Re: Alumina Substrate

Jeff Liebermann wrote:
On Mon, 02 Jun 2008 09:16:33 -0700, Joerg
<notthisjoergsch@xxxxxxxxxxxxxxxxxxxxx> wrote:

Probably still much cheaper than Rogers?

Every other manufacturer is cheaper than Rogers. Great product, but
awful pricing.

It ain't easy. OTOH I was involved in the design of lots of hybrids (not the cars...) in the late 80's and early 90's. Cost was remarkably low, and we did have numerous vias on each. One factory was particularly spooky. Only emergency lighting, everything was dim, all the machines humming, barely any personnel. It was almost frankensteinisch.

In about 1970, I was working for Alpha Electronics in Stanton CA. We
did hybrids for CTCSS tone boards and the first LED digital watches.
At first, we trimmed values using an S.S. White sand blaster. Later,
we built our own gas laser. Nobody had a clue what they were doing so
we proceded to duplicate every mistake possible. Full blast laser (10
watts) on a ceramic substrate resulted in a fragmentation bomb. No
air flow near the optics resulted in pitting the optics. The front
surface silvered mirrors got rotted by the CO2 turning to carbolic
acid. Burning a hole in the x-y table was standard practice. A good
time was had by all involved.


In Europe we never built our own. In a particularly difficult case we even had an engineer from the laser mfg in Oregon fly in.


Somehow hybrids fell from grace in the industry shortly thereafter. I still miss active laser trimming. You could do RF stuff that's nearly impossible today. The good old days. <sigh>

Surface mount killed hybrids. The big advantage I found in hybrids
was building circuits with resistors that would all track together. I
think (not sure) that less than 1ppm tracking over the entire mil spec
temp range was possible.




--
Regards, Joerg

http://www.analogconsultants.com/

"gmail" domain blocked because of excessive spam.
Use another domain or send PM.
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