EAGLE Netlist conversion

John Hudak · Jun 8, 2005

As a starting point, I'd suggest looking for an application note (aka
App Note) that discusses analog comparators and their figures of merit.
The app notes generally have a short discussion on theory, then work
in the real world details (i.e. bw, current and voltage offsets due to
temp, noise effect, etc.) At least that way you will get an idea about
the parameters of importance. Get and review data sheets on some
low-end and high-end comparators and look at their test schematics to
see how they arrive at their performance parameters...apply the same (or
adapt as necessary) to test your ckt, and then write it up.
For starters, check National Semiconductor, TI, Analog Devices, Linear....
Good luck
John

Chris wrote:

There is no class,
Don't be rude.
Thats why I'm asking here about the standard methods for Analysis of a
Comparator.
If you give me a simple answer you could be of help.
Look I never had good access to classes as you might have had.
BTW I live in far East

Paul Rako · Jun 11, 2005

Turbocad--

from 90 bucks to 300 in various flavors is FAR superior
to Autocad and does everything Autocad does except all
the legacy LISP programs. It comes with symbol libraries
and can not only do nice 2-D drawings, it actual has a
3-d modeler that works pretty well too. After dropping
Autocad after release 14 I will never use that arcane
evil junk again.

Turbocad is far and away the best of the mechanical
cad clones-- Cadalyst magazine hipped me out to it
years ago and I have saved over 10k not upgrading
that evil autocad.

Paul

bill_hale@agilent.com wrote:

I was using IVEX. It was OK.

I'm looking for something to draw schematics, not
necessarily PC related.

The ideal program would handle wiring harnesses and connectors
& switches really well--from a library. It would be easy to label
stuff.

I don't need PCB layout. I might want to draw an occasional electronic
schematic, tho. I don't even need connectivity lists.

Should run on a PC

I would need several hundred nodes.

Price is not as important as ease of use and no screwy
behavior.

What do the intelligentsia think? Bill Hale

Ken Smith · Jun 11, 2005

In article <ZZsqe.2211$bv7.1037@newssvr21.news.prodigy.com>,
Paul Rako <s_p_mpa_u_l@yahoo.com> wrote:
[...]

Turbocad is far and away the best of the mechanical
cad clones-- Cadalyst magazine hipped me out to it
years ago and I have saved over 10k not upgrading
that evil autocad.

Turbocad is very good.

Intelicad was in the past also good but I haven't played with it in years.
Intelicad had the lisp built in so you didn't strand your old macros.

Qcad wins on the performance/cost ratio, but it only works on DXF files.
Qcad also seems to be able to handle a file on near infinite size without
trouble.

I expect very soon there will be an OpenOffice cad program. The OO Draw
program speaks in terms of DXF files and seems to be able to handle most
or all DXF constructs.

--
--
kensmith@rahul.net forging knowledge

Ken Smith · Jun 17, 2005

In article <55f4364e.0506121955.7609222d@posting.google.com>,
Tristan Beeline <mist_distance@hotmail.com> wrote:

I'm the new apprentice of the Empire and he told me to build a new
Death Star for the Empire.

I need to design it first and this time, it must be rebel-proof.

What do I need ?

Qcad and LTSpice both run Linux.

If you use a fast processor, there is no reason why the Laser blaster
targeting system couldn't properly track the rebel ships. Mathcad would
be good for running tests on your design equations.

You should also leave out the rows of flashing lights and not make your
electrical panels out of fireworks. Check out the UL rules for deathstar
design.

--
--
kensmith@rahul.net forging knowledge

Blastoff · Jun 18, 2005

Easy method is to search the net for a model
of the IBM Death Star aka deskstar harddrive and
use that as a outline

LOL..

JJ

R.Lewis · Jun 21, 2005

"kalel" <zert741@yahoo.fr> wrote in message
news:1119394770.166761.239610@g14g2000cwa.googlegroups.com...

