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浙江大学学报(工学版)
J4  2011, Vol. 45 Issue (9): 1571-1575    DOI: 10.3785/j.issn.1008-973X.2011.09.010
计算机技术﹑电信技术     
多比特量化的音频DAC中模拟电路的设计
韩雁1 , 廖璐1 , 黄小伟2 , 张昊1 , 王昊1
1. 浙江大学 信息电子与工程学系，浙江 杭州 310027；2. 杭州电子科技大学 CAD研究所,浙江 杭州 310018
Design of analog circuits in multi-bit quantized audio DAC
HAN Yan1, LIAO Lu1, HUANG Xiao-wei2, ZHANG Hao1, WANG Hao1
1. Department of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China;
2. Institute of Microelectronic CAD, Hangzhou Dianzi University, Hangzhou 310018, China
 全文: PDF 
摘要：

设计了一个高精度、低功耗音频ΣΔ数模转换器（DAC）中的模拟部分电路.该DAC采用4 bit量化,不仅增强了调制器的稳定性,减小了功耗和占用面积,而且降低了系统对后端低通滤波器的要求.讨论了电路各模块的实现方法,并详述了开关电容、带隙基准源等产生非线性的关键模块的设计技术.基于SMIC 0.18 μm混合信号CMOS工艺进行了流片验证,测试结果表明：芯片最大信噪失真比达89 dB,动态范围为96 dB,总功耗为19.1 mW,其中不含缓冲器的功耗仅9.1 mW,样片良率为90%,实现了高精度、低功耗的性能.
关键词： 音频数模转换器;  多比特量化;  开关电容;  缓冲器    
Abstract:

An analog circuit with high resolution and low power in a sigma-delta （Σ-Δ） digital-to-analog converter (DAC) was designed . By adopting 4-bit quantized technique，this DAC not only enhances the stability of the modulator, reduces the power consumption and the occupied area, but also reduces the system requirements for the back-end low-pass filter. Realizing methods of different modules were given, besides, design techniques in crucial modules that generated nonlinearity, such as switched-capacitors and bandgap reference, were discussed . This design was fabricated in SMIC 0.18 μm mixedsignal CMOS process and verified. The measured results showed that the chip had a peak SNDR of 89 dB and a 96 dB dynamic range (DR), and consumed a total power of 19.1 mW, and this value droped to 9.1 mW without buffers. Moreover, the prototype yield was 90%, achieving high precision and low power dissipation.
Key words: audio DAC    multi-bit quantization    switched-capacitor    buffer
出版日期: 2011-10-08
:  TN 432  
通讯作者: 黄小伟,男,博士,讲师.     E-mail: huangxw@hdu.edu.cn
作者简介: 韩雁(1959-),女 ,教授,博导,主要研究高压大功率IC技术、高精度数模混合IC和微纳米IC ESD防护技术. E-mail:hany@zju.edu.cn
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引用本文:

韩雁 , 廖璐 , 黄小伟 , 张昊 , 王昊. 多比特量化的音频DAC中模拟电路的设计[J]. J4, 2011, 45(9): 1571-1575.

HAN Yan, LIAO Lu, HUANG Xiao-wei, ZHANG Hao, WANG Hao. Design of analog circuits in multi-bit quantized audio DAC. J4, 2011, 45(9): 1571-1575.

链接本文:

http://www.zjujournals.com/xueshu/eng/CN/10.3785/j.issn.1008-973X.2011.09.010    或    http://www.zjujournals.com/xueshu/eng/CN/Y2011/V45/I9/1571

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