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Make-Your-Own Bandgap Reference

J

Jim Thompson

Jan 1, 1970
0
For a simple-minded/make-your-own bandgap reference, see

"CA3046-BandGap.pdf"

on the S.E.D/Schematics page on my website.

...Jim Thompson
 
J

Jan Panteltje

Jan 1, 1970
0
For a simple-minded/make-your-own bandgap reference, see

"CA3046-BandGap.pdf"

on the S.E.D/Schematics page on my website.
Nice.
JP
 
J

Joerg

Jan 1, 1970
0
That sure is nice. The only fly in the ointment would be that the 3046
is now around 30c or so while the LMV431 costs half that and has it all
in there. But I always liked the 3046. Jim, since you designed so many
chips, did you do this one as well?

Regards, Joerg.
 
W

Winfield Hill

Jan 1, 1970
0
Joerg wrote...
That sure is nice. The only fly in the ointment would be that the 3046
is now around 30c or so while the LMV431 costs half that and has it all
in there. But I always liked the 3046. Jim, since you designed so many
chips, did you do this one as well?

The CA3096 was a more attractive chip to me, with three npn and
two pnp transistors. I used this RCA chip in the early 70s to
make a micropower (5uA) band-gap voltage reference, and we made
many hundreds of them, in deep-sea oceanographic instruments.

Thanks,
- Win

whill_at_picovolt-dot-com
 
J

Jim Thompson

Jan 1, 1970
0
That sure is nice. The only fly in the ointment would be that the 3046
is now around 30c or so while the LMV431 costs half that and has it all
in there. But I always liked the 3046. Jim, since you designed so many
chips, did you do this one as well?

Regards, Joerg.

No. Didn't do 3046 or any TL/LMV, but I've literally done hundreds of
BandGaps over the years.

...Jim Thompson
 
J

Jim Thompson

Jan 1, 1970
0
That sure is nice. The only fly in the ointment would be that the 3046
is now around 30c or so while the LMV431 costs half that and has it all
in there. But I always liked the 3046. Jim, since you designed so many
chips, did you do this one as well?

Regards, Joerg.

See "BandGap-RealSample.pdf" on the S.E.D/Schematics Page of my
website for a design that is in production.

...Jim Thompson
 
J

Jim Thompson

Jan 1, 1970
0
Jim,
What program do you use to create your schematics?

Regards,
Sal Brisindi
www.tuberadios.com
[snip]

PSpice Schematics... what originally shipped when PSpice was owned by
MicroSim. The word is that OrCAD is going to drop support at the next
PSpice release, at which time I will be dumping PSpice for an
up-and-coming PSpice look-alike.

...Jim Thompson
 
S

Sal Brisindi

Jan 1, 1970
0
Thanks Jim

Jim said:
Jim,
What program do you use to create your schematics?

Regards,
Sal Brisindi
www.tuberadios.com
[snip]

PSpice Schematics... what originally shipped when PSpice was owned by
MicroSim. The word is that OrCAD is going to drop support at the next
PSpice release, at which time I will be dumping PSpice for an
up-and-coming PSpice look-alike.

...Jim Thompson
 
W

Watson A.Name - \Watt Sun, the Dark Remover\

Jan 1, 1970
0
Jim Thompson said:
For a simple-minded/make-your-own bandgap reference, see

"CA3046-BandGap.pdf"

on the S.E.D/Schematics page on my website.

...Jim Thompson
--

Presumably the CA3046 is used because the three transistors are all on
the same chip and they are matched and thermal drift is the same for all
three. But how much degradation would there be with three discrete
transistors? Seems like everything today has changed from the old dual
transistors or arrays to a single chip solution. Nothing wrong with the
old way, but I'd guess that performance is better with the all-in-one
single chip.
 
W

Watson A.Name - \Watt Sun, the Dark Remover\

Jan 1, 1970
0
Jim Thompson said:
Jim,
What program do you use to create your schematics?

