RE: [SI-LIST] : 2 mil Core ?! Can I use it ?

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From: Thomas Jackson (tjackson@fmi.fujitsu.com)
Date: Mon Jan 15 2001 - 11:47:55 PST


Ahmed,

I don't know what a cost adder 2-mil cores have. The most important thing
is to find a PCB fabricator that has some experience with these thin
dielectrics, like Hadco for one. I have a special case. I only deal with
evaluation boards used to test VLSI devices. They are only produced in
small quantities, so they have different costs. Performance is more of an
issue than cost for these boards.

It wasn't that I was able to reduce the number of high frequency decoupling
caps. More important to me, the board produced over 2000 pF of capacitance
for both the analog and digital power domains at frequencies above those
where the discrete capacitors ceased to be capacitive.
-----Original Message-----
From: Alokby, Ahmed [mailto:ahmed.alokby@intel.com]
Sent: Monday, January 15, 2001 11:23 AM
To: 'Thomas Jackson'; 'Aric Hadav'; 'si-list@silab.eng.sun.com'
Subject: RE: [SI-LIST] : 2 mil Core ?! Can I use it ?

Tom,
How much of a cost adder was using 2 mills core as oppose to 4 mills? Did
you achieve significant reduction in high frequency decoupling caps due to
the increased plane capacitance

Ahmed Alokby

-----Original Message-----
From: Thomas Jackson [mailto:tjackson@fmi.fujitsu.com]
Sent: Monday, January 15, 2001 8:51 AM
To: 'Aric Hadav'; 'si-list@silab.eng.sun.com'
Subject: RE: [SI-LIST] : 2 mil Core ?! Can I use it ?

I have used 2-mil core with 2 oz copper on each side for a set of boards. I
had good results. In my application, the 2-mil cores were to separate power
and ground planes.

Tom

Thomas L. Jackson, P.E.
Staff VLSI Design Engineer
Network Access Development
Systems Solutions Group
FUJITSU MICROELECTRONICS, INC.
3545 North First Street
San Jose, CA 95134-1804
telephone: (408) 922-9574
facsimile: (408) 922-9618
http://www.fujitsumicro.com

-----Original Message-----
From: Aric Hadav [mailto:Aric@accord.co.il]
Sent: Monday, January 15, 2001 6:53 AM
To: 'si-list@silab.eng.sun.com'
Subject: [SI-LIST] : 2 mil Core ?! Can I use it ?

Hi,

I designed a high density PCB with tight restrictions on its width.
my PCB manufacturer asks if I can use a 2 mil core with 0.5 oz copper on
each side and
by using it, I'll be able to expand prepreg layers in the board.

my question is, has anyone have experience with 2 mil core size ?

thanks,

        Aric Hadav
        Hardware Design Engineer

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