Bonjour ,
VOILA UN MOYEN SIMPLE DE GAGNER 60 EUROS PAR MAIL LU
TOUT CE QUE VOUS AVEZ A FAIRE C EST DE VOUS INSCRIRE, PUIS VOUS ALLEZ
RECEVOIR DES MAILS QUI SI VOUS LES LISEZ VOUS FERONS GAGNER 60 EUROS .
C EST SIMPLE ET EFFICECE , PERSONNELLEMNT J AI DEJA GAGNER 6000 EUROS
EN 3 MOIS
TOUT CE PASSE ICI
tu dois clicker sur SIGN UP, puis tu recois un mail qui te demande de t
enregister . Apres tu commence directement a gagner de l argent
tu n a rien a perdre mais tt a y gagner

http://www.60euromail.com/pages/index.php?refid=kalel

I can read the German above but I can't understand it..
Can I get paid in dollars?

How much do I earn by participating in paid-emails?

Each advertiser pays a different amount per unique visit. These amounts
change frequently so we cannot give an exact amount for each visit,
however we do give you a large percentage of the amount we earn.( 60
euros at 100 euros per mails )
we will issue payment to you within 30 days

http://www.60euromail.com/pages/index.php?refid=kalel

Chuck Harris · Jun 21, 2005

R.Lewis wrote:

"kalel" <zert741@yahoo.fr> wrote in message
news:1119394770.166761.239610@g14g2000cwa.googlegroups.com...

Bonjour ,
VOILA UN MOYEN SIMPLE DE GAGNER 60 EUROS PAR MAIL LU
TOUT CE QUE VOUS AVEZ A FAIRE C EST DE VOUS INSCRIRE, PUIS VOUS ALLEZ
RECEVOIR DES MAILS QUI SI VOUS LES LISEZ VOUS FERONS GAGNER 60 EUROS .
C EST SIMPLE ET EFFICECE , PERSONNELLEMNT J AI DEJA GAGNER 6000 EUROS
EN 3 MOIS
TOUT CE PASSE ICI
tu dois clicker sur SIGN UP, puis tu recois un mail qui te demande de t
enregister . Apres tu commence directement a gagner de l argent
tu n a rien a perdre mais tt a y gagner

http://www.60euromail.com/pages/index.php?refid=kalel

I can read the German above but I can't understand it..
Can I get paid in dollars?

You silly American, that isn't German, it's Frog ;-)

-Chuck

Jim Thompson · Jun 22, 2005

On 21 Jun 2005 18:56:40 -0700, "philipcy99" <philipcy99@yahoo.co.uk>
wrote:

****************************************************************
Receive a FREE 20GB IPOD! as seen on BBC, CNN, NBC !!

Each person is entitled to a FREE 20GB IPOD at http://www.
freeipods.com/?r=19260535 ! No strings attached , it has been
broadcasted on notorious channels such as CNN, BBC and NBC and rated
as the best deal ever seen online!. The website also offers a whole
page of official recommendations.

All that you have to do is complete the signing up, and refer to 5
friends... and hey presto! A free ipod in the mail. There have been
over 16,000 sent.

****************************************************************
*To get this amazing offer as well as a special delivery deal, *copy
and paste this url : http://www.freeipods.com/?r=19260535
****************************************************************
* *
*For more information feel free to post here or email me at *
*philipcy99@yahoo.co.uk *
* *
*-Thanks for your time and enjoy your 20 gig ipod! *
***************************************************************

480)460-2350 | |
| E-mail Address at Website Fax

Slav Mit. · Jun 22, 2005

Hi! Just make Ref des visible (probably it is in Package Geometry class/
Silkscreen_Top or Silkscreen_Bot subclass.) -Then click 'move' button (Shift
F7) Uncheck all and check 'text' in the filter and move and rotate text. It
is indicated, which component it belongs to. Autosilk is used just to create
Gerber file and check it.Good luck!

