Stable CE to unstable CE ?

Status
Not open for further replies.
J

JPdP

Junior Member level 1
Joined
Feb 10, 2005
Messages
15
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Visit site
Activity points
127
I would like to use the CE topology for an DRO Oscillator design but, I just doen't get the topology unstable. I've tried an inductor and later an capacitor in shunt with a resistor at the emitter to ground, to see if I can get K < 1 , |S11| and |S22| >1. I just can't get it to work.

Any tips/ideas would greatly be apresiated.

regards
 

Well, that is pretty unusual. I usually have all sorts of trouble making anything stable!!! What are you using, fet, bipolar, frequency? Maybe you need a device with more gain at your frequency. Just about any common base transistor will easily go unstable.
 

I've tried the AT41470, AT41486 and BFP420 transistors @ 4.7GHz. In common base they are unstable, but I need to know if it is possible to make these transistors unstable in Common Emitter configuration.

I'm busy researching DRO's using BJT's and would like to learn these techniques/tricks.

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…