Sujet : Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them.
De : jl (at) *nospam* 650pot.com (john larkin)
Groupes : sci.electronics.designDate : 06. Sep 2024, 00:58:35
Autres entêtes
Message-ID : <o9hkdj165jglf4dm51im6sctim1hk0bt2l@4ax.com>
References : 1 2 3 4 5 6
User-Agent : ForteAgent/8.00.32.1272
On Fri, 6 Sep 2024 01:43:20 +0200, Gerhard Hoffmann <
dk4xp@arcor.de>
wrote:
>
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
BUF602 is a fabulous part, but it's crazy noisy by Phil's standards.
| Date | Sujet | # | | Auteur |
| 4 Sep 24 |  Drat. NTE is gone, and they took the last 5-GHz PNP with them. | 28 | | Phil Hobbs |
| 5 Sep 24 |  Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. | 2 | | john larkin |
| 5 Sep 24 |    Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. | 1 | | Phil Hobbs |
| 5 Sep 24 | Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. | 14 | | Jan Panteltje |
| 5 Sep 24 | Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. | 13 | | Phil Hobbs |
| 5 Sep 24 |  Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. | 12 | | john larkin |
| 5 Sep 24 | Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. | 11 | | Phil Hobbs |
| 6 Sep 24 | Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. | 7 | | john larkin |
| 6 Sep 24 | Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. | 4 | | Phil Hobbs |
| 6 Sep 24 | Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. | 3 | | john larkin |
| 6 Sep 24 | Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. | 2 | | Phil Hobbs |
| 6 Sep 24 | Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. | 1 | | Jan Panteltje |
| 8 Sep 24 | Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. | 2 | | Phil Hobbs |
| 8 Sep 24 | Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. | 1 | | Phil Hobbs |
| 6 Sep 24 | Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. | 3 | | Gerhard Hoffmann |
| 6 Sep 24 | Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. | 1 | | john larkin |
| 6 Sep 24 | Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. | 1 | | Phil Hobbs |
| 5 Sep 24 | Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. | 4 | | Bill Sloman |
| 5 Sep 24 | Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. | 3 | | Phil Hobbs |
| 5 Sep 24 | Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. | 2 | | Gerhard Hoffmann |
| 5 Sep 24 | Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. | 1 | | Phil Hobbs |
| 6 Sep 24 | Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. | 1 | | Gerhard Hoffmann |
| 6 Sep 24 | Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. | 1 | | Phil Hobbs |
| 7 Sep 24 | Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. | 3 | | Joerg |
| 7 Sep 24 | Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. | 2 | | Phil Hobbs |
| 9 Sep 24 | Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. | 1 | | Joerg |
| 10 Sep 24 | Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. | 2 | | Phil Hobbs |
| 10 Sep 24 | Re: Drat. NTE is gone, and they took the last 5-GHz PNP with them. | 1 | | Phil Hobbs |