On Tue, 2010-03-02 at 21:21 -0800, Donald Tillman wrote: > On Mar 2, 2010, at 2:35 AM, Peter TB Brett wrote: > > > The usual approach is to buy SMT packages containing 2 or 4 > > transistors on > > a single piece of silicon (i.e. literally back-to-back on the wafer). > > They're invariably well-matched enough for all but the most ultra- > > precise > > applications, in my experience. > > > Which dual/quad transistors are these? Who makes them? > > (And back-to-back? Are you sure? That doesn't sound right. That > would have to involve separate processes for each side, and so the > transistors wouldn't be matched.) > > Most dual transistors I've seen have the transistors on separate > dies. And so there's no matching and no offset spec; it's just like > picking up 2 or 4 individual transistors. > > -- Don > > -- > Don Tillman > Palo Alto, California > [email protected] > http://www.till.com > > > > > > > _______________________________________________ > geda-user mailing list > [email protected] > http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
...me thinks Pete had a long-tail-pair schematic in his head at the time. Probably meant side-by-side on the die. -- Greg _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
