OT: milestone, the x-Chapters

[John Larkin]

On Wed, 26 Jun 2019 07:37:32 -0500, John S <Sophi.2@invalid.org>
wrote:

On 6/25/2019 9:05 AM, John Larkin wrote:
On 24 Jun 2019 23:19:47 -0700, Winfield Hill <winfieldhill@yahoo.com
wrote:

John Larkin wrote...

The progressive-railing thing would be as good
as the parts you care to buy. 0.1% should be
possible.

OK, precision railing to say 1%, OK. But at
the highest gains, the fixed-value input-stage
feedback resistor, and the input offset ...
Explain that for us.

Is this an electronics discussion or a book promotion?

John, you are usually not so unkind.

Crabby lately, I guess. But this extended teasing is getting boring.


--

John Larkin Highland Technology, Inc

lunatic fringe electronics

 

[Tom Del Rosso]

Jan Panteltje wrote:

On a sunny day (Wed, 26 Jun 2019 04:48:16 -0400) it happened "Tom Del
Rosso" <fizzbintuesday@that-google-mail-domain.com> wrote in

So the 2 opamps in the second stage produce 2 oututs that both go to
an ADC. A uP chooses an input but there is no other switching.
There are 2 JFETS but they aren't used to change the gain of any
stage.

Since there is no gain switching, is there some kind of feedback that
causes a change in "bias" on the input stage? But no, that would
oscillate.

It would oscillate, but you could only use the value that makes sense,
start:
nothing railed: use the higest gain
if 1 railed, use the next one up
else if 2 railed activate JFET1, test again
if still 2 railed also activate JFET2 and test again.
if still 2 railed sound the super-nova alarm
else use the one that is not railed .. .math.. output
go to start

?

I thought of that but you have to control the oscillation. It's not
enough to slow it down with the 2 allowed caps because you have to catch
it at a peak. Then I thought the JFETs could make it latch but that
would be like the forbidden switching.

 

[George Herold]

On Wednesday, June 26, 2019 at 10:52:18 AM UTC-4, Winfield Hill wrote:

John Larkin wrote...

Crabby lately, I guess. But this extended
teasing is getting boring.

As soon as you and Phil, etc., are finished
thinking about it as a puzzle, I'll put up
the section, and paper reference. Ready yet?

Yeah! I've got my guess and if you post something I won't have
to spice or bread board it.

George H.

--
Thanks,
- Win

 

[Winfield Hill]

John Larkin wrote...

On 26 Jun 2019 07:52:00 -0700, Winfield Hill <winfieldhill@yahoo.com
wrote:

John Larkin wrote...

Crabby lately, I guess. But this extended
teasing is getting boring.

As soon as you and Phil, etc., are finished
thinking about it as a puzzle, I'll put up
the section, and paper reference. Ready yet?

Good grief, it's not even your idea.

Yes, it's not my idea, but it's a great idea.
(Only a fraction of the cool stuff in our book
is ours. But we do enjoy giving attribution.)

It was published in 2012, yet nobody seems to
know about it. The concept is simple, but the
implementation is subtle. It's powerful and
easily applied, so I felt that it needs to get
published and promoted.


--
Thanks,
- Win

 

[John Larkin]

On 26 Jun 2019 07:52:00 -0700, Winfield Hill <winfieldhill@yahoo.com>
wrote:

John Larkin wrote...

Crabby lately, I guess. But this extended
teasing is getting boring.

As soon as you and Phil, etc., are finished
thinking about it as a puzzle, I'll put up
the section, and paper reference. Ready yet?

Good grief, it's not even your idea.


--

John Larkin Highland Technology, Inc

lunatic fringe electronics

 

[Winfield Hill]

John Larkin wrote...

Crabby lately, I guess. But this extended
teasing is getting boring.

As soon as you and Phil, etc., are finished
thinking about it as a puzzle, I'll put up
the section, and paper reference. Ready yet?


--
Thanks,
- Win

 

[John Larkin]

On 26 Jun 2019 08:33:49 -0700, Winfield Hill <winfieldhill@yahoo.com>
wrote:

John Larkin wrote...

On 26 Jun 2019 07:52:00 -0700, Winfield Hill <winfieldhill@yahoo.com
wrote:

John Larkin wrote...

Crabby lately, I guess. But this extended
teasing is getting boring.

As soon as you and Phil, etc., are finished
thinking about it as a puzzle, I'll put up
the section, and paper reference. Ready yet?

Good grief, it's not even your idea.

Yes, it's not my idea, but it's a great idea.
(Only a fraction of the cool stuff in our book
is ours. But we do enjoy giving attribution.)

It was published in 2012, yet nobody seems to
know about it. The concept is simple, but the
implementation is subtle. It's powerful and
easily applied, so I felt that it needs to get
published and promoted.

I'll check the thread again in a couple of months and see if it's
revealed.


--

John Larkin Highland Technology, Inc

lunatic fringe electronics

 

[Winfield Hill]

John Larkin wrote...

I'll check the thread again in a couple
of months and see if it's revealed.

Yep, you and Phil, I think, were done
playing the game, so I put it up.

9-decade transimpedance amplifier


--
Thanks,
- Win

 

On Wednesday, 26 June 2019 19:55:25 UTC+1, Winfield Hill wrote:

John Larkin wrote...

I'll check the thread again in a couple
of months and see if it's revealed.

Yep, you and Phil, I think, were done
playing the game, so I put it up.

9-decade transimpedance amplifier

where?


NT

 

[Phil Hobbs]

On 6/26/19 10:52 AM, Winfield Hill wrote:

John Larkin wrote...

Crabby lately, I guess. But this extended
teasing is getting boring.

As soon as you and Phil, etc., are finished
thinking about it as a puzzle, I'll put up
the section, and paper reference. Ready yet?

I have a current product that uses essentially that technique, minus the
seventeen extraneous op amps.

It uses a bootstrapped cascode with multiple loads in the collector
circuit, with low-capacitance Schottky diodes connected to low-Z bias
levels to keep the whole string from saturating, and diff amps to pull
out the linear response. It's reasonably fast as well as wide range,
though not as wide as 1e9.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com