Power Abreviations

Status
Not open for further replies.
Someone Electro said:
Vss and Vdd is mostly used by digital circuits.
Click to expand...

Actually it's usually CMOS circuits, as Vss refers to source voltage and Vdd refers to drain voltage.
 
**broken link removed**

Why do most circuits I've seen have been using Vss for ground and Vcc, Vdd for the positive supply?
 
Joel Rainville said:
http://www.maxim-ic.com/glossary/index.cfm/Ac/V/ID/943/Tm/VDD/ln/en

Why do most circuits I've seen have been using Vss for ground and Vcc, Vdd for the positive supply?
Click to expand...

Because the DRAIN of the FET's goto to positive (Vdd), the collector of a bipolar IC goto positive (Vcc), and the SOURCE of the FET goes to ground (Vss).

These obviously apply to NPN and N channel devices, but it's common practice for IC's, and used regardless of polarity (a chip will almost certainly have BOTH polarity devices internally anyway!).
 
Status
Not open for further replies.

Similar threads

M
  • Question
Power factor
Replies
2
Views
635
rjenkinsgb
D
ATX power supply Reset/0v Issue?
Replies
3
Views
199
Reloadron
T
  • Question
MW LDH-45A-700W power supply?
Replies
3
Views
320
rjenkinsgb
G
24 vdc Power supply problem.
Replies
8
Views
2K
Reloadron
A
  • Question
12V LM317 variable power supply, pot got burned.
Replies
19
Views
2K
Nigel Goodwin
Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…