PA design using NE6500379A

[pigpig]

Hi,

I have try to use NE6500379A to design a power amplifier at 900MHz. However, when I measured, the S21 is 4dB lower than what I simulated. Moreover, how should I design a pa in getting at least certain gain. I do not require very high gain. Pls help me if any useful design notes on pa, of course, simplier will be much better.

Thanks a lot!

Candy

 

[microstrip_line]

maybe saturated, or mismatch, I think

 

[Element_115]

Hi
I just had the same experience. My sim in @dS looked great.
but the PA was tuned too high in freq. See if you get you expected
gain/power at some other freq too. Well I'm on my second layout and
is what I did this time was go to the LDMOS FET data sheet and look
at the Impedance (at "Opt pwr/Gain") and used these values for the
"TERMS" and "PORTS" (for MoMe|\|Tum) . This new layout did agree
with the tuning I did to get the first board working.

Hope this will help.
Good luck.

 

[RF_beginner]

the distributed parameter is unsteady and difficult to control.the factual ways is to do more experiment ,conclud,refer to theory and so on.

 

[pva]

I haven’t problems with NE6500379 in L-band, look carefully your simulation. Applications from CEL are very helpful.