Hi,
I don´t understand.
Why do you want the nodes to be "fast"? I thought them as DC reference... and here the slower the less noise, the better the precision.
I´d add at least 100nF maybe 1uF. But I don´t know your requirements regarding speed
Do you want the LM4041 to continously switch ON and OFF? What timing
What does "...40mv as soon as possible..." in time?
And yes, they all are staggered low pass filters.
For sure there are many ways.. Each node may have a separate voltage divider (instead of a string).
Then each node is independent of the other and may be independently adjusted in voltage and settling time.
Klaus
Some comparators can throw "kickback noise" out
the inputs (as well as into ground) when they switch.
It's good to minimize the driven load, for the ground
bounce (which will then travel through those "filter"
caps to the other side, inputs to various other devices).
Kickback noise is unlikely to be simulated properly by
behavioral models, or even by transistor-level if the
chip parasitics and things like shoot-through current
in the output stage are not captured in detail.
Deciding which ground domain the comparator(s)
ought to live in, is a design question (effects of output
nastiness, vs input nastiness from ground-ground
transient divergence,
how's the HF PSRR look on
that comparator?).
First order approximation is cap value multiplied by paralel connection of resistance connected to node (or more precisely from node to small signal ground, which means, that supply is a ground and large cap too).Does anyone know how to calculate each tau or the general rule-of-thumb to estimate when e.g. node e (40mV) would reach it's 5 tau value? Are they all consecutive or staggered due to rise time of each preceding stage?
First order approximation is cap value multiplied by paralel connection of resistance connected to node (or more precisely from node to small signal ground, which means, that supply is a ground and large cap too).
However, with your RC ladder Elmore rule might work better.
My "mind shortcut".What does 'supply is a ground and large cap too' mean, please?
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