An 18-bit high performance audio ∑-△D/A converter  

作　　者：张昊 黄小伟 韩雁 张泽松 韩晓霞 王昊 梁国 

机构地区：[1]Institute of Microelectronics and Photoelectronics,Zhejiang University [2]CISD,Institute of Microelectronic CAD [3]Department of Electronic Engineering,City University of Hong Kong

出　　处：《Journal of Semiconductors》2010年第7期79-84,共6页半导体学报（英文版）

摘　　要：A multi-bit quantized high performance sigma-delta（Σ-Δ） audio DAC is presented.Compared to its singlebit counterpart,the multi-bit quantization offers many advantages,such as simplerΣ-Δmodulator circuit,lower clock frequency and smaller spurious tones.With the data weighted average（DWA） mismatch shaping algorithm,element mismatch errors induced by multi-bit quantization can be pushed out of the signal band,hence the noise floor inside the signal band is greatly lowered.To cope with the crosstalk between digital and analog circuits,every analog component is surrounded by a guard ring,which is an innovative attempt.The 18-bit DAC with the above techniques,which is implemented in a 0.18μm mixed-signal CMOS process,occupies a core area of 1.86 mm^2.The measured dynamic range（DR） and peak SNDR are 96 dB and 88 dB,respectively.A multi-bit quantized high performance sigma-delta（Σ-Δ） audio DAC is presented.Compared to its singlebit counterpart,the multi-bit quantization offers many advantages,such as simplerΣ-Δmodulator circuit,lower clock frequency and smaller spurious tones.With the data weighted average（DWA） mismatch shaping algorithm,element mismatch errors induced by multi-bit quantization can be pushed out of the signal band,hence the noise floor inside the signal band is greatly lowered.To cope with the crosstalk between digital and analog circuits,every analog component is surrounded by a guard ring,which is an innovative attempt.The 18-bit DAC with the above techniques,which is implemented in a 0.18μm mixed-signal CMOS process,occupies a core area of 1.86 mm^2.The measured dynamic range（DR） and peak SNDR are 96 dB and 88 dB,respectively.

关 键 词：digital-to-analog converter Σ-Δmodulator multi-bit quantization SWITCHED-CAPACITOR 

分 类 号：TN792[电子电信—电路与系统]