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GaN VHF Broadband Power Amlifier

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Andrew77

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GaN VHF Broadband Power Amplifier

I'm designing a 20-500 MHz power amplifier (100W)with GaN technology @ 28V Vdrain. I'm not sure if using 2 transistor in a push-pull configuration or using 1 transistor and microstrip, considering that GaN has a higher in-out impedances than LDmos. I'm thinking of using CREE or Nitronex devices,
any suggestion?
Thanks
Andrea
 

Well, good luck. These devices do have very low output impedances, so building a transformer over that bandwidth will be challenging.

Maybe you could do something unique and combine the output impedances in series somehow with a stackup. Lets say one device has 5 ohms output impedance. If you could design a structure to connect 5 of those outputs in series, you would have a 25 ohm impedance to match to the 50 ohm output. At these lower frequencies, maybe it could be done.
 

Hello Biff44,
you say: "combine the output impedances in series....If you could design a structure to connect 5 of those outputs in series..." how it could be possible? The final stage must not have more than two transistors otherwise I buy the amplifier
 

Hello Andrew77,
For this kind application, in NXP website there is a 120W application note with BLF645 from 10mhz to 600mhz, maybe you can take it as reference.
**broken link removed**
 
if i wanna use the 145 MHz frequency
What do I need to set??
please help me
Regard:
_haryo_
 

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