Re: amazing gan fet

On 21/06/2025 8:51 am, john larkin wrote:

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.

Not anywhere I've lived. There is a special character for the job - £ - comparable with the $ symbol. Anyway, sensible people type nsec and psec.
--
Bill Sloman, Sydney