why long channel devices preferred in analog and short channel devices preferred in d

Status
Not open for further replies.
V

vinodh475

Newbie level 5
Joined
Sep 24, 2012
Messages
9
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Visit site
Activity points
1,349
why long channel devices preferred in analog and short channel devices preferred in digital?
 

Much of the low-frequency (1/F) noise generated in MOSFET devices is inversely proportional to the gate area. Thus for a desired L/W ratio, a longer longer L means a longer W giving more gate area and lower noise. And generally you want low noise in analog circuits since it affects dynamic range, whereas that noise has little effect on digital circuits. Since you always want minimum circuit area the digital circuits are built with minimum gate length.
 
Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…