EAGLE Netlist conversion

John Fields · Dec 4, 2004

Belief in things you can't see is silly.

---
My blindness doesn't prohibit the existence of what I can't see.
---

It's a misuse of the ability to believe.

---
Misuse of _my_ ability to believe in what I want to is to abandon my
ability to believe in what I want to because I've been told that I've
been using my ability to believe in what I want to in ways which
haven't been approved by the arbiter of what I should believe in and
what I shouldn't.

Thanks, but I'd prefer to go, as Oat Willie sez: "Onward, through the
fog".

--
John Fields

Robert Monsen · Dec 4, 2004

R. Steve Walz wrote:
[snipped]

Do you deny materialism? Or do you simply deny that we can figure out
material things given the clues we are given? Or, are you just yanking
our chain, playing the gadfly for the fun of it?

--
Regards,
Robert Monsen

"Your Highness, I have no need of this hypothesis."
- Pierre Laplace (1749-1827), to Napoleon,
on why his works on celestial mechanics make no mention of God.

Kevin Aylward · Dec 4, 2004

Active8 wrote:

That was a pretty good quicky Genome came up with for modeling the
supply current of an opamp - for the problem a hand. In case you
missed it, here it is:

|
| .-. I(D1)
+---------(--&gt-------------+
| '-' |
| D1 |
|\| +----->|--+ |
-|-\ | | ___ |
| >----+ +--|___|----+-----+
-|+/ | | | |
|/| | | | |
| +-----|<--+ | |
| D2 | ===
| .-. | GND
+---------(--&gt-------------+
| '-' I(D2)
|
created by Andy´s ASCII-Circuit v1.22.310103 Beta www.tech-chat.de

Works for modeling the current once the diode turns on but there's
bad crossover distortion.

Take the circuit from the "strange amp - MVC-324X.JPG - T600amp.jpg"
thread. Ok, don't take it. It's supposed to be an amp, not a switch.
So using the diodes to separate source and sink currents works, but
you get that distortion.

How can we model the supply current without the diode distortion?

Use u(t). Its an ideal comparator.

Put a Ov voltage source in the output lead. Use the current from this to
control current sources, with u(t), across the supplies. Don't forget to
add quiescent current.

Kevin Aylward
salesEXTRACT@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.

Helmut Sennewald · Dec 4, 2004

Von: "Kevin Aylward" <salesEXTRACT@anasoft.co.uk
Betreff: Re: Accurately models supply current?
Datum: Samstag, 4. Dezember 2004 12:44

Active8 wrote:
That was a pretty good quicky Genome came up with for modeling the
supply current of an opamp - for the problem a hand. In case you
missed it, here it is:

|
| .-. I(D1)
+---------(--&gt-------------+
| '-' |
| D1 |
|\| +----->|--+ |
-|-\ | | ___ |
| >----+ +--|___|----+-----+
-|+/ | | | |
|/| | | | |
| +-----|<--+ | |
| D2 | ===
| .-. | GND
+---------(--&gt-------------+
| '-' I(D2)
|
created by Andy´s ASCII-Circuit v1.22.310103 Beta www.tech-chat.de

Works for modeling the current once the diode turns on but there's
bad crossover distortion.

Take the circuit from the "strange amp - MVC-324X.JPG - T600amp.jpg"
thread. Ok, don't take it. It's supposed to be an amp, not a switch.
So using the diodes to separate source and sink currents works, but
you get that distortion.

How can we model the supply current without the diode distortion?

Use u(t). Its an ideal comparator.

Put a Ov voltage source in the output lead. Use the current from this to
control current sources, with u(t), across the supplies. Don't forget to
add quiescent current.

Kevin Aylward

Hello Kevin,
this is very similar to what I have implemented one year ago in example
circuits uploaded to the LTSPICE-Yahoo user group.

Hello Active8,
The other circuit with the diodes is a bad idea, because it adds a
lot of distortion to the original opamp behaviour.

The load current circuit with 0V-voltage source and two load current
sources can be downloaded from here. It also has a current source for
the quiescent current.

http://groups.yahoo.com/group/LTspice

Files > Lib > Opamp Load Curr. From Supplies

There are some examples there how to use it with LTSPICE. There is also a
nice symbol and a .SUBCKT model available in this folder.

Best Regards,
Helmut

LTSPICE is free and unlimited SPICE with graphical user interface.
www.linear.com LTSPICE/SwitcherCADIII

Fred Bartoli · Dec 4, 2004

"Active8" <reply2group@ndbbm.net> a écrit dans le message de
news:14ckm0bvjel43.dlg@news.individual.net...

