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Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them.

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It seems, my 1st try did not work

Am 05.09.24 um 16:49 schrieb Phil Hobbs:

 > The reason I care about getting such accurate bootstraps is a bit
 > subtle--probably I'd have enough bandwidth improvement with a gain of
 > 0.9, but that extra 10% shows up as a gnarly settling transient at late
 > times, which screws up measurements.  0.9997 is dramatically better.

I've played with Bob Widlar's FET follower replacement:

< 
https://www.flickr.com/photos/137684711@N07/53830817262/in/dateposted-public/ 
    >

Gain seems to be 1.000 and noise is quite OK.
I wonder how this would work with today's transistors such as
BFP840 & friends. And no PNPs.
I have not yet built it.

E1 makes a noisy Vcc to see how many nV/rtHz I need there,
Q4, Q5 are just parking lots. V3 prevents Spice from crashing.

---
Vceo is no problem ( slightly older post)
Nobody forces us to leave the base open.


 > Cheers
Gerhard

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Drat. NTE is gone, and they took the last 5-GHz PNP with them. Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2024-09-04 17:54 -0400
  Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. john larkin <jlarkin_highland_tech> - 2024-09-04 19:50 -0700
    Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2024-09-05 07:22 +0000
  Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. Jan Panteltje <alien@comet.invalid> - 2024-09-05 06:15 +0000
    Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2024-09-05 07:30 +0000
      Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. john larkin <jlarkin_highland_tech> - 2024-09-05 07:14 -0700
        Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2024-09-05 10:49 -0400
          Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. john larkin <jl@650pot.com> - 2024-09-05 15:06 -0700
            Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2024-09-05 22:44 +0000
              Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. john larkin <jl@650pot.com> - 2024-09-05 15:55 -0700
                Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2024-09-06 00:07 +0000
                Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. Jan Panteltje <alien@comet.invalid> - 2024-09-06 06:44 +0000
            Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. bitrex <user@example.net> - 2024-09-07 23:40 +0000
              Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2024-09-08 00:02 +0000
                Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2024-09-08 00:16 +0000
          Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. Gerhard Hoffmann <dk4xp@arcor.de> - 2024-09-06 01:43 +0200
            Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. john larkin <jl@650pot.com> - 2024-09-05 16:58 -0700
            Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2024-09-06 00:13 +0000
  Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. Bill Sloman <bill.sloman@ieee.org> - 2024-09-05 21:15 +1000
    Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. bitrex <user@example.net> - 2024-09-05 14:24 +0000
      Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2024-09-05 18:17 +0000
        Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. Gerhard Hoffmann <dk4xp@arcor.de> - 2024-09-05 20:57 +0200
          Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2024-09-05 19:58 +0000
  Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. Chris Jones <lugnut808@spam.yahoo.com> - 2024-09-06 22:47 +1000
    Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. Gerhard Hoffmann <dk4xp@arcor.de> - 2024-09-06 17:31 +0200
    Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2024-09-06 13:33 -0400
  Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. Joerg <news@analogconsultants.com> - 2024-09-06 15:59 -0700
    Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2024-09-07 21:46 +0000
      Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. Joerg <news@analogconsultants.com> - 2024-09-09 14:02 -0700
  Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2024-09-09 21:59 -0400
    Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2024-09-09 22:12 -0400

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