As most PSs for digital circuitry include a regulator, it's output
impedance at 1Hz is low enough to "filter" most out of it - see the load
transient response diagram of the used regulator - as the open loop gain
of the regulator's internal error amplifier at such a low frequency is
practically equal to that of DC gain.
While the 1Hz component is of no concern (power consumption left aside),
the fast edges pose a higher demand on proper decoupling.
On 5/15/2012 9:45 PM, [email protected] wrote:
The narrow pulses are easily filtered by the power supply because the frequency
distribution of the power consumption has a much smaller component at 1Hz.
At 1Hz, the power supply filters nothing.
Didier KO4BB
Sent from my BlackBerry Wireless thingy while I do other things...
-----Original Message-----
From: Mike S<[email protected]>
Sender: [email protected]
Date: Mon, 14 May 2012 20:44:04
To:<[email protected]>
Reply-To: Discussion of precise time and frequency measurement
<[email protected]>
Subject: Re: [time-nuts] Why are 1PPS signals so skinny?
On 5/14/2012 8:21 PM, Tom Van Baak wrote:
one day during an experiment where I was
comparing a large set of clocks I noticed my lab's digital AC power
meter was jumping by tens of watts every second.
The last thing you want
in a precision timing lab is to load your AC line down exactly once a
second.
How does a short pulse help? It's still "tens of watts every second,"
but instead of lasting 0.5 seconds, it lasts 0.00005 seconds. Less power
used overall, but still the same sudden change on the second.
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
