Hi Ken,
Good question, and as you already suspect, there is no clear, generic
answer (and for the same reason there is no such thing as typical
electronics). Having practiced this art for decades, and teaching
courses (up to five days in length) on the subject, the best we can do
is to explain all possible factors that eventually the responsible
designer has to take into account.
You will find pieces of the answer in various books and on the
publications posted on my website, for instance
http://www.electrical-integrity.com/Paper_download_files/Ansoft_EMI_Workshop_SUN_for_22Aug07_v2.pdf
Regards,
Istvan Novak
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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