J
John Larkin
Guest
On Tue, 13 Jan 2009 08:49:31 -0800 (PST), a7yvm109gf5d1@netzero.com
wrote:
John
wrote:
No mystery. The trace is too skinny.
John
J
Jim Thompson
Guest
On Mon, 12 Jan 2009 21:10:16 GMT, mzenier@eskimo.com (Mark Zenier)
wrote:
[snip]
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice
480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
Liberals are so cute. Dumb as a box of rocks, but cute.
wrote:
I've heard that reported elsewhere as well.
[snip]
Because it was really the leftist weenies who caused the problem ;-)
...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice
480)460-2350 Fax: Available upon request | Brass Rat || E-mail Icon at http://www.analog-innovations.com | 1962 |
Liberals are so cute. Dumb as a box of rocks, but cute.
C
Chris M. Thomasson
Guest
"Skybuck Flying" <BloodyShame@hotmail.com> wrote in message
news:b8618$496cbfb4$d5337e4d$25720@cache2.tilbu1.nb.home.nl...
news:b8618$496cbfb4$d5337e4d$25720@cache2.tilbu1.nb.home.nl...
Be sure to always wear your tin-foil hat.
J
John Larkin
Guest
On Tue, 13 Jan 2009 02:54:24 -0800, Gunner
<gunner@NOSPAM.lightspeed.net> wrote:
John
<gunner@NOSPAM.lightspeed.net> wrote:
Like the majority of leftists, Sloman is just plain mean.
John
J
J.A. Legris
Guest
On Jan 13, 11:42 am, Jan Panteltje <pNaonStpealm...@yahoo.com> wrote:
shown in the above link are multiple viruses.
--
Joe
Note: tobacco mosaic virus is rod-shaped. Those forked structures
shown in the above link are multiple viruses.
--
Joe
R
Rudy Velthuis
Guest
Chris M. Thomasson wrote:
screw loose. <g>
--
Rudy Velthuis http://rvelthuis.de
"Wise men make proverbs, but fools repeat them."
- Samuel Palmer (1805-80)
I was convinced a long time ago already: that Skybuck has more than one
screw loose. <g>
--
Rudy Velthuis http://rvelthuis.de
"Wise men make proverbs, but fools repeat them."
- Samuel Palmer (1805-80)
J
James Arthur
Guest
Bill Sloman wrote:
excess, but was thwarted by Republicans? Funny, that's not what
the New York Times reported.
They specifically said the Clinton Administration /was pressuring
Fannie Mae to make risky subprime loans./ And they said it was a
risky policy that could easily lead to a meltdown, requiring a
government "rescue."
Fannie Mae Eases Credit To Aid Mortgage Lending
By STEVEN A. HOLMES, Published: September 30, 1999
http://tinyurl.com/3k7rtf
Looks like you have that bass-ackwards Bill. Good thing
you kept it simple.
James Arthur
The Clinton Adminstration was trying to rein in the free market
excess, but was thwarted by Republicans? Funny, that's not what
the New York Times reported.
They specifically said the Clinton Administration /was pressuring
Fannie Mae to make risky subprime loans./ And they said it was a
risky policy that could easily lead to a meltdown, requiring a
government "rescue."
Fannie Mae Eases Credit To Aid Mortgage Lending
By STEVEN A. HOLMES, Published: September 30, 1999
http://tinyurl.com/3k7rtf
Looks like you have that bass-ackwards Bill. Good thing
you kept it simple.
James Arthur
Q
qrk
Guest
On Mon, 12 Jan 2009 15:30:30 -0800, Joerg
<notthisjoergsch@removethispacbell.net> wrote:
keyboard with the function keys on the left side of the keyboard, this
is a very efficient way of designing. SDT386+ and PCB386+ drivers have
been constantly upgraded over the past 12 years outside of Orcad.
The biggest improvement: you don't need a real DOS environment
anymore. SDT & PCB now run in a real window in W2k, XP, and supposedly
Vista. A team effort by two people created video drivers so SDT and
PCB make real Windows graphics calls. One guy wrote VESA drivers in
assembly and another guy recoded in C, then created the GDI drivers.
