随着汽车工业和汽车多媒体技术的发展,汽车收音机调谐器技术也趋向于单片集成化、全球应用化、自动调试化等特点发展。本文结合飞利浦公司最新开发设计的CREST IC TEF6860HL型高性能汽车收音机处理芯片,阐述了汽车收音机调谐器的最新技...随着汽车工业和汽车多媒体技术的发展,汽车收音机调谐器技术也趋向于单片集成化、全球应用化、自动调试化等特点发展。本文结合飞利浦公司最新开发设计的CREST IC TEF6860HL型高性能汽车收音机处理芯片,阐述了汽车收音机调谐器的最新技术发展方向和原理应用。展开更多
基于0.25μm 5 V/12 V 1P3M高压BCD（BJT/CMOS/DMOS）工艺设计实现了一款独立式低压光电式烟雾探测器专用集成电路（ASIC）。分析了系统原理,重点设计了烟雾探测和DC-DC升压电路。其中,烟雾探测电路通过对光电流信号依次进行积分、6 bit...基于0.25μm 5 V/12 V 1P3M高压BCD（BJT/CMOS/DMOS）工艺设计实现了一款独立式低压光电式烟雾探测器专用集成电路（ASIC）。分析了系统原理,重点设计了烟雾探测和DC-DC升压电路。其中,烟雾探测电路通过对光电流信号依次进行积分、6 bit ADC量化以及与限制值比较等处理来判断是否有烟雾,电路内部嵌入了多次可擦写（MTP）存储单元用于限制值的数字编程,提高了探测精度和终端产品的生产效率。DC-DC升压电路可将1.8~5.5 V的输入电压转换为3.3~12 V的输出电压,用于驱动蜂鸣器和LED等负载。测试结果显示,芯片的功能和性能指标达到设计要求,待机静态电流仅约0.6μA,对低至0.9 n A的输入光电流信号可进行有效探测。展开更多
Depending on the numerical test approach on a computer, the relationships among relevant parameters, eg branch number, node number, mesh number, computation accuracy, preliminary value of airflow rate, iteration numbe...Depending on the numerical test approach on a computer, the relationships among relevant parameters, eg branch number, node number, mesh number, computation accuracy, preliminary value of airflow rate, iteration number, computation time and convergence in a mine ventilation network analysis, were investigated based on 5 mine ventilation systems. The results show that a higher computation accuracy greatly influences the iteration number. When the accuracy reaches 10-6m3·s-1 for solving a complicated mine ventilation network, the running time is too long though a high-speed computer is used. The preliminary value of airflow rate in the range of 1100m3·s-1 has little effects the iteration number. The structure of network also has some effect on the iteration number.展开更多
文摘基于0.25μm 5 V/12 V 1P3M高压BCD（BJT/CMOS/DMOS）工艺设计实现了一款独立式低压光电式烟雾探测器专用集成电路（ASIC）。分析了系统原理,重点设计了烟雾探测和DC-DC升压电路。其中,烟雾探测电路通过对光电流信号依次进行积分、6 bit ADC量化以及与限制值比较等处理来判断是否有烟雾,电路内部嵌入了多次可擦写（MTP）存储单元用于限制值的数字编程,提高了探测精度和终端产品的生产效率。DC-DC升压电路可将1.8~5.5 V的输入电压转换为3.3~12 V的输出电压,用于驱动蜂鸣器和LED等负载。测试结果显示,芯片的功能和性能指标达到设计要求,待机静态电流仅约0.6μA,对低至0.9 n A的输入光电流信号可进行有效探测。
基金Project (50474050) supported by the National Natural Science Foundation of China
文摘Depending on the numerical test approach on a computer, the relationships among relevant parameters, eg branch number, node number, mesh number, computation accuracy, preliminary value of airflow rate, iteration number, computation time and convergence in a mine ventilation network analysis, were investigated based on 5 mine ventilation systems. The results show that a higher computation accuracy greatly influences the iteration number. When the accuracy reaches 10-6m3·s-1 for solving a complicated mine ventilation network, the running time is too long though a high-speed computer is used. The preliminary value of airflow rate in the range of 1100m3·s-1 has little effects the iteration number. The structure of network also has some effect on the iteration number.
