> On 2023-03-25 13:41, bitrex wrote:
>> I've read that the exponential behavior predicted in e.g. RC circuits
>> by taking the Laplace-domain impedance of capacitors to be 1/sC leads
>> to a causality violation, and that after much testing of many
>> capacitors some guys named Westerlund and Eklam determined that the
>> true behavior is a probably a power law, which I guess means the dv/dt
>> in I = C dv/dt would actually have to be some kind of fractional
>> derivative.
>>
>> Can anyone elaborate on why this is so?
>
> 'T'ain't so. Just another casualty of causality.
>
> (People, especially assistant professors, periodically announce
> causality violations due to mistaking group delay for true delay(*) or
> measuring logic transitions by output threshold crossings with a slowish
> input.
>
> Cheers
>
> Phil Hobbs
>
> (*) I did that myself once, in this very boutique.
>
> I've read that the exponential behavior predicted in e.g. RC circuits by
> taking the Laplace-domain impedance of capacitors to be 1/sC leads to a
> causality violation, and that after much testing of many capacitors some
> guys named Westerlund and Eklam determined that the true behavior is a
> probably a power law, which I guess means the dv/dt in I = C dv/dt would
> actually have to be some kind of fractional derivative.
>
> Can anyone elaborate on why this is so?
'T'ain't so. Just another casualty of causality.
(People, especially assistant professors, periodically announce
causality violations due to mistaking group delay for true delay(*) or
measuring logic transitions by output threshold crossings with a slowish
input.
Cheers
Phil Hobbs
(*) I did that myself once, in this very boutique.
--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510
http://electrooptical.nethttp://hobbs-eo.com
Reply by Fred Bloggs●March 25, 20232023-03-25
On Saturday, March 25, 2023 at 1:41:59 PM UTC-4, bitrex wrote:
> I've read that the exponential behavior predicted in e.g. RC circuits by
> taking the Laplace-domain impedance of capacitors to be 1/sC leads to a
> causality violation, and that after much testing of many capacitors some
> guys named Westerlund and Eklam determined that the true behavior is a
> probably a power law, which I guess means the dv/dt in I = C dv/dt would
> actually have to be some kind of fractional derivative.
>
> Can anyone elaborate on why this is so?
Two morons over their head.
Reply by bitrex●March 25, 20232023-03-25
I've read that the exponential behavior predicted in e.g. RC circuits by
taking the Laplace-domain impedance of capacitors to be 1/sC leads to a
causality violation, and that after much testing of many capacitors some
guys named Westerlund and Eklam determined that the true behavior is a
probably a power law, which I guess means the dv/dt in I = C dv/dt would
actually have to be some kind of fractional derivative.
Can anyone elaborate on why this is so?