Regards,
Sal Brisindi
www.tuberadios.com
[snip]

PSpice Schematics... what originally shipped when PSpice was owned by
MicroSim. The word is that OrCAD is going to drop support at the next
PSpice release, at which time I will be dumping PSpice for an
up-and-coming PSpice look-alike.

What's it cost?
 
J

Jim Thompson

Jan 1, 1970
0
Jim Thompson said:
Jim,
What program do you use to create your schematics?

Regards,
Sal Brisindi
www.tuberadios.com
[snip]

PSpice Schematics... what originally shipped when PSpice was owned by
MicroSim. The word is that OrCAD is going to drop support at the next
PSpice release, at which time I will be dumping PSpice for an
up-and-coming PSpice look-alike.

What's it cost?
[snip]

I can't say anything right now... it's still in Beta testing.

...Jim Thompson
 
J

Jim Thompson

Jan 1, 1970
0
Presumably the CA3046 is used because the three transistors are all on
the same chip and they are matched and thermal drift is the same for all
three. But how much degradation would there be with three discrete
transistors? Seems like everything today has changed from the old dual
transistors or arrays to a single chip solution. Nothing wrong with the
old way, but I'd guess that performance is better with the all-in-one
single chip.

That's why a TL431 or an LMV version is so good... thermal equilibrium
plus a full op-amp gain to force near-perfect balance.

...Jim Thompson
 
J

John Larkin

Jan 1, 1970
0
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
 
K

Klaus Vestergaard Kragelund

Jan 1, 1970
0
Jim Thompson said:
Jim Thompson said:
Jim,
What program do you use to create your schematics?

Regards,
Sal Brisindi
www.tuberadios.com

[snip]

PSpice Schematics... what originally shipped when PSpice was owned by
MicroSim. The word is that OrCAD is going to drop support at the next
PSpice release, at which time I will be dumping PSpice for an
up-and-coming PSpice look-alike.

What's it cost?
[snip]

I can't say anything right now... it's still in Beta testing.

We are using Orcad Capture Version 10 at work. I think it was something like
10k$ for a floating license

Cheers

Klaus
 
J

Jan Panteltje

Jan 1, 1970
0
We are using Orcad Capture Version 10 at work. I think it was something like
10k$ for a floating license

Cheers

Klaus
If you just want schematics in postscript, and no spice, in Linux xcircuit it
was called I think, does it 4 free.
JP
 
W

Watson A.Name \Watt Sun - the Dark Remover\

Jan 1, 1970
0
Jan said:
On a sunny day (Mon, 12 Apr 2004 13:04:33 +0200) it happened "Klaus
<[email protected]>:
If you just want schematics in postscript, and no spice, in Linux xcircuit it
was called I think, does it 4 free.
JP

Question is, does it compile and/or run under WIndoze? If not, then
forget it. Note: I didn't say anything was wrong with it, I just said
that no one will want to deal with it, since most people aren't using Linux.
 
J

Jan Panteltje

Jan 1, 1970
0
On a sunny day (Mon, 12 Apr 2004 16:14:15 -0700) it happened "Watson A.Name
forget it. Note: I didn't say anything was wrong with it, I just said
that no one will want to deal with it, since most people aren't using Linux.
Na, MS windows will soon be illegal here.
 
J

Jim Thompson

Jan 1, 1970
0
On a sunny day (Mon, 12 Apr 2004 16:14:15 -0700) it happened "Watson A.Name

Na, MS windows will soon be illegal here.

Your politicians can't be bribed ?:)

...Jim Thompson
 
W

Winfield Hill

Jan 1, 1970
0
Klaus Vestergaard Kragelund wrote...
We are using Orcad Capture Version 10 at work. I think
it was something like 10k$ for a floating license

What's a floating license?

Thanks,
- Win

whill_at_picovolt-dot-com
 
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