Re: amazing gan fet

On Fri, 20 Jun 2025 21:59:58 +0200, Jeroen Belleman
<jeroen@nospam.please> wrote:

On 6/20/25 18:01, john larkin wrote:

On Fri, 20 Jun 2025 14:36:06 -0000 (UTC), Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:
 

john larkin <jl@glen--canyon.com> wrote:

https://www.infineon.com/dgdl/Infineon-GS-065-004-6-L-TR-DataSheet-v01_00-EN.pdf?fileId=8ac78c8c8e7ead30018ebd3e1aea2dc9
>
700 volts, turns on to 10 amps with +5 on the gate, reverse transfer
capacitance 0.3 pF, cheap.
>
>

>
Yeah, $1.64 in hundreds, pretty good for what you get.  Analog switch FOM
C_dg*R_on is about 1 ps, very impressive.
>
I want its little brother, with that sort of speed and a g_m of 200 mS.
Assuming it’s quiet, of course—apart from extrinsic effects it should be
about sqrt(8/3 * kT/g_m) = 0.22 nV in 1 Hz.

 
The smaller EPC parts are good, but lower volts and amps.
 

>
Cheers
>
Phil Hobbs
>
Cheers
>
Phil Hobbs

 
If I park the drain at +700 and drive the gate from 0 to +5 with a
BUF602, I estimate a fall time of 1 ns.
 
Pretty good slew rate.
 
People are making such fun toys these days.
 
We spent yesterday at the MTTS microwave show downtown. All those
people are still stuck in the graph paper/slide
rule/s-parameter/VNA/load-pull world. I talked to a bunch of them
about using their parts in time domain, with Spice models, and got
vacant stares. Their world is all sine waves and dBm's.
 
I met one cool guy from a brit company, LA Techniques Ltd. They make
VNAs and he grabbed my proto RF switch board and VNA'd it. And,
amazingly, did a bunch of digital data eye diagrams. From the VNA
data.
 
https://www.dropbox.com/scl/fi/vsfe0bjm8a5ur7pp6fwms/s21_eye_2gbps.png?rlkey=8p17rq5sttnd31mbyqttw2umj&raw=1
 
Hurts my head.

>
0.0750 ns/div. So clumsy. Haven't they ever heard of picoseconds?
>
Jeroen Belleman

ps means pounds sterling I think.