bias of Gilbert-cell mixer

Status
Not open for further replies.
S

symsnowfairy

Junior Member level 1
Joined
May 6, 2008
Messages
18
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Location
Germany
Activity points
1,393
gilbert cell mixer

Excuse me, for bias of Gilbert-cell mixer, what is optimum Vbe of LO transistors? How could I bias them to realize switches?

Thanks in advance!
 

gilbert-cell mixer

the LO pairs in ideal case they should work as swtiches so u need to bias the BJT near the turn on , so the LO can make the transistor work properly

Khouly
 
gilbert cell biasing

does it mean that Vbe is almost 0.7V?
 

symsnowfairy said:
Excuse me, for bias of Gilbert-cell mixer, what is optimum Vbe of LO transistors? How could I bias them to realize switches?

Thanks in advance!
Click to expand...

Yes, it should be work as a switch.
So I bias it to make the Vce≈Vbe.
And you should simulation the IP3 of it to select the best point.
 

no,Vce cannot equal to Vbe ,Vbe shoud be 0.7v
 

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…