Transistor Noise (Pnoise Analysis)

Status
Not open for further replies.
A

aok_fine

Junior Member level 1
Joined
Oct 27, 2011
Messages
19
Helped
1
Reputation
2
Reaction score
1
Trophy points
1,283
Location
Egypt
Activity points
1,404
I was trying to measure the noise of ONE transistor. I expected to see the flicker 10dB/dec line then the thermal noise floor.. But, actually, there's a step down in the floor at high freq .. I have no clue what is that.. The position of the step varies with the transistor length.( red = 1u & blue= 2u)

 

I don't know what you are measuring exactly, but this effect may be caused by device capacitance that will behave like a short circuit above certain frequency.
 
Yeah, I am now pretty sure u r right. The BW of the ct. is the same as where the step occurs. ThnQ
 
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…