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From: john larkin <jl@650pot.com>
Newsgroups: sci.electronics.design
Subject: Re: A collection of monographs on high accuracy electronics
Date: Sun, 09 Jun 2024 18:24:04 -0700
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On Mon, 10 Jun 2024 01:55:51 +0100, JM <sunaecoNoSpam@gmail.com>
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. 
>>
>>Cheers 
>>
>>Phil Hobbs 
>
>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.

If you connect two resistors, the noise voltages create an equivalent
thermal conductivity. I did the math once and I recall that any
reasonable real wires would conduct a lot more heat.

And in real life, capacitance will kill the bandwidth and the heat
transfer.