设计了一种用于高速流水线ADC的多相时钟产生电路。通过采用一种高灵敏度差分时钟输入结构和时钟接收电路,降低了输入时钟的抖动。该多相时钟产生电路已成功应用于一种12位250MSPS流水线ADC,电路采用0.18μm 1P5M 1.8 V CMOS工艺实现,...设计了一种用于高速流水线ADC的多相时钟产生电路。通过采用一种高灵敏度差分时钟输入结构和时钟接收电路,降低了输入时钟的抖动。该多相时钟产生电路已成功应用于一种12位250MSPS流水线ADC,电路采用0.18μm 1P5M 1.8 V CMOS工艺实现,面积为2.5 mm2。测试结果表明,该ADC在全速采样条件下对20 MHz输入信号的信噪比(SNR)为69.92 d B,无杂散动态范围(SFDR)为81.17 d B,积分非线性误差(INL)为-0.4^+0.65 LSB,微分非线性误差(DNL)为-0.2^+0.15 LSB,功耗为320 m W。展开更多
Based on the analyses for the characteristics of high precise GPS defor-mation monitor,according to the spatial relationship among the satellite, base point and monitoring point a new model and its corresponding algor...Based on the analyses for the characteristics of high precise GPS defor-mation monitor,according to the spatial relationship among the satellite, base point and monitoring point a new model and its corresponding algorithm were presented to solve the monitoring point deformation directly at single epoch. In this method the carrier phases is used as the basic observations, and the initial condition is precise baseline vectors obtained in the first period observations between the base point and monitoring point. This model is called the similar single difference model (SSDM). The main error sources effecting the accuracy of deformations were analyzed briefly, the single epoch algorithm of the receiver clock offset was advanced. The numerical results of test data show that the SSDM and the single epoch algorithm of receiver clock offset advanced are reliable and correct.展开更多
最近拜读了本校唐继权先生编著的《全球定位系统(GPS)测量》教材,受益匪浅。第一,它对本校传统测量教学是一个度的突破、质的转变;第二,为本校同行中有这方面高科技人才而感到兴慰;第三,授于唐先生教诲的弟子将是有幸。从1988年开始,由W...最近拜读了本校唐继权先生编著的《全球定位系统(GPS)测量》教材,受益匪浅。第一,它对本校传统测量教学是一个度的突破、质的转变;第二,为本校同行中有这方面高科技人才而感到兴慰;第三,授于唐先生教诲的弟子将是有幸。从1988年开始,由Wild Leitz china Limited向我省测绘专家全面介绍GPS技术。事实上,世界上先进国家在1987年以前已利用GPS技术完成了对南极考察的测绘工作。十余年来,GPS技术迅速发展,南方测绘仪器公司研制的NGS—200开创了我国GPS机的先列。为了使更多的人了解当今先进的测量技术,本文就GPS系统、GPS基本原理、GPS接收机、POPS—后处理软件、NGS—200GPS等五个方面进行分别阐述。展开更多
文摘设计了一种用于高速流水线ADC的多相时钟产生电路。通过采用一种高灵敏度差分时钟输入结构和时钟接收电路,降低了输入时钟的抖动。该多相时钟产生电路已成功应用于一种12位250MSPS流水线ADC,电路采用0.18μm 1P5M 1.8 V CMOS工艺实现,面积为2.5 mm2。测试结果表明,该ADC在全速采样条件下对20 MHz输入信号的信噪比(SNR)为69.92 d B,无杂散动态范围(SFDR)为81.17 d B,积分非线性误差(INL)为-0.4^+0.65 LSB,微分非线性误差(DNL)为-0.2^+0.15 LSB,功耗为320 m W。
基金Doctor Foundation of Anhui University of Science and Technology.
文摘Based on the analyses for the characteristics of high precise GPS defor-mation monitor,according to the spatial relationship among the satellite, base point and monitoring point a new model and its corresponding algorithm were presented to solve the monitoring point deformation directly at single epoch. In this method the carrier phases is used as the basic observations, and the initial condition is precise baseline vectors obtained in the first period observations between the base point and monitoring point. This model is called the similar single difference model (SSDM). The main error sources effecting the accuracy of deformations were analyzed briefly, the single epoch algorithm of the receiver clock offset was advanced. The numerical results of test data show that the SSDM and the single epoch algorithm of receiver clock offset advanced are reliable and correct.
文摘最近拜读了本校唐继权先生编著的《全球定位系统(GPS)测量》教材,受益匪浅。第一,它对本校传统测量教学是一个度的突破、质的转变;第二,为本校同行中有这方面高科技人才而感到兴慰;第三,授于唐先生教诲的弟子将是有幸。从1988年开始,由Wild Leitz china Limited向我省测绘专家全面介绍GPS技术。事实上,世界上先进国家在1987年以前已利用GPS技术完成了对南极考察的测绘工作。十余年来,GPS技术迅速发展,南方测绘仪器公司研制的NGS—200开创了我国GPS机的先列。为了使更多的人了解当今先进的测量技术,本文就GPS系统、GPS基本原理、GPS接收机、POPS—后处理软件、NGS—200GPS等五个方面进行分别阐述。
