Re: gEDA-user: pcb DRC

[kai-martin knaak <kmk@xxxxxxxxxxxxxxx>]

gene glick wrote:

> Some recent work at my day job involved 400 MHz opamps.  These things
> require careful layout to keep from oscillating, just as you say.

At my day-job we almost automatically choose MMIC amplifiers whenever 
amplification at frequencies beyond 100 MHz is required. Some of these 
little critters come with a data sheet saying "unconditionally stable" :-)

Two weeks ago, a PHD student managed to detect 6.2 GHz with a Photo diode 
amplified by the fastest MMIC we could get from Farnell. The signal was 
produced by the beat note of two spectroscopically stabilized lasers. So she 
knew for sure, that the desired frequency was present. There was nothing 
special about the two layer layout. Just all HF components as close as 
possible and as much GND as would fit. In particular, no realistic 3D 
modeling and simulation of the fields was done. Still, it worked. :^)

---<(kaimartin)>---
-- 
Kai-Martin Knaak
Ãffentlicher PGP-SchlÃssel:
http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x6C0B9F53



_______________________________________________
geda-user mailing list
geda-user@xxxxxxxxxxxxxx
http://www.seul.org/cgi-bin/mailman/listinfo/geda-user