| Author |
Message |
Richard Henry
Guest
|
 Posted:
Tue Nov 22, 2005 5:35 pm Post subject:
Re: Analog RAM and D-FilpFlop? |
|
|
"Jim Thompson" <To-Email-Use-The-Envelope-Icon@My-Web-Site.com> wrote in
message news:m1c6o1dku3cha0tm5mis1cte17fg23gskm@4ax.com...
| Quote: | On Tue, 22 Nov 2005 06:07:03 +0000, Pooh Bear
rabbitsfriendsandrelations@hotmail.com> wrote:
John Larkin wrote:
On Tue, 22 Nov 2005 01:03:10 +0000, Pooh Bear
[snip]
On a more modern note, Intersil is making some very nice voltage
reference chips with no "reference" at all. They're essentially
silicon capacitors charged up to the desired voltage and buffered with
a cmos opamp. They factory calibrate them (by tunneling or something)
and ship! The voltage just hangs there sort of forever.
I was impressed.
http://www.intersil.com/data/fn/fn8142.pdf
John
That's astonishing !
Graham
Wonder if a strong electric field can upset them?
|
Or ionizing radiation.
|
|
| Back to top |
|
 |
Jim Thompson
Guest
|
| Posted:
Tue Nov 22, 2005 5:35 pm Post subject:
Re: Analog RAM and D-FilpFlop? |
|
|
On Tue, 22 Nov 2005 06:07:03 +0000, Pooh Bear
<rabbitsfriendsandrelations@hotmail.com> wrote:
| Quote: |
John Larkin wrote:
On Tue, 22 Nov 2005 01:03:10 +0000, Pooh Bear
[snip]
On a more modern note, Intersil is making some very nice voltage
reference chips with no "reference" at all. They're essentially
silicon capacitors charged up to the desired voltage and buffered with
a cmos opamp. They factory calibrate them (by tunneling or something)
and ship! The voltage just hangs there sort of forever.
I was impressed.
http://www.intersil.com/data/fn/fn8142.pdf
John
That's astonishing !
Graham
|
Wonder if a strong electric field can upset them?
...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. |
|
| Back to top |
|
|
Chris Jones
Guest
|
| Posted:
Thu Nov 24, 2005 1:35 am Post subject:
Re: Analog RAM and D-FilpFlop? |
|
|
John Larkin wrote:
| Quote: | On Tue, 22 Nov 2005 07:38:30 -0800, "Richard Henry" <rphenry@home.com
wrote:
Or ionizing radiation.
Sure. Xrays were used to erase the original eproms (three or four
times, then the silicon was destroyed.)
A rough calculation suggests the floating gate on the Intersil
reference leaks less than an electron per hour.
John
|
I wonder if you could use them as dosemeters. I don't have a source of
x-rays to test this possibility, but one of you guys might have an x-ray
machine for inspecting the soldering of BGAs. You could measure the
reference voltage with a good voltmeter before and after exposing the chip.
Chris
|
|
| Back to top |
|
|
John Larkin
Guest
|
| Posted:
Thu Nov 24, 2005 1:35 am Post subject:
Re: Analog RAM and D-FilpFlop? |
|
|
On Wed, 23 Nov 2005 20:19:58 +0000, Chris Jones
<lugnut808@nospam.yahoo.com> wrote:
| Quote: | John Larkin wrote:
On Tue, 22 Nov 2005 07:38:30 -0800, "Richard Henry" <rphenry@home.com
wrote:
Or ionizing radiation.
Sure. Xrays were used to erase the original eproms (three or four
times, then the silicon was destroyed.)
A rough calculation suggests the floating gate on the Intersil
reference leaks less than an electron per hour.
John
I wonder if you could use them as dosemeters. I don't have a source of
x-rays to test this possibility, but one of you guys might have an x-ray
machine for inspecting the soldering of BGAs. You could measure the
reference voltage with a good voltmeter before and after exposing the chip.
Chris
|
Yup, that should work. The classic old pen-type dosimiter was a
charged, bent fiber that straightened out as radiation removed the
charge. It had similar low leakage.
Another good project: use an EPROM as a super-high-resolution deep-UV
or xray imager.
John |
|
| Back to top |
|
|
|
|
|
|
FAQ
Memberlist
Register
Profile
Log in to check your private messages
Log in