transistor frequency problem

Status
Not open for further replies.
R

rky

Junior Member level 1
Joined
Nov 13, 2009
Messages
17
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Location
india
Activity points
1,380
hi..........
i want to know that how to find minimum and maximum frequency of any transistor form data sheet.........
because i saw many data sheet but unable to know about the frequency range....
i am searching about high frequency power transistor like BU508.....
please help me.....
thank you
rky
 

Generally, there is no low frequency limit.

The high frequency limit depends on how you use the transistor. Assume the gain will never be more than unity at 'ft' on the data sheet.

I would class the BU508 as a low frequency transistor, it's ft is only 7MHz, you can get them into tens of GHz.

Brian.
 

    R

    rky

    Points: 2
    Helpful Answer Positive Rating
thanks............
so there is a relation between gain and frequency as you said.....
so can we put gain lesser than 1 but frequency higher???
thank you
 

Yes you can but what would it achieve. A gain of less than 1 is attenuation and it could be better done with a resistor.

Brian.
 

actually i m looking for voltage amplification.....not current....
so will it be sufficient??
 

it means that is there voltage amplification if my gain gone lesser than unity.....???
because above said that there is current amplification......
bt actually i dnt want to amplify current....i am looking for voltage amplification...
 

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…