As for printing, all my schematics are printed out to PDF which makes
them searchable. My work colleague wrote a tricky batch file which
automatically resizes any size drawing to a paper space of your choice
using Ghostscript. I modified an Open Office font which creates text
that closely matches what you see on the screen. To print a schematic
file to PDF is one command line batch file.
If you like printing to laserjet printers, there are drivers available
to do that.
If you need a GIF drawing to paste the schematic in a document, there
are conversion tools available to do that or you can convert your PDF
to bit map.
Want to stack a bunch of pins on top of another? Composer has been
modified to allow that which is useful for FPGA parts with dozens of
power and ground pins. 27 ground pins only require one pin space on
the schematic.
All this can be found on
http://tech.groups.yahoo.com/group/OldDosOrcad/ . There are a bit over
300 members. The files section has new drivers and exe files to
support modern methods. Plus, there are a few dozen people who
actively use SDT and PCB on a daily basis which provide good
information on use and setup of old DOS Orcad.
If your customer wants Capture formated files, Capture imports SDT
files, and does a good job at it if its version 7 or newer.
SDT's back-end processing is so open that you can write your own
netlist formaters which we have done to support our PCB tools. The
intermediate ASCII netlist file that SDT spits out can be converted to
a netlist format of your liking.
---
Mark
<notthisjoergsch@removethispacbell.net> wrote:
I still use SDT386+ as my primary schematic tool. With macros and a
keyboard with the function keys on the left side of the keyboard, this
is a very efficient way of designing. SDT386+ and PCB386+ drivers have
been constantly upgraded over the past 12 years outside of Orcad.
The biggest improvement: you don't need a real DOS environment
anymore. SDT & PCB now run in a real window in W2k, XP, and supposedly
Vista. A team effort by two people created video drivers so SDT and
PCB make real Windows graphics calls. One guy wrote VESA drivers in
assembly and another guy recoded in C, then created the GDI drivers.
As for printing, all my schematics are printed out to PDF which makes
them searchable. My work colleague wrote a tricky batch file which
automatically resizes any size drawing to a paper space of your choice
using Ghostscript. I modified an Open Office font which creates text
that closely matches what you see on the screen. To print a schematic
file to PDF is one command line batch file.
If you like printing to laserjet printers, there are drivers available
to do that.
If you need a GIF drawing to paste the schematic in a document, there
are conversion tools available to do that or you can convert your PDF
to bit map.
Want to stack a bunch of pins on top of another? Composer has been
modified to allow that which is useful for FPGA parts with dozens of
power and ground pins. 27 ground pins only require one pin space on
the schematic.
All this can be found on
http://tech.groups.yahoo.com/group/OldDosOrcad/ . There are a bit over
300 members. The files section has new drivers and exe files to
support modern methods. Plus, there are a few dozen people who
actively use SDT and PCB on a daily basis which provide good
information on use and setup of old DOS Orcad.
If your customer wants Capture formated files, Capture imports SDT
files, and does a good job at it if its version 7 or newer.
SDT's back-end processing is so open that you can write your own
netlist formaters which we have done to support our PCB tools. The
intermediate ASCII netlist file that SDT spits out can be converted to
a netlist format of your liking.
---
Mark
J
James Arthur
Guest
James Arthur wrote:
doesn't make loans; they were intentionally /trying/ to get
banks to make subprime loans.
"By expanding the type of loans that it will buy, Fannie Mae
is hoping to spur banks to make more loans to people with
less-than-stellar credit ratings."
It was deliberate--more loans was the goal, policy, pressure,
lowered standards and government subsidies were the means.
James Arthur
I should clarify it's actually even worse. Fannie Mae itself
doesn't make loans; they were intentionally /trying/ to get
banks to make subprime loans.
"By expanding the type of loans that it will buy, Fannie Mae
is hoping to spur banks to make more loans to people with
less-than-stellar credit ratings."
