Re: A collection of monographs on high accuracy electronics

JM <sunaecoNoSpam@gmail.com> wrote:

On Mon, 10 Jun 2024 15:14:40 -0400, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:
 

On 2024-06-09 21:43, Phil Hobbs wrote:

On 2024-06-09 20:55, JM wrote:

On Mon, 10 Jun 2024 00:29:17 -0000 (UTC), Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:
 

JM <sunaecoNoSpam@gmail.com> wrote:

On Sun, 9 Jun 2024 18:09:24 -0000 (UTC), Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:
 

Jeroen Belleman <jeroen@nospam.please> wrote:

On 6/9/24 19:02, ehsjr wrote:

On 6/7/2024 9:14 PM, JM wrote:

A collection of monographs on high accuracy electronics written
by Mr.
Chris Daykin, following his career predominantly in metrology.
 
Unfortunately Chris will be unable to complete the unfinished
monographs (having started end of life care) but there is plenty of
interest to any analogue engineer.
 
https://1drv.ms/b/c/1af24d72a509cd48/EZhO_rP5-glDmxtc4ZHycvYBhrsqmyC5tuZjt2NFFsS0gQ?e=Wq2Yj0
 
 

 
 
Thanks!
Ed

 
I have an issue with his definition of resistor noise power
as the product of open-circuit noise voltage and short-circuit
current. That makes no sense.
 
There's more than that, probably, but that just jumped out at
me.
 
Jeroen Belleman
 

 
It?s four times too high, for a start.
 
Cheers
 
Phil Hobbs

 
"It is shown elsewhere [1] that the noise power is four times the heat
energy which would flow down the conductors
from a warm source resistor to a matching cold resistor."
 

 
Which, if true, would solve all our energy problems, except that
thermodynamic systems would all be unstable.
 
The thermal noise power produced by a resistor into a matched load is kT
per hertz.

 

 
Sure, which is what he states.  By mentioning a hot and cold resistor
he makes it clear that net energy flow is from hot to cold, and that
the T refers to the hot source.
 

But apparently he says that it's four times larger than that.
 
I'm not making a microsoft account just to download the PDF, so if you
want to discuss it further, you could email it to me.
 
Cheers
 
Phil Hobbs
 
 
 

Bill was kind enough to send me a copy (thanks again, Bill), and right
there on P. 374, the author says,
 
Pn = 4kTB
 
which is a factor of four too high.
 

 
No it isn't. He is calculating the thermal noise power dissipated in an
unloaded resistor - something (or at least the related noise voltage)
which is actually required in the design process of a
transducer/amplifier low S/N system.  No engineer outwith some
RF/microwave areas (such are specifing antenna noise temperature) is
remotely interested in your definition of noise power as the maximum
power which can be extracted from a thermal source (ie by a conjugate
source match).  The vast majority of engineers (if asked to specify
resistor noise power) would present exactly the same equation as Daykin,
because they are interested in noise voltage (or current) only. 

John, I’m sorry that your friend is dying. The fact that it comes to us all
doesn’t make it any easier to take.

I’m reading his stuff, so far with interest, and have zero interest in
rubbishing it, or him.

You said yourself that it was unfinished, which means in part that he
didn’t get the chance to check the final version for errors.

This one error doesn’t mean that it’s worthless, just unfinished.

My first edition contained 107 errors that I know about, which fortunately
I was able to fix in later printings. So believe me, I understand the
problem.

Cheers

Phil Hobbs


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