[SI-LIST] Re: Embedded elements in PCBs
- From: steve weir <weirsi@xxxxxxxxxx>
- To: Mohamad Haghtalab <mohaghtalab@xxxxxxxxx>
- Date: Tue, 26 Aug 2008 01:41:29 -0700
Mohamed it depends on how much money you have and are willing to trade
for manual effort. There are advanced versions of PCB layout tools that
help automate some of the design tasks. They don't come cheap.
With a certain amount of manual effort you can design these elements
using lower cost tools and then work those results into your PCB design
database. For example many simple rectangular R, L, or C, elements may
be designed to reasonable precision with nothing more than a hand
calculator or spreadsheet. A 2D or 2.5D field solver will get you
closer on the Ls and Cs, and is highly recommended if you are going to
do anything fancy like a spiral inductor with any accuracy.
If you are contemplating embedded resistors or capacitors you will want
to understand the costs, processing, and trade-offs. In particular, you
will want to know which PCB fab houses support the products you are
interested in, what yields look like and what kinds of costs are
involved. There are multiple material players for both embedded
resistor clads and embedded capacitance laminates. You will want to
contact the players and understand the design considerations for each
product offering and your fabrication options. The manufacturers have a
number of published papers and design guides that they publish. Also,
Istvan has done a lot of work on the thin and hi K laminates for power
delivery and you can grab papers off his site.
Embedded resistance clad suppliers:
Ohmega Ohmega Ply(r) NiP based materials
Ticer TCR(r) NiCr based materials
Embedded capacitance laminate suppliers:
3M, C-Ply(r), BaTiO3 loaded thin epoxy dielectric
DuPont, HK04(r), Unloaded polyimide based thin dielectrics
Oak-Mitsui, Faradflex(r), BATiO3 loaded, and unloaded epoxy based
dielectrics
If you are out to reduce discrete caps, more than capacitance in the
planes, reduced spreading inductance is what is going to allow removal
of bypass caps from a well executed design using thin laminates. There
are benefits to be had from loaded dielectrics, but it is a lot more
complicated than simple discrete bypass capacitor removal.
Steve.
Mohamad Haghtalab wrote:
> Hi all
>
> How can we develope embedded elements(resistor,capacitor,inductor....)
> shaping traces in PCB?
>
>
>
>
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