the ISI, [1] presents a Real-Time Dynamic-Element-Matching (RT-DEM) algorithm to realize mismatch shaping for DAC cells, achieving 115dB SFDR without complex digital hardware as in [2]. However, the constraint of 1-LSB change with the RT-DEM limits dynamic range (DR) of the Σ∆ modulator. Moreover, a high clock rate of 181MHz causes a high power consumption. Second, with a large signal swing, the total harmonic distortion (THD) of current-to-voltage (I2V) amplifiers is frequently dominated by the

👥 作者与机构

Shon-Hang Wen, Chuan-Hung Hsiao, Shih-Hsiung Chien, Ya-Chi Chen,

Kuan-Hung Chen, Kuan-Dar Chen MediaTek, Hsinchu, Taiwan Three major distortion sources in high-fidelity audio decoders are 1) DAC