Difference of current and voltage biasing

Status
Not open for further replies.
M

malaganas

Newbie level 4
Joined
Jan 23, 2015
Messages
7
Helped
0
Reputation
0
Reaction score
0
Trophy points
1
Visit site
Activity points
45
Hi,

What is the difference of biasing a transistor with a dc current source at its gate instead of a dc voltage source?

Regards
 

Hi,

I´m sorry, I was not very clear before. I was more interested in differential pairs, I have seen different architectures where the gate of the biasing transistor is sometimes a dc voltage and sometimes a current source.

Can someone explain me the difference here?

Regards
 

If you use resistor, the tail current will be variable with temperature and bias condition of the pair transistors and also a voltage drop will occur across the resistor for nothing.If you use a current source, it will be independent from temp. and any extra voltage drop won't occur..
 

Hi,

Yes current source should be. Now you achieve this current source with a biasing transistor.

My question is what is the difference biasing this transistor with a dc current and a dc voltage.

Regards
 

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…