It was deliberate--more loans was the goal, policy, pressure,
lowered standards and government subsidies were the means.
James Arthur
S
Skybuck Flying
Guest
Let's see who's the real nut in the world.
Where is Osama Bin Laden ?
Where are the Weapons Of Mass Destruction ?
How come they did get Sadam Hoessein but not Osama Bin Laden ?
What's that ?
What's that I hear you say: ?
"Because Osama Bin Laden outsmarted everybody".
AH YES !.
Symbolics is his game... to get more fame.
All can see what he wants to be.
A legend that's what he will be.
Deception is his key.
Looks like a bum but in reality his family is more rich than could possibly
be.
Terror is his game... to get more fame.
Shiver at his name for it is him to blame.
For the world is now in fear causing this surveliance smear.
Destruction of capitalism is his game... to get more fame.
Written is his name on the bills of shame !
Bye,
Skybuck.
Where is Osama Bin Laden ?
Where are the Weapons Of Mass Destruction ?
How come they did get Sadam Hoessein but not Osama Bin Laden ?
What's that ?
What's that I hear you say: ?
"Because Osama Bin Laden outsmarted everybody".
AH YES !.
Symbolics is his game... to get more fame.
All can see what he wants to be.
A legend that's what he will be.
Deception is his key.
Looks like a bum but in reality his family is more rich than could possibly
be.
Terror is his game... to get more fame.
Shiver at his name for it is him to blame.
For the world is now in fear causing this surveliance smear.
Destruction of capitalism is his game... to get more fame.
Written is his name on the bills of shame !
Bye,
Skybuck.
C
Chris M. Thomasson
Guest
"Skybuck Flying" <BloodyShame@hotmail.com> wrote in message
news:d8549$496cf778$d5337e4d$13995@cache2.tilbu1.nb.home.nl...
maintenance dose of Chlorpromazine again? What a shame.
news:d8549$496cf778$d5337e4d$13995@cache2.tilbu1.nb.home.nl...
Humm... Did your handlers let you get on the Internet without your
maintenance dose of Chlorpromazine again? What a shame.
K
krw
Guest
In article <2M6bl.57936$2w3.51866@newsfe19.iad>, no@spam.invalid
says...>
says...>
<Yawn> Another typical .nl'er heard from.
Guest
On Jan 12, 7:05 pm, pseide...@hotmail.com wrote:
degree generally look for a degree from an ABET accredited college or
university. DeVry is not accredited. See the following websites:
http://www.abet.org/schoolareaeac.asp#D
http://www.abet.org/Linked%20Documents-UPDATE/Presentations/AM07/Karim.pdf#search="DeVry"
The article in the 2nd website implies that Devry was accredited at
one time, was "unaccredited" and is up for re-accreditation in 2010.
Regards,
Jon
The short answer is "No". Employers that require an Engineering
degree generally look for a degree from an ABET accredited college or
university. DeVry is not accredited. See the following websites:
http://www.abet.org/schoolareaeac.asp#D
http://www.abet.org/Linked%20Documents-UPDATE/Presentations/AM07/Karim.pdf#search="DeVry"
The article in the 2nd website implies that Devry was accredited at
one time, was "unaccredited" and is up for re-accreditation in 2010.
Regards,
Jon
J
John Larkin
Guest
On Tue, 13 Jan 2009 12:30:13 -0800 (PST), a7yvm109gf5d1@netzero.com
wrote:
the underside.
still loss at frequency, which is not risetime.
Plugging in your numbers, it claims 51.8 ohms and 12 dB/m loss at 3
GHz. The loss number sounds unlikely; maybe they're ignoring skin
effect.
barely possible.
Are you sure the lab's risetime measurement is accurate? I'm guessing
your 150 ps with that skinny trace is real, but you never know. How
are they doing it?
Oh, why does the risetime matter? Does it have to be 50 ohms?
Or replace the trace with a piece of coax. Or fab a little
transmission line kluge board and glue it on top; that would be fun.
John
wrote:
Rip up a trace (heat it with a soldering iron and peel) and look at
the underside.
TXLINE does, but I don't know that I believe the numbers. And it's
still loss at frequency, which is not risetime.
Plugging in your numbers, it claims 51.8 ohms and 12 dB/m loss at 3
GHz. The loss number sounds unlikely; maybe they're ignoring skin
effect.
No.
That's the thing to do. Possibly slot out the plane on layer 2...
barely possible.
Are you sure the lab's risetime measurement is accurate? I'm guessing
your 150 ps with that skinny trace is real, but you never know. How
are they doing it?
Oh, why does the risetime matter? Does it have to be 50 ohms?
No, run and scream like a MAN.
Or replace the trace with a piece of coax. Or fab a little
transmission line kluge board and glue it on top; that would be fun.
John
Guest
x-no-archive
Sweep your PWB out to 20 GHz and see how much it rolls off at 20 GHz.
This problem may be easier to understand in the frequency domain
instead of the time domain.
Figure out how to reduce losses at 20 GHz, the other posters already
gave some clues.
Mark
50ps corresponds to about 20 GHz.
Sweep your PWB out to 20 GHz and see how much it rolls off at 20 GHz.
This problem may be easier to understand in the frequency domain
instead of the time domain.
Figure out how to reduce losses at 20 GHz, the other posters already
gave some clues.
Mark
Guest
what is "puff"?
Mark
E
Eeyore
Guest
Arumugham wrote:
J
John Larkin
Guest
On Tue, 13 Jan 2009 12:14:43 -0800 (PST), makolber@yahoo.com wrote:
GHz... depending on the system.
BW * Tr = 0.35 for a gaussian-response system, like the typical
oscilloscope. It's similar for a simple 1st order rolloff, like an RC.
John
A risetime of 50 ps corresponds to a system bandwidth of about 7.5
GHz... depending on the system.
BW * Tr = 0.35 for a gaussian-response system, like the typical
oscilloscope. It's similar for a simple 1st order rolloff, like an RC.
John
J
John Larkin
Guest
On Tue, 13 Jan 2009 12:17:07 -0800 (PST), makolber@yahoo.com wrote:
John
What is "google"?
John
Guest
On Jan 13, 12:10 pm, John Larkin
<jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
what it was done) showed that.
We were going for 90ps out of the line, which was acceptable for the
application, and I needed the trace width because of
1) density
2) stackup (hands are tied)
.... but we now measure 150ps and I confirmed that to be sure. This is
bad. We are over spec...
So I'll be attacking the problem in a few ways
1) Find out about the adhesion, how is it done? foil type, etc
2) The formulas often used for impedance are empirical approximations
and never give attenuation/inch,
3) Again with the soldermask, I never got a good answer to the
question of removing it: does it change anything? Most of our fast
circuits expose the microstrip to be gold plated. All RF boards I've
seen (eval boards for the chips, etc use this approach as well, but it
looks like hard gold which is a problem in itself)
4) Stackup (thicknesses) can't change since it would be a major re-
spin, so I'm trying to see if re-arranging ground planes will allow
wider traces and not screw up the rest of the design
5) Run away screaming like a girl.
<jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
Yes the initial simulation (which I now can't find to see who and with
what it was done) showed that.
We were going for 90ps out of the line, which was acceptable for the
application, and I needed the trace width because of
1) density
2) stackup (hands are tied)
.... but we now measure 150ps and I confirmed that to be sure. This is
bad. We are over spec...
So I'll be attacking the problem in a few ways
1) Find out about the adhesion, how is it done? foil type, etc
2) The formulas often used for impedance are empirical approximations
and never give attenuation/inch,
3) Again with the soldermask, I never got a good answer to the
question of removing it: does it change anything? Most of our fast
circuits expose the microstrip to be gold plated. All RF boards I've
seen (eval boards for the chips, etc use this approach as well, but it
looks like hard gold which is a problem in itself)
4) Stackup (thicknesses) can't change since it would be a major re-
spin, so I'm trying to see if re-arranging ground planes will allow
wider traces and not screw up the rest of the design
5) Run away screaming like a girl.