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Author Topic: i made a 4 layer board layout a 100khx esr meter design  (Read 2095 times)
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sphinx
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« on: November 07, 2022, 09:19:54 21:19 »

this a project from nuts and volts magazine 100khz capacitor esr meter

it is my first time i am fiddling with 4 layer board using top layer as signal it seemed enough while routing it
so i chosed to make the other layers as +5v -5v and a ground layer i am looking for input on the idea itself
and if i made a bad/good decision and if the routing istelf is ok, maybe the order of s.c. planes are in a good
order

one thing that could be changed is to use smaller footprint voltage regulators like SOT-223-4 or TO-252-3
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laws of physics are not laws at all, just assumptions and formulas that work as long as we don't figure something new that wrecks the calculations. the infinite onion try to peel that one
bobcat1
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« Reply #1 on: November 13, 2022, 08:06:01 08:06 »

this a project from nuts and volts magazine 100khz capacitor esr meter

it is my first time i am fiddling with 4 layer board using top layer as signal it seemed enough while routing it
so i chosed to make the other layers as +5v -5v and a ground layer i am looking for input on the idea itself
and if i made a bad/good decision and if the routing istelf is ok, maybe the order of s.c. planes are in a good
order

one thing that could be changed is to use smaller footprint voltage regulators like SOT-223-4 or TO-252-3

Hi
You should add a PDF schematic for anyone who don't have install the software
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sphinx
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« Reply #2 on: November 13, 2022, 10:54:30 10:54 »

info/docs are in the file above

here is pdf wirg schematics and layout
layer 1 = signal
layer 2 = +5v
layer 3 = -5v
layer 4 = gnd

layout is sorta straight forward
from left to rirght
power input
oscillator
capacitor test
panel output

p.s. every project i make i have a folder with documentation and other extra info like compoent exchange or other info

a schematic was already in the doc/info  folder
« Last Edit: November 13, 2022, 03:05:36 15:05 by sphinx » Logged

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digitalmg
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« Reply #3 on: November 13, 2022, 03:19:36 15:19 »

For 4-Layer Stackup.
Very common, but not ideal Stackup
Top layer 1 - High Speed Signals
      layer 2 - GND
      layer 3 - Power Plane
      layer 4 - Low Speed Signals

Recommended
Top layer 1 - Signals/Power
      layer 2 - GND
      layer 3 - GND
      layer 4 - Signals/Power
Why? there is a lot to explain, watch a webinar that explains why:
https://go.teledynelecroy.com/l/48392/2022-05-12/8g9wzc?&utm_source=si-academy&utm_medium=banner-ad&utm_campaign=22-06-14-bogatin-3-design-tricks

I think you should change layer 2 to be gnd. 
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Sideshow Bob
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« Reply #4 on: November 13, 2022, 04:02:44 16:02 »

For 4-Layer Stackup.
Very common, but not ideal Stackup
Top layer 1 - High Speed Signals
      layer 2 - GND
      layer 3 - Power Plane
      layer 4 - Low Speed Signals

Recommended
Top layer 1 - Signals/Power
      layer 2 - GND
      layer 3 - GND
      layer 4 - Signals/Power
Why? there is a lot to explain, watch a webinar that explains why:
https://go.teledynelecroy.com/l/48392/2022-05-12/8g9wzc?&utm_source=si-academy&utm_medium=banner-ad&utm_campaign=22-06-14-bogatin-3-design-tricks

I think you should change layer 2 to be gnd. 
I think in this particular design with 100Khz signals. It do not matter much much. In fact 4 layers is kind of overkill. Not that it will do any harm though. 
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bigtoy
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« Reply #5 on: November 13, 2022, 07:40:34 19:40 »

Agreed - 4 layers won't really help anything, but it won't hurt either (well, aside from the hurt wallet due to the more expensive PCB).

Just a warning that if changing to a smaller voltage regular package, first make sure you know its power dissipation. Sometimes a larger part is required for dissipating the heat.
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sphinx
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« Reply #6 on: November 13, 2022, 08:09:03 20:09 »

yes one has to think about the thermal aspect of a smaller package, i was also thinking about the price as well
if a smaller package was more expensive, i wouldnt choose it
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laws of physics are not laws at all, just assumptions and formulas that work as long as we don't figure something new that wrecks the calculations. the infinite onion try to peel that one
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