A specific target would typically be 'less than 1/3 of the value known
to just provoke trouble'.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-04-08 04:25, Ken Javor wrote:
Re: [PSES] Power Integrity Question If the answer to how much ripple
is too much, or how little ripple is good enough is in all cases, “it
depends,” then does that mean that the pursuit of power integrity has
a purely functional pass/fail criteria; i.e., that the unit operates
properly, as opposed to a specific target on ripple level?
Ken Javor
Phone: (256) 650-5261
------------------------------------------------------------------------
*From: *John Woodgate <j...@woodjohn.uk>
*Date: *Sat, 7 Apr 2018 17:58:36 +0100
*To: *Ken Javor <ken.ja...@emccompliance.com>,
<EMC-PSTC@LISTSERV.IEEE.ORG>
*Subject: *Re: [PSES] Power Integrity Question
I don't think that there is a general rule that doesn't have so many
exceptions as to be useless. Even a 'simple' audio power amplifier can
show this. A conventional linear amplifier can have very good PSRR
(power supply rejection ratio) but a Class D amplifier has zero dB
PSRR - none at all.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk <http://www.woodjohn.uk>
<http://www.woodjohn.uk>
Rayleigh, Essex UK
On 2018-04-07 17:41, Ken Javor wrote:
Power Integrity Question There are many learned
books/papers/discussions on how to achieve proper power integrity
by way of proper PCB layout and proper capacitor decoupling
techniques, but what is the goal? I don't mean the functional
goal, which is obvious, but rather what is the metric? Is it
ripple voltage peak-to-peak, maximum excursion, minimum excursion,
some rms value, or...?
This question is decoupled from achieving PI for the purpose of
controlling radiated emissions: just asking how close to pure
unadulterated dc a dc rail must be in order to be considered
properly functional.
Understand the answer will be different for an analog rail vs. a
digital one, and for different digital rails, but appreciate
insight into what constitutes acceptable power quality for all dc
rails used in a typical piece of electronics.
Thank you,
Ken Javor
Phone: (256) 650-5261
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