what is library design and modeling

Hi,
I found circuit design houses often have groups doing library design
and modeling. What are they doing? What skills are needed?

Thank you!

sincerely

 

for circuit reuse. to finish a project in time, a designer will focus
on important blocks and get the regular blocks, e.g. opamp, comparator
from the library directly.

xiaofeng

 

Hi,
So it means every time when the technology changes, the library must be
remodelled and relayouted?
What are those important tools to do such kind of jobs?

sincerely
-------------
Kuan Zhou
ECSE department