随着工艺尺寸的不断缩小,电路规模的不断复杂化以及版图中寄生规模的不断增大,在一些大规模的后仿验证过程中,Cadence公司提供的模拟全精度仿真器Spectre/APS/APS RF已不能满足需求。针对这一问题,Cadence于2019年推出APS的下一代模拟...随着工艺尺寸的不断缩小,电路规模的不断复杂化以及版图中寄生规模的不断增大,在一些大规模的后仿验证过程中,Cadence公司提供的模拟全精度仿真器Spectre/APS/APS RF已不能满足需求。针对这一问题,Cadence于2019年推出APS的下一代模拟全精度仿真器Spectre X,在实际使用过程中发现其对普通模拟仿真性能提升明显并且基本保持了APS的仿真精度。2020年,Cadence推出其APS RF的下一代仿真器Spectre X RF仿真器。RF仿真在整体仿真验证流程中同样占据很大一部分,在将其应用到实际项目前,需要与APS RF对比其性能和速度。介绍了Spectre X RF的用法,并重点介绍在几种采用不同工艺的RFIC设计中,仿真器Spectre APS RF与Spectre X RF仿真性能与精度的对比情况。展开更多
This paper uses three size metrics,which are collectable during the design phase,to analyze the potentially confounding effect of class size on the associations between object-oriented（OO）metrics and maintainability...This paper uses three size metrics,which are collectable during the design phase,to analyze the potentially confounding effect of class size on the associations between object-oriented（OO）metrics and maintainability.To draw as many general conclusions as possible,the confounding effect of class size is analyzed on 127 C＋＋ systems and 113 Java systems.For each OO metric,the indirect effect that represents the distortion of the association caused by class size and its variance for individual systems is first computed.Then,a statistical meta-analysis technique is used to compute the average indirect effect over all the systems and to determine if it is significantly different from zero.The experimental results show that the confounding effects of class size on the associations between OO metrics and maintainability generally exist,regardless of whatever size metric is used.Therefore,empirical studies validating OO metrics on maintainability should consider class size as a confounding variable.展开更多
文摘随着工艺尺寸的不断缩小,电路规模的不断复杂化以及版图中寄生规模的不断增大,在一些大规模的后仿验证过程中,Cadence公司提供的模拟全精度仿真器Spectre/APS/APS RF已不能满足需求。针对这一问题,Cadence于2019年推出APS的下一代模拟全精度仿真器Spectre X,在实际使用过程中发现其对普通模拟仿真性能提升明显并且基本保持了APS的仿真精度。2020年,Cadence推出其APS RF的下一代仿真器Spectre X RF仿真器。RF仿真在整体仿真验证流程中同样占据很大一部分,在将其应用到实际项目前,需要与APS RF对比其性能和速度。介绍了Spectre X RF的用法,并重点介绍在几种采用不同工艺的RFIC设计中,仿真器Spectre APS RF与Spectre X RF仿真性能与精度的对比情况。
基金The National Natural Science Foundation of China(No.60425206,60633010)
文摘This paper uses three size metrics,which are collectable during the design phase,to analyze the potentially confounding effect of class size on the associations between object-oriented（OO）metrics and maintainability.To draw as many general conclusions as possible,the confounding effect of class size is analyzed on 127 C＋＋ systems and 113 Java systems.For each OO metric,the indirect effect that represents the distortion of the association caused by class size and its variance for individual systems is first computed.Then,a statistical meta-analysis technique is used to compute the average indirect effect over all the systems and to determine if it is significantly different from zero.The experimental results show that the confounding effects of class size on the associations between OO metrics and maintainability generally exist,regardless of whatever size metric is used.Therefore,empirical studies validating OO metrics on maintainability should consider class size as a confounding variable.