<frb78@yahoo.com> wrote in message
news:1119385611.152279.113550@z14g2000cwz.googlegroups.com...

Hi all,
Is there someone who know how I can move reference designator on the
silkscreen with Cadence/Allegro 15.1? I try to place them to see it
well on the PCB when parts will be there. I only find "Auto Silkscreen"
and the placement is not as good as I want (different orientation, non
optimal placement, etc)

Thanks in advance!
Fred

Jonathan Westhues · Jun 23, 2005

"billcalley" <billcalley@yahoo.com> wrote in message
news:1119498271.379746.273860@g44g2000cwa.googlegroups.com...

'0'), shouldn't these results be the same as a DC transient
simulation with *no* UIC, since they should both have a initial
starting condition of 0V/0A? Yet with the simulation with no UIC

If UIC is not specified then SPICE does not assume zero initial conditions.
By default SPICE will solve for the DC operating point of the circuit before
performing a transient analysis, and use that for the initial conditions.

The originating message was also posted to sci.electronics.cad but was not
cross-posted, so I have cross-posted now.

Jonathan

Kevin Aylward · Jun 28, 2005

beta wrote:

Is there a way to match impedance for a circuit given typical input
and output stages of transistors for square wave (and other) types of
inputs?

Why? Here we go again. This matching impedance thing. Impedances, by and
large, in most circuits do not need to be "matched". In most cases, for
voltage amplifiers, the idea is have an output impedance < 1/10 of the
input of the following input impedance so as not to lose too much gain.

For a low noise bipolar design, the optimum noise is given by around
about re=Rs/sqrt(hfe), and since ri=hfe.re, one can argue that there is
a matching being done.

In some cases, one choses an impedance based on bandwidth. That is, if
there is a capacitive load shunting it wiyth a resistance will increase
the BW, at the expense of less gain.

Was wondering if there were such a function in spice type cad
simulators (e.g. orcad)

No.

that would compute the proper loads given
networks of R, C components, and later stages of transistors.

In most cases there is no such thing as a "proper load".

Part of
issue is that I'm not certain how to do it without spice utils, so it
maybe the cart before the horse situation. Thanks.

I don't think you understand the concept of input and output impedances,
and when one would want to "match" them or not. Spice isn't going to be
much help until you understand the theory behind it all. GIGO.

Kevin Aylward
informationEXTRACT@anasoft.co.uk
http://www.anasoft.co.uk
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.

Blastoff · Jun 29, 2005

Both of those programs are Bloat Ware.

The best remote administrator solution there is "is"
available here

http://www.famatech.com/

Get it , you will be glad you did.

It works very well via slower modem connections.

It also offers good security.

Regartds ... JJ

On Sun, 26 Jun 2005 12:01:28 -0700, Jim Thompson
<thegreatone@example.com> wrote:

pcanywhere versus gotomypc

Which is best? Reasons?

Thanks!

...Jim Thompson

Charles DH Williams · Jun 29, 2005

In article <1120013433.528740.237040@g43g2000cwa.googlegroups.com>,
"billcalley" <billcalley@yahoo.com> wrote:

In looking at MWO and ADS, it seems to me that most of the nonlinear
transistor models in their libraries are simply Spice models (either as
.model or .subckt files). Is this pretty much all harmonic balance
simulators use; or are there actually some true HB transistor models
out there?

What would you expect to be in a 'true HB transistor model' that is
not also accessible from the code comprising a full spice model?

Charles.

Jim Thompson · Jun 29, 2005

On Wed, 29 Jun 2005 00:36:01 -0400, Blastoff <none@nospam.net> wrote:

Both of those programs are Bloat Ware.

The best remote administrator solution there is "is"
available here

http://www.famatech.com/

Get it , you will be glad you did.

It works very well via slower modem connections.

It also offers good security.

