一种用于音频系统单环多比特ΔΣ D/A的设计  

Single-Loop Multi-Bit High Resolution ΔΣ D/A for Audio System

作　　者：井光超[1] 李冬梅[2] 

机构地区：[1]清华大学微电子研究所 [2]清华大学电子工程系,北京100084

出　　处：《半导体技术》2009年第10期1027-1031,共5页Semiconductor Technology

基　　金："十一五"863计划重点项目(2008AA010708)

摘　　要：在1.8V电压下,使用UMC0.18μm混合信号工艺,设计实现了一个用于音频系统的19位20kHz数模转换器(DAC),其中包括了一个单环多比特Δ∑调制器和一个用于平滑效果的开关电容滤波器(SCF);仿真结果表明,在64倍过采样率、5bit信号量化时,DAC能够实现17.22bit的转换精度,模拟电路部分功耗只有6.9mW,考虑到数字部分,功耗和品质因素(FOM)值P/(2×BW×2ENOB)≤3pJ/step;芯片版图面积约为1.4mm×1.6mm。A 19 bit 20 kHz digital to analog DAC was designed in UMC 0.18 μm CMOS technology with 1.8 V power supply. The DAC includes a single-loop multi-bit △∑ modulator and a switched capacitor filter. According to the simulation in spectre-verilog, it can realize 17.22 bit resolutions under 64 times over-sample ratio while in 5-bit quantization. The power used in analog part is only 6. 9 mW, considering the consumption of digital part, FOM value is smaller than 3 pJ/stcp, the whole chip size including PAD is 1.4 mm × 1.6 mm.

关 键 词：DAC Δ∑调制器 开关电容滤波器 FOM 

分 类 号：TN431.1[电子电信—微电子学与固体电子学]