I don't think that there is a general rule that doesn'thave 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
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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