How to switch on a pulse amplifier?

[lowell]

sir;

This is my problem: I fed a signal between 0.4Volts to 0.6Volts to a 2N3906 Transistor. I could not switch on the amplifier. How would i deal with this?

The Frequency is 5MHz.

Thank you..

LOwell

 

[IanP]

0.4V-0.6V voltage is to low to switch on a transistor ..
Try to increase this control voltage to >1V and connect a current limiting resistor in the transistor's base (for 1V signal use 33Ω<R<100Ω) ..

Regards,
IanP

 

[lowell]

This input signal is somewhat fixed because it is the output of the logic gates and will be fed to the said transistor..
Is it possible if we will put a comparator??

 

[IanP]

Usually, a logic gate output operate in wider range than 0.4-0.6V ..
But, if it is all you have you definitely need to amplify this signal and a comparator seems to be quite a good choice ..

Regards,
IanP

 

[lowell]

ok I will try..tanx..

Regards,
lowell

Added after 20 minutes:

sir:

do you have a design for a transistorized pulse amplifier..I had a hard time searching the net..

thank you

regards,
lowell

 

[IanP]

I certainly have one ..
Here is the link:

Regards,
IanP

 

[reggieboy]

i've seen the diagram. . .
is this a 5Mhz pulse?

 

[IanP]

This pulse amplifier should moretheless deal with 400ns pulses, but can you tell me who I am talking with: lowell or reggieboy ???

Regards,
IanP

 

[reggieboy]

we're a team. . . working together in a project. . . tnx 4 ur help. . . we really appreciate it. . .