Sonsivri
 
*
Welcome, Guest. Please login or register.
Did you miss your activation email?
March 28, 2024, 02:00:58 14:00


Login with username, password and session length


Pages: [1]
Print
Author Topic: i made a 4 layer board layout a 100khx esr meter design  (Read 2501 times)
0 Members and 1 Guest are viewing this topic.
sphinx
Hero Member
*****
Offline Offline

Posts: 899

Thank You
-Given: 604
-Receive: 260



« 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
Logged

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
Senior Member
****
Offline Offline

Posts: 295

Thank You
-Given: 4135
-Receive: 89


« 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
Logged
sphinx
Hero Member
*****
Offline Offline

Posts: 899

Thank You
-Given: 604
-Receive: 260



« 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

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
digitalmg
Junior Member
**
Offline Offline

Posts: 96

Thank You
-Given: 136
-Receive: 109


« 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. 
Logged
Sideshow Bob
Cracking Team
Hero Member
****
Offline Offline

Posts: 972

Thank You
-Given: 230
-Receive: 959



« 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. 
Logged

I have come here to chew bubblegum and kick ass... and I'm all out of bubblegum
bigtoy
Active Member
***
Offline Offline

Posts: 238

Thank You
-Given: 320
-Receive: 297


« 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.
Logged
sphinx
Hero Member
*****
Offline Offline

Posts: 899

Thank You
-Given: 604
-Receive: 260



« 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
Logged

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
Pages: [1]
Print
Jump to:  


DISCLAIMER
WE DONT HOST ANY ILLEGAL FILES ON THE SERVER
USE CONTACT US TO REPORT ILLEGAL FILES
ADMINISTRATORS CANNOT BE HELD RESPONSIBLE FOR USERS POSTS AND LINKS

... Copyright © 2003-2999 Sonsivri.to ...
Powered by SMF 1.1.18 | SMF © 2006-2009, Simple Machines LLC | HarzeM Dilber MC