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From: john larkin <jl@glen--canyon.com>
Newsgroups: sci.electronics.design
Subject: Re: amazing gan fet
Date: Sat, 21 Jun 2025 16:19:18 -0700
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On Sat, 21 Jun 2025 23:45:45 +0100, Martin Brown
<'''newspam'''@nonad.co.uk> wrote:

>On 20/06/2025 23:51, 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, $1.64 in hundreds, pretty good for what you get.  Analog switch FOM
>>>>> C_dg*R_on is about 1 ps, very impressive.
>>>>>
>>>>> I want its little brother, with that sort of speed and a g_m of 200 mS.
>>>>> Assuming it’s quiet, of course—apart from extrinsic effects it should be
>>>>> about sqrt(8/3 * kT/g_m) = 0.22 nV in 1 Hz.
>>>>
>>>> The smaller EPC parts are good, but lower volts and amps.
>>>>
>>>>>
>>>>> Cheers
>>>>>
>>>>> Phil Hobbs
>>>>>
>>>>> Cheers
>>>>>
>>>>> Phil Hobbs
>>>>
>>>> If I park the drain at +700 and drive the gate from 0 to +5 with a
>>>> BUF602, I estimate a fall time of 1 ns.
>>>>
>>>> Pretty good slew rate.
>>>>
>>>> People are making such fun toys these days.
>>>>
>>>> We spent yesterday at the MTTS microwave show downtown. All those
>>>> people are still stuck in the graph paper/slide
>>>> rule/s-parameter/VNA/load-pull world. I talked to a bunch of them
>>>> about using their parts in time domain, with Spice models, and got
>>>> vacant stares. Their world is all sine waves and dBm's.
>>>>
>>>> I met one cool guy from a brit company, LA Techniques Ltd. They make
>>>> VNAs and he grabbed my proto RF switch board and VNA'd it. And,
>>>> amazingly, did a bunch of digital data eye diagrams. From the VNA
>>>> data.
>>>>
>>>> https://www.dropbox.com/scl/fi/vsfe0bjm8a5ur7pp6fwms/s21_eye_2gbps.png?rlkey=8p17rq5sttnd31mbyqttw2umj&raw=1
>>>>
>>>> Hurts my head.
>>>
>>> 0.0750 ns/div. So clumsy. Haven't they ever heard of picoseconds?
>>>
>>> Jeroen Belleman
>> 
>> ps means pounds sterling I think.
>
>gbp is the currency designation aka £ which is shift 3 on a UK keyboard. 
>$ is shift 4.

Shift 3 is # here, pronounced "pound sign."

A pound is of course a unit of weight. Or force. Or maybe mass.