That was a pretty good quicky Genome came up with for modeling the
supply current of an opamp - for the problem a hand. In case you
missed it, here it is:

|
| .-. I(D1)
+---------(--&gt-------------+
| '-' |
| D1 |
|\| +----->|--+ |
-|-\ | | ___ |
| >----+ +--|___|----+-----+
-|+/ | | | |
|/| | | | |
| +-----|<--+ | |
| D2 | ===
| .-. | GND
+---------(--&gt-------------+
| '-' I(D2)
|
created by Andy´s ASCII-Circuit v1.22.310103 Beta www.tech-chat.de

Works for modeling the current once the diode turns on but there's
bad crossover distortion.

Take the circuit from the "strange amp - MVC-324X.JPG - T600amp.jpg"
thread. Ok, don't take it. It's supposed to be an amp, not a switch.
So using the diodes to separate source and sink currents works, but
you get that distortion.

How can we model the supply current without the diode distortion?

Put a voltage source in series with each diode in order to have a small rest
bias current.
Also your diodes don't have to be real ones, then you can adjust their
parameters at will to give you the desired transition behaviour.

--
Thanks,
Fred.

Jim Thompson · Dec 4, 2004

On Sat, 4 Dec 2004 01:56:46 -0800, "Watson A.Name - \"Watt Sun, the
Dark Remover\"" <NOSPAM@dslextreme.com> wrote:

"Oppie" <oppie@-nospam-cloud9.net> wrote in message
news:10qt69o795rr82b@corp.supernews.com...
A little 'cow pie' humor, eh?

btw, why is a cow pie like a blonde?
The older they are, the easier they are to pick up.

But *why* would you ever want to pick up a cow pie???

[snip]

Where do you think the Frisbee concept came from ?

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

Watson A.Name - \"Watt Su · Dec 4, 2004

"Jim Thompson" <thegreatone@example.com> wrote in message
news:etp3r05glk35pvuum4plbnj11gg0vot2fb@4ax.com...

On Sat, 4 Dec 2004 01:56:46 -0800, "Watson A.Name - \"Watt Sun, the
Dark Remover\"" <NOSPAM@dslextreme.com> wrote:

"Oppie" <oppie@-nospam-cloud9.net> wrote in message
news:10qt69o795rr82b@corp.supernews.com...
A little 'cow pie' humor, eh?

btw, why is a cow pie like a blonde?
The older they are, the easier they are to pick up.

But *why* would you ever want to pick up a cow pie???

[snip]

Where do you think the Frisbee concept came from ?

...Jim Thompson
--

I thought is name was Hoo Flung Poo. [

Naw, I can't see pitching one of those, because it'd fly apart. And
catching one would be a totally splattering mess. But then I'm a city
slicker, not a farm boy, and I don't believe half of what they say.
http://www.farmerboys.com/ I mean, C'mon! If you think that's big, you
oughtta see the chicken that laid it!

Jim Thompson · Dec 4, 2004

On Sat, 4 Dec 2004 11:43:00 -0800, "Watson A.Name - \"Watt Sun, the
Dark Remover\"" <NOSPAM@dslextreme.com> wrote:

"Jim Thompson" <thegreatone@example.com> wrote in message
news:etp3r05glk35pvuum4plbnj11gg0vot2fb@4ax.com...
On Sat, 4 Dec 2004 01:56:46 -0800, "Watson A.Name - \"Watt Sun, the
Dark Remover\"" <NOSPAM@dslextreme.com> wrote:

"Oppie" <oppie@-nospam-cloud9.net> wrote in message
news:10qt69o795rr82b@corp.supernews.com...
A little 'cow pie' humor, eh?

btw, why is a cow pie like a blonde?
The older they are, the easier they are to pick up.

But *why* would you ever want to pick up a cow pie???

[snip]

Where do you think the Frisbee concept came from ?

...Jim Thompson
--

I thought is name was Hoo Flung Poo. [

Naw, I can't see pitching one of those, because it'd fly apart. And
catching one would be a totally splattering mess. But then I'm a city
slicker, not a farm boy, and I don't believe half of what they say.
http://www.farmerboys.com/ I mean, C'mon! If you think that's big, you
oughtta see the chicken that laid it!

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

Bill Sloman · Dec 4, 2004

Jim Thompson <thegreatone@example.com> wrote in message news:<8a54r01eearlrla9hmgm9tmjjt4eht083f@4ax.com>...

