摘要
分析了micro GC的功能需求,在理论计算结果指导的基础上,从选用低功耗、低噪声的24 bΔ-Σ模数转换器ADS1255入手,设计了低功耗、低噪声的高共模电压容限全差分放大电路及其他应用外围电路,并对新设计的数据采集电路的热分布和系统性能进行了理论计算和实际测量.结果表明:新设计低功耗数据采集电路的消耗功耗降低了3.7 W,屏蔽盒内环境温度降低了11.7℃,所有重要芯片全部在其额定工作温度范围内,并且全部具有10℃以上的温度裕量,同时数据采集电路获得较低的噪声性能,ASTM值为1.24μV,RMS值为0.85μV,可以满足micro GC的功能需求.
Based on the result of theoretical calculating,ADS1255,a 24-bit delta-sigma ADC is selected as the core component for its lowest noise,low power.A new low power data acquisition circuit is designed with ADS1255 and some other peripheral circuit.The testing result shows that the total power dissipation decreases 3.7 watts and the ambient temperature in the shape decrease 11.7 ℃.All components are all working in the range of their max working temperature and their temperature margin is over 10 ℃.Furthermore,the noise value of new front circuit is also as low as 1.24 μV（ASTM） and 0.85 μV（RMS）.The new data acquisition circuit is low power,litter size and low price and can match the need of micro GC.
出处
《武汉理工大学学报（交通科学与工程版）》
2010年第6期1220-1223,共4页
Journal of Wuhan University of Technology（Transportation Science & Engineering）
基金
国家博士后科学基金项目资助(批准号:20090460750)
