need help _Power Amplifier

[Abhishekabs]

mrf6v2300n china

Hi friends,
I am searching transistor for making power amplifier with following specifications
1) Frequency "100MHz-400MHz"
2) Output power= Max 200Watts
3) Input RF drive level : -20dBm to 10 dBm
4) Operating temperature- 18deg to 50 deg centigrade

Can any one suggest any particular transistor? for this kind of application.

 

[vfone]

**broken link removed**

Whatever transistor you will find you need a few driver stages to get 53dBm (200W) at the output from 10dBm at the input.

 

[Abhishekabs]

Thanks VFone
This transistor is supporting 470Mhz to 860 MHz(UHF)
Is it also useful for VHF (100MHz to 300MHz)?
Because My requirement is Broad band power amplifier(100MHz to 400MHz)

 

[vfone]

I never use it in VHF but you can ask NXP.
In general the internal input/output matching in this kind of transistors is Low Pass, which allows using the transistor below the minimum specified frequency.
Just ask NXP, or try to get a sample and build a prototype.

 

[paow]

Hi Abhishekabs,

Book: RF Circuit Design Theory and Application, Ludwig and Bretchko, Prentice Hall
Microwave Engineering, David M. Pozar, WILEY

 

[dexter888]

Is the linearity specified? What kind of modulation is going to be used?

 

[ChaoFan]

I think there are many parts from Freescale can be the candidates. Like, MRF6V4300N, MRF6V2300N, MRF6VP2600H. Good luck!

 

[Element_115]

Do you want 200W with -20dBm in and 200W(53dBm) with +10dBm in ?

You will need an AGC Amp. Also you don't expect to have 1 Amp with 43dB
to 73dB of gain right? So you should do a gain line up :

Pin Min =-20dBm (assume ~10-20 dB gain from each amp)

Pin | AMPS & AGC | Out put
-20dBm + 20db + 20db (AGC w/min attenuation)+ 15 dB + 10dB + 10dB = +55dBm
10dBm + 20db + -10db (AGC w/max attenuation)+ 15 dB + 10dB + 10dB =+55dBm

The 2 dB of head room will be your margin (which you will most likely loose in the
layout& component variation ect...)


Good Luck\]

 

[molloy]

I believe the BLF872 is pre and postmatched to work in UHF band not in VHF band so you cant use it. There are some not postmatched ldmos that can easily deliver such a power in NXP or freescale portfolio

regards