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Jim Thompson

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See "ICE-LM195-LM117.pdf" on the S.E.D/Schematics page of my website.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
 
Jim Thompson wrote...
See "ICE-LM195-LM117.pdf" on the S.E.D/Schematics page of my website.
Click to expand...
Very nice. Was there ever a 2nd source for the LM195 / LM395?

Thanks,
- Win

whill_at_picovolt-dot-com
 
On 31 Jan 2004 10:59:19 -0800, Winfield Hill
<Winfield_member@newsguy.com> wrote:

Jim Thompson wrote...

See "ICE-LM195-LM117.pdf" on the S.E.D/Schematics page of my website.

Very nice. Was there ever a 2nd source for the LM195 / LM395?

Thanks,
- Win

whill_at_picovolt-dot-com
Click to expand...
Not that I know of.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
 
Jim Thompson wrote...
See "ICE-LM195-LM117.pdf" on the S.E.D/Schematics page of my website.
Click to expand...
There are a number of interesting things in the die photo, figure 4.

For example, the 45V zener is made from seven Veb transistor zeners
in series. Q9 is larger, befitting its higher mirror current. And
the Q17 Q18 transistor island is smaller, despite its PNP carrying
higher currents. (Q18 enhances the output base-current drive when Q19
sees high currents. Widlar described this in his LM12 design article,
AN-446B. Hans Camenzind wrote about the scheme's stability issues
when describing his enhanced low-voltage zsct1555 design for Zetex.)

One of the Q20 power collector connections is right in the middle of
the die, is that very common? C1 is a giant 30pF part, is it really
necessary?

Thanks,
- Win

whill_at_picovolt-dot-com
 
On 31 Jan 2004 13:09:35 -0800, Winfield Hill
<Winfield_member@newsguy.com> wrote:

Jim Thompson wrote...

See "ICE-LM195-LM117.pdf" on the S.E.D/Schematics page of my website.

There are a number of interesting things in the die photo, figure 4.

For example, the 45V zener is made from seven Veb transistor zeners
in series. Q9 is larger, befitting its higher mirror current. And
the Q17 Q18 transistor island is smaller, despite its PNP carrying
higher currents. (Q18 enhances the output base-current drive when Q19
sees high currents. Widlar described this in his LM12 design article,
AN-446B. Hans Camenzind wrote about the scheme's stability issues
when describing his enhanced low-voltage zsct1555 design for Zetex.)

One of the Q20 power collector connections is right in the middle of
the die, is that very common? C1 is a giant 30pF part, is it really
necessary?

Thanks,
- Win

whill_at_picovolt-dot-com
Click to expand...
30pF is not an uncommon compensating capacitor value.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
 
On Fri, 30 Jan 2004 10:04:44 -0700, Jim Thompson
<thegreatone@example.com> wrote:

See "ICE-LM195-LM117.pdf" on the S.E.D/Schematics page of my website.

...Jim Thompson
Click to expand...

Is ICE still around? They used to do cool "teardown" analysis of ICs,
which they published in multi-kilobuck, very slick booklets with neat
color chip photos and discussions. Somebody, a rep I think, snuck me a
few once.

John
 
On Sat, 31 Jan 2004 16:01:47 -0800, John Larkin
<jjlarkin@highlandSNIPtechTHISnologyPLEASE.com> wrote:

On Fri, 30 Jan 2004 10:04:44 -0700, Jim Thompson
thegreatone@example.com> wrote:

See "ICE-LM195-LM117.pdf" on the S.E.D/Schematics page of my website.

...Jim Thompson


Is ICE still around? They used to do cool "teardown" analysis of ICs,
which they published in multi-kilobuck, very slick booklets with neat
color chip photos and discussions. Somebody, a rep I think, snuck me a
few once.

John
Click to expand...
They're pretty much out of the technical consulting business, opting
instead to do "business" consulting... how to fund your own foundry
and other such useless drivel ;-) I think they were acquired by
Chipworks.

I wrote and presented a bunch of their analog seminars from about
1965-1985, and was involved with a lot of "tear-down" and patent
infringement analysis until about 1995. The LM195/LM117 stuff I just
posted was an example of "tear-down". The report also included
process analysis... bevel and stain (junctions) and all that good
stuff.

Glen Madland and Howard Dicken haven't been active in the company in
quite a while. They left Motorola in 1965 and hired me on-the-side.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
 
In article <sfgo10ll1pfbaa6daf45aq7dgki1h6dkgo@4ax.com>,
Jim Thompson <thegreatone@example.com> wrote:


I wrote and presented a bunch of their analog seminars from about
1965-1985, and was involved with a lot of "tear-down" and patent
infringement analysis until about 1995. The LM195/LM117 stuff I just
posted was an example of "tear-down". The report also included
process analysis... bevel and stain (junctions) and all that good
stuff.
Click to expand...
I attended one of their seminars in NYC either in the late '70s or early
'80s. Good stuff, when it was possible for a reasonably sized company to
have their own failure analysis lab. and be able to perform many of the
procedures by hand with simple fixtures and tools. When I started asking
for ion beam etchers, my company said, "Forget about it!" My most modern
tools were a SEM, computer controlled die probe and a Jupiter Plasma
etcher.

Al

--
There's never enough time to do it right the first time.......
 
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