On Sat, 4 Dec 2004 11:43:00 -0800, "Watson A.Name - \"Watt Sun, the
Dark Remover\"" <NOSPAM@dslextreme.com> wrote:

"Jim Thompson" <thegreatone@example.com> wrote in message
news:etp3r05glk35pvuum4plbnj11gg0vot2fb@4ax.com...
On Sat, 4 Dec 2004 01:56:46 -0800, "Watson A.Name - \"Watt Sun, the
Dark Remover\"" <NOSPAM@dslextreme.com> wrote:

"Oppie" <oppie@-nospam-cloud9.net> wrote in message
news:10qt69o795rr82b@corp.supernews.com...
A little 'cow pie' humor, eh?

btw, why is a cow pie like a blonde?
The older they are, the easier they are to pick up.

But *why* would you ever want to pick up a cow pie???

[snip]

Where do you think the Frisbee concept came from ?

...Jim Thompson
--

I thought is name was Hoo Flung Poo. [

Naw, I can't see pitching one of those, because it'd fly apart. And
catching one would be a totally splattering mess. But then I'm a city
slicker, not a farm boy, and I don't believe half of what they say.
http://www.farmerboys.com/ I mean, C'mon! If you think that's big, you
oughtta see the chicken that laid it!

Naaaah! They dry up pretty sturdy... lot of straw content ;-)

Sure do. When I was a kid in Tasmania I got my face laid open by a
dried cow-pat that had been flung at me by another kid in the course
of some neighbourhood altercation - I think the flinger was as
surprised as I was by the effect, as we were pitching the cow pats at
one another over quite a distance, and none too accurately.

The wound bled quite profusely, but didn't need stitches, though I did
get an anti-tetanus injection. My parents were quite worried about
possible infection, but it healed up rapidly without leaving any scar.

-------
Bill Sloman, Nijmegen

Rich Grise · Dec 5, 2004

On Sat, 04 Dec 2004 14:33:15 -0800, Bill Sloman wrote:

Jim Thompson <thegreatone@example.com> wrote in message news:<8a54r01eearlrla9hmgm9tmjjt4eht083f@4ax.com>...
On Sat, 4 Dec 2004 11:43:00 -0800, "Watson A.Name - \"Watt Sun, the
Dark Remover\"" <NOSPAM@dslextreme.com> wrote:

"Jim Thompson" <thegreatone@example.com> wrote in message
news:etp3r05glk35pvuum4plbnj11gg0vot2fb@4ax.com...
On Sat, 4 Dec 2004 01:56:46 -0800, "Watson A.Name - \"Watt Sun, the
Dark Remover\"" <NOSPAM@dslextreme.com> wrote:

"Oppie" <oppie@-nospam-cloud9.net> wrote in message
news:10qt69o795rr82b@corp.supernews.com...
A little 'cow pie' humor, eh?

btw, why is a cow pie like a blonde?
The older they are, the easier they are to pick up.

But *why* would you ever want to pick up a cow pie???

[snip]

Where do you think the Frisbee concept came from ?

...Jim Thompson
--

I thought is name was Hoo Flung Poo. [

Naw, I can't see pitching one of those, because it'd fly apart. And
catching one would be a totally splattering mess. But then I'm a city
slicker, not a farm boy, and I don't believe half of what they say.
http://www.farmerboys.com/ I mean, C'mon! If you think that's big, you
oughtta see the chicken that laid it!

Naaaah! They dry up pretty sturdy... lot of straw content ;-)

Sure do. When I was a kid in Tasmania I got my face laid open by a
dried cow-pat that had been flung at me by another kid in the course
of some neighbourhood altercation - I think the flinger was as
surprised as I was by the effect, as we were pitching the cow pats at
one another over quite a distance, and none too accurately.

The wound bled quite profusely, but didn't need stitches, though I did
get an anti-tetanus injection. My parents were quite worried about
possible infection, but it healed up rapidly without leaving any scar.

It's actually probably one of the cleanest things you could get hit by
that's been picked up off the ground. The microbes that like to eat poop
don't like to infect wounds. Live flesh probably tastes bad to them. ;-)

I've heard from several different pieces of literature that maggots will
clean infection out of a sore, but not hurt live tissue. And I had a
GF once who worked as an MA for some Hollywood plastic surgeon, and she
reported that they actually do use live leeches to reduce bruising and
swelling. They're kept in special sterile leech-houses. She didn't say if
they fed them, or just left them hungry so that they'd go right to work. ;-)

Cheers!
Rich

Mark Jones · Dec 5, 2004