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and EMI (electromagnetic interference)
Submitted by John Artiuch on September 20, 2008. Pcb cad EMI
PCB PCB layout printed circuit board
To have a smart PCB layout that controls or eliminates any electromagnetic
interference (EMI)and noise is the most important aspects of
a good reliable design.
This is especially important in multi layer PCB designs. A noisy
system can lead to unpredictable logic and phase-locked loop
failures that reduce overall reliability, as well there is potential
that the device will not pass government standards for EMI.A
Printed Circuit Board (PCB) design for Mel Bartels' Alt/Az drive
system
NOTE 1:
This PCB Layout does NOT include the new added feature of field
rotation! For a description of my fieldrotation daughterboard
go to my Fieldrotation page.
NOTE 2:
Many people asked me to sell them one of my circuit boards.
I do NOT manufacture or sell those boards! It is actually quite
easy to make them. I however will be happy to answer any question
about the process of building one.
NOTE 3:
Neither PCB's manufactured using my design nor the design itself
may be sold. The use of the content of this page for any kind
of publication needs the agreement of Mel Bartel's and myself.
Also see my CompuDob page that displays my 6" Computerized
Dobsonian telescope
© WebRing Inc. scope drive
<< Prev | Ring Hub | Join | Rate| Next >>
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Preface
I assume that the reader is familiar with the basic process
of etching printed circuit boards. If not, I recommend to
look through the reference section at the end of this page.
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Layout
Download the 120k ZIP file with the Postscript/Acrobat files
and unpack it to a directory on your hard disk.
The archive contains the following files:
ARTWORK.PS / ARTWORK.PDF
The main sources of noise in embedded systems come from switching
power supplies, common mode current, noisy ground islands,
high frequency switching signals, oscillators, phase-locked
loop circuits, crosstalk between signals, the transmission
line effect, and from hardware sources like disk drives. For
example, when two high frequency signal lines are close together
they can couple due to their capacitances and mutual inductance.
Signal lines can effectively act like The reader has to take
all necessary safety precautions while handling the chemicals
for PCB etching!
Those include: Rubber Gloves, glasses to protect the eyes,
apron, suitable and well-ventilated working area.
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Materials needed
One single sided copper clad board 180x130 mm
Iron-on toner transfer foil/paper or laser printer transparencies
Postscript capable Laser printer or Xerox copy machine
Etchant (Ferric chloride)
Scotch brit cleaning sponge for cleaning the board
Etch resistant pen (Decon) for touching up badly transferred
traces
Electric Iron
You can also expose the artwork on the board. In that case
you will need a photosensitized copper board and all the chemicals
to develop the board.
antennas emitting electromagnetic waves. Decoupling capacitors
of the power and ground planes can be used to short circuit
or filter noise, however this only works to a certain frequency.
High frequencies are a lot trickier to deal with and require
more advanced filters to stop noise from affecting adjacent
circuits.
A good PCB layout which considers current paths, return loops
as well the physical location of certain components relative
to one another can dramatically reduce noise and radiation.
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