一种适用于信号检测的低失真低功耗Σ-Δ A/D转换器  

Design of Low-Distortion and Low-Power Σ-Δ A/D Converter for Signal Detection

作　　者：范军[1] 蒋见花[1] 李海龙[1] 

机构地区：[1]中国科学院微电子研究所,北京100029

出　　处：《微电子学》2011年第4期488-492,497,共6页Microelectronics

基　　金：中国科学院知识创新工程科技创新重要方向项目(Y0YF052001);中国科学院微电子研究所所长基金项目(08SB012001)

摘　　要：采用TSMC 0.18μm混合信号1P6M CMOS工艺,实现了一种适用于传感器信号检测的低失真低功耗Σ-Δ模数转换器(ADC)。该ADC的调制器采用前馈结构和128倍过采样率,实现了12.8 MHz的数据流输出;数字滤波器通带纹波限定在±0.001 dB,阻-带80 dB的有效衰减。ADC工作于1.8 V电源电压,整体功耗为3.6 mW(2 mA),版图尺寸为1.9 mm×1.45 mm。后仿真结果显示,该ADC在50 kHz信号带宽内达到84 dB的信噪失真比、94.58 dB的动态范围和-92.6 dB的总谐波失真。Based on TSMC＇s 0.18 μm 1P6M CMOS process,a low-distortion and low-power Σ-Δ A/D converter for signal detection of sensor was implemented.The modulator of ADC adopts feed forward structure and 12.8 MHz data-stream output by OSR of 128,and the digital filter featured ripples within ±0.001 dB in pass band and-80 dB attenuation in stop band.The ADC consumed a power of 3.6 mW（2 mA） at 1.8 V supply,and the layout area was 1.9 mm ×1.45 mm.Post-simulation showed that the ADC had an SNDR of 84 dB,an SFDR of 94.58 dB and a THD of-92.6 dB within 50 kHz bandwidth.

关 键 词：Σ-Δ调制器 A/D转换器 微弱信号检测 开关电容积分器 

分 类 号：TN792[电子电信—电路与系统]