[SI-LIST] Re: Optimal Power/ground lauout for a 2-layer PCB
- From: "Nagel, Michael" <Michael.Nagel@xxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Wed, 6 Feb 2002 11:23:47 +0100
Adeel,
Your task does not fit into my definition of fun ...
Here my 2 cents:
1. The most sensible thing in my eyes is to separate analog and digital +5V
already at the connector and to run the analog voltage through a ferrite
bead or even a more elaborate filter depending on the application.
2. The required value is a typical one I know from neigboured VCC/GND planes
in multilayer PCBs with thin substrates and a couple of holes because of
vias. I do not have any simulations on that. Maybe somebody else will
turn
up with the right values? Running a 2-layer PCB on that kind of frequency
is not a sensible thing in my eyes ...
Hope the people charging you with this task will have a second thought on
the
specifications.
Best regards,
Michael
Again - just my 2 cents :)
-----Original Message-----
From: Adeel Malik [mailto:AdeelM@xxxxxxxxxxxx]
Sent: Mittwoch, 6. Februar 2002 10:47
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Optimal Power/ground lauout for a 2-layer PCB
Hi All,
I have a task to design a 2-layer board with a very packed
circuitry and so, no luxury of having the ground or power planes. The power
supplies provided to the board are +5V, -24V and -48V, through a DIN-96
connector.
I have two questions:
1. Digital components would be fed directly from +5V supply whereas I have
to generate +5V Analog (for Analog ICs) from +5V supply. How should I do
that so that transients at +5V due to digital IC's are not coupled to +5V
Analog ?.
2. Secondly, I require the impedance of power tracks not more than 0.1 Ohms
at frequencies upto 50MHz. What should be the optimum dimensions of these
tracks (+5V and its ground) ?.
Also I 'ld appreciate if someone can guide me to an Application/Design note
describing power/ground layout on a double-layer PCB for a multiple-supply
instrument.
I' ld be thankful to your response,
Regards,
Adeel Malik,
Senior Design Engineer,
Communications Enabling Technologies,
5-A Constitution Avenue,
Islamabad, Pakistan.
Tel: 92-51-2826160
Fax: 92-51-2827469
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