Calibre PEX层次化参数提取子电路含VDD、VSS的问题

swgchlry

xcell之类的都配置好了，tranistor level提取没问题，hier/NO RC提取出层次化网表，结果提出来的某个单元是如下这个鬼样子：* Created: Wed Feb 26 12:58:44 2014
* Program "Calibre xRC"
* Version "v2013.2_35.25"
*
.global VDD VSS
.subckt BUFX3 Y VDD VSS A
M0_noxref noxref_VSS noxref_A noxref_1 noxref_VSS nch L=1.8e-07 W=7.2e-07
+ AD=3.56743e-13 AS=3.744e-13 PD=2.73714e-06 PS=2.48e-06 NRD=0.688161
+ NRS=0.722222
M1_noxref noxref_Y noxref_1 noxref_VSS noxref_VSS nch L=1.8e-07 W=1e-06
+ AD=2.76667e-13 AS=4.95476e-13 PD=1.73333e-06 PS=3.80159e-06 NRD=0.276667
+ NRS=0.495476
M2_noxref noxref_VSS noxref_1 noxref_Y noxref_VSS nch L=1.8e-07 W=8e-07
+ AD=3.96381e-13 AS=2.21333e-13 PD=3.04127e-06 PS=1.38667e-06 NRD=0.619345
+ NRS=0.345833
M3_noxref noxref_VDD noxref_A noxref_1 noxref_VDD pch L=1.8e-07 W=1.08e-06
+ AD=4.74063e-13 AS=5.184e-13 PD=3.42189e-06 PS=3.12e-06 NRD=0.406433
+ NRS=0.444444
M4_noxref noxref_Y noxref_1 noxref_VDD noxref_VDD pch L=1.8e-07 W=1.36e-06
+ AD=3.672e-13 AS=5.96968e-13 PD=1.9e-06 PS=4.30905e-06 NRD=0.198529
+ NRS=0.322755
M5_noxref noxref_VDD noxref_1 noxref_Y noxref_VDD pch L=1.8e-07 W=1.36e-06
+ AD=5.96968e-13 AS=3.672e-13 PD=4.30905e-06 PS=1.9e-06 NRD=0.322755
+ NRS=0.198529
.ends
*... ...

貌似对VDD VSS的全局设置丝毫没起作用，不知道什么原因？

nhaiwen

你用spice vision 打开你的网表，就会生成一个视图，这样你就能看到VDD VSS的连接关系了。

jeffej

who know it???