I am designing an RF PA which is almost ready. I used a VCVS to convert my differential input signal. But now, I am supposed to make an RF Amplifier as well, which doesn't necessarily amplify very much, but can convert my differential input signal to a single-ended one. What I am looking for is an inductorless type. My operating frequency is 2.4GHz, so the traditional lower frequency OpAmps don't help.

Please let me know if any idea poped into you.

Regards

so...?

Actually, the what i knew was using an Op-Ampl and trying to seprate it's poles and getting small gain out of it at the intended frequency. that's practical for under 1GHz as the TI suggests but not for the 2.45GHz.

Another method is using charge pumps, but that's not helpful in ultra low power (-10dBm).

almost all I found in searching the databases is about differential low noise amplifiers whcih are either single-ended input and differential output or they are totally differential.

So, have you got any idea or any document that can link it here?

yes, you are right, but the fact is utelizing a differential pair and even mirroring the output consumes lots of current and the poles that are created make the amplifier have a gain far below 0dB, in 2.4GHz.

But if there is a way to increase the gain and seperate the poles to very high distance and get even unity gain, that would be helpful.

But, maybe it is easier to kill one side of the input and just amplify one.

Diff pair to a resistor load that is differential.  Then to convert to single ended try using a  "totem pole circuit",  you can look them up on the internet for a schematic. or you can connect to one of the resistors as suggested by carlgrace  and use  "white's cascode" to buffer this output.

http://rfcooltools.com