Aigneryu
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Hi, akenovic
The noise coupling from digital portion to analog one is difficult to estimate from the preliminary degin phase in mixed-signal circuit (your low triggered circuit may be treated so ). Most coupling is coming from poor layout or board design.
The noise analysis after layout is important for a unexperienced mixed-signal designer. Maybe you can use some softwares that can help you to justify your circuit after layout. For example, substratestorm.
You can also read Ken's paper on the subject of supply noise. which can be downloaded on this site, and the cadence whitepaper "Substrate Noise Analysis of Mixed-Signal Ics"
Hope they can give you an example or a startup.
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