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From: Bill Sloman <bill.sloman@ieee.org>
Newsgroups: sci.electronics.design
Subject: Re: amazing gan fet
Date: Sun, 22 Jun 2025 01:11:18 +1000
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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
>