Regartds ... JJ

480)460-2350 | |
| E-mail Address at Website Fax

Joerg · Jun 29, 2005

Hello Kevin,

Is there a way to match impedance for a circuit given typical input
and output stages of transistors for square wave (and other) types of
inputs?

Why? Here we go again. This matching impedance thing. Impedances, by and
large, in most circuits do not need to be "matched". In most cases, for
voltage amplifiers, the idea is have an output impedance < 1/10 of the
input of the following input impedance so as not to lose too much gain.

Agree. Thing is, this is often taught vaguely or even wrong at
universities. Once a professor was seriously saying that the output
impedance of a transmitter must be equal to the load impedance. I just
started day dreaming after that, imagining how all those big AM
transmitters would start to glow white hot.

Then I went back and showed him the design of one of my amps plus that
of a commercial one. "Ahem, well, errr ...."

For a low noise bipolar design, the optimum noise is given by around
about re=Rs/sqrt(hfe), and since ri=hfe.re, one can argue that there is
a matching being done.

Yes, that's about the only scenario where matching is a must to squish
out that last tenth of a dB in SNR.

Now we'd just have to teach the designers of, for example, TV buffer
amps or TV sets in general that there are a few other things that
matter. Such as dynamic range...

Regards, Joerg

http://www.analogconsultants.com

Blastoff · Jun 30, 2005

Good question Jim.

Most hotels dont block ports as long as a free port
is available the end user can access the remote pc.

In the case of a port block, since most people have a isp
they could dial their isp and connect that way.

I run a large network. I monitor many pc's remotely.
radmin is by far the best remote administration software
in a small byte size thats available today.

Works like a champ.. try the demo, you will bre hooked in no time
flat..

JJ

On Wed, 29 Jun 2005 07:54:28 -0700, Jim Thompson
<thegreatone@example.com> wrote:

On Wed, 29 Jun 2005 00:36:01 -0400, Blastoff <none@nospam.net> wrote:

Both of those programs are Bloat Ware.

The best remote administrator solution there is "is"
available here

http://www.famatech.com/

Get it , you will be glad you did.

It works very well via slower modem connections.

It also offers good security.

Regartds ... JJ

How does this sort of remote operation software handle the situation,
in many hotels, where the "connection" is only via a browser?

...Jim Thompson

Kevin Aylward · Jun 30, 2005

beta wrote:

Why?

Three reasons:
1. I have a low power design that I'm trying to develop, and think
matched impedances will provide most efficient results.

No it wont. Matched impedances waste half the power.

2. The simulation model shows this odd transient (dampened ringing)
that I suspect is due to mis-matched impedances, which are not seen
in the design reference circuit.

Matched impedances can be of value in obtaining correct waveforms when
driving transmission lines. That is when transmission line effects are
important, i.e. when the rise/fall times are faster than the turn around
delay time. Otherwise, matched resistances are, essentially irrelevant.

Of course, resister damping an inductor can prevent overshoot, but this
is not referred to as matching impedances.

3. Desire to understand basics of how to match them given source and
load situations/stages, how it translates into better design
performance, and what the manifestations/problems/characteristics are
of badly matched impedances.

As I said, in most case, matching impedances (RL=RS) is irrelevant. Its
the worse thing to do. Its throws away signal.

For #3 I have read that when designing a communications bus, for
example, mismatched impedance results in standing waves, and
reflections.

Yes. See above as to when these effects are important.

Although I am dealing with an analog design that has
nothing to do with a bus, clearly the importance of impedance matching
makes a big difference given these types of problems.

Only when that particular problem is of concern. When it isn't, and it
usefully isn't, matched impedances are poor design practise.

I realize this
is only anecdotal, and therefore not necessarily meaning anything
from a technical point of view.

If an analog circuit is cut in half with the left side viewed as an
output impedance and the right with an input impedance, my
understanding is the max power possibly transferred is -3 db. I
arrived at this by looking at some texts and thinking in terms of
voltage dividers.

Yes, but this point is, for the most part, useless information. For
example, an audio power amplifier is designed to have a low impedance
output, ideally, < 10 mohms. This is to obtain, in part, a flat
frequency reponse from the speaker. An output impedance equal to the
nominal sppeaker impedance, say, 4ohms, would have very large frequency
reponse errors.

The max *theoretical* power from a low impedance source , i.e. 50V at
10mohm would be huge. we don't care about the maximum available power in
*most* cases. Its just a number that has little relevance in most
analogue design. We care about voltage gain, *output* power and
efficiency etc.

The real design I have has a square wave input,
and the Fourier transform (I believe) is therefore infinite.

Real square waves are finite in their BW use.

So
matching the characteristics of the input transfer function to derive
an output transfer function such that -3 db is achieved is no trivial
accomplishment. I think that some simplification takes place when
trying to discover the optimal values of the R, L, C network to best
hit the -3 db target by neglecting the higher order terms. Again this
is all intuition, and I realize not a strong technical argument.
However I have several texts in front of me that I am reviewing
further.

For a low noise bipolar design, the optimum noise is given by around
about re=Rs/sqrt(hfe), and since ri=hfe.re, one can argue that there
is a matching being done.

What is re, Rs, if by hfe you mean DC Current Gain (or Small-Signal
Current Gain?). Also can you please elaborate on the meaning of
'ri=hfe.re'.
Thanks.

re is the intrinsic emiiter impedance that sets the gm of the device.

ic = gm.vi

That is, the small signal output current is given by gm times the small
signal input voltage.

gm = 40IC, where IC is the DC bias current.

ri is input resistance. Rs is the source resistance. hfe is the small
signal current gain.

Its all here
http://www.anasoft.co.uk/EE/bipolardesign1/bipolardesign1.html

Kevin Aylward
informationEXTRACT@anasoft.co.uk
http://www.anasoft.co.uk
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.

Joel Kolstad · Jun 30, 2005

Blastoff,

"Blastoff" <none@nospam.net> wrote in message
news:krp6c1lourfudjcmh74ajaqka1gna4nn1f@4ax.com...

The best remote administrator solution there is "is"
available here

http://www.famatech.com/

Can you comment on how it compares to the Windows XP Remote Desktop tool?

---Joel Kolstad

Jim Thompson · Jun 30, 2005

On 30 Jun 2005 14:35:37 -0700, "billcalley" <billcalley@yahoo.com>
wrote:

I'm kind of stuck on making a 50 ohm power source in Spice (instead
of just using the voltage or current sources). I would like to make a
50 ohm power source with a Pout of 0dBm. I realize I have to use the
Spice voltage source with a series 50 ohm resistor, but do I set the
voltage source to 632 mV or 316 mV in order to get a 0dBm Pout (in a
fifty ohm system)?

Thank You,

Bill

480)460-2350 | |
| E-mail Address at Website Fax

Paul Burke · Jul 1, 2005

Joel Kolstad wrote:

Can you comment on how it compares to the Windows XP Remote Desktop tool?

Is there a sort of reverse product, for stopping other people accessing
your computer, called gofrommywindows?

Paul Burke

EAGLE Netlist conversion

John Hudak

Guest

Paul Rako

Guest

Ken Smith

Guest

Ken Smith

Guest

Blastoff

Guest

R.Lewis

Guest

Chuck Harris

Guest

Jim Thompson

Guest

Slav Mit.

Guest

Jonathan Westhues

Guest

Kevin Aylward

Guest

Blastoff

Guest

Charles DH Williams

Guest

Jim Thompson

Guest

Joerg

Guest

Blastoff

Guest

Kevin Aylward

Guest

Joel Kolstad

Guest

Jim Thompson

Guest

Paul Burke

Guest

Log in

Welcome to EDABoard.com

Sponsor