[NLRS] PA3GIE 10GHz high power SSPA

[Dr. Gerald N. Johnson]

I read a couple weeks ago that the DB6NT 50 watt amp is $3500.

There are some bare chips from Triquint that will do 90 watts for only 
$240 each in small quantities. Trouble is they need wire bonding after 
soldering to the heat sink with Sn/Au alloy solder. I think there's a 
presentation this weekend at MUD that's not in the printed proceedings. 
Maybe it will be in the CD if there is a CD. Set for 3:30 Saturday:
"3:30 50W 10GHz SSPA using GaN, WA6KBL" from the presentation schedule. 
I wish I could see that presentation or read it. I have my own ideas 
thinking a Sn/Bi low temperature solder would be far easier to find and 
to use and that rather than multiple ball bonds one might solder down PC 
board traces right close to the bare chip and make the chip connections 
with silver bearing epoxy and thin copper foil. Then cover the assembly 
with a good curing board coating though that might increase the 
dielectric constant and be a poor quality dielectric at the same time. 
Just to project the chip from the atmosphere. There is a 10 watt version 
of the Triquint chip far less expensive that is like 1/8 th of the 90 
watt chip. In fact the S parameters on the high power chip are for the 
10 watt chip, repeated 8 or 9 times for the 90 watt part.

73, Jerry, K0CQ

On 10/19/2012 5:52 PM, Doug Reed wrote:
>
>
> <http://www.gie-tv.com/3cm/3cm-pa.html>
>
> For those of you who want to jump to the next level of 10GHz RF power,
> here is a 25 watt amp. Requires 200mw drive for 25W out. I didn't bother
> looking any deeper because I don't have EU1695 to spend.  :-)
>
> 73, Doug Reed, N0NAS.
> ______________________________________________________________
>