No. Didn't do 3046 or any TL/LMV, but I've literally done hundreds of
BandGaps over the years.
...Jim Thompson
The first integrated opamp I ever used was made by GE. It was all NPNs
and zener diodes inside, and it was noisy, slow, noisy, quirky, and
noisy. I wish I could remember the part number, and maybe find a
datasheet. GE used to make all sorts of fun stuff: reference
transistors, snap diodes, integrated back-to-back zeners, tunnel
diodes, UJTs and PUTs, unintended phototransistors.
Before that, we used to make our own opamps, a bunch of discretes with
a selected pair of NPNs shrink-tubed together in the front end. By
adjusting one collector resistor, you could tune the TC... below 1
uV/degC wasn't hard.
Don't really miss much of that: we'd build a rack-full system with
maybe a hundred equivalent gates and a few opamps; it would take
months to build and weeks to get to work. Now we do a board with a
million or so equivalent gates, 70 or so linear functions, whip it out
in six weeks, and bring it up in a few days.
John