It is common practice to choose minimum transistor lengths of 4-5 times the minimum process technology length for analog designs. I wondered, whether this is also true for digital circuits? I'm currenty working with a NAND2-based SR-Latch in 180nm Technology and wondered if I should work with lengths of about 200nm or if values of at least 1 um for the transistor lengths were more convenient.
I would also be thankful for a deeper explaination of the provided answer.
Frederik Lesniewski ,
It is not common for digital design. For digital gates, we usually the minimum size of the technology for two reasons: area and speed. The benefit of increasing the L (and as a consequence W) is that you are going to have less process variability (it is not the main concern for you). If you were using a very new technology, you could use 2 x Lmin, 3 x Lmin to avoid some short channel effect. But it is not your case. Best,
- Badges
- Science topic
- Similar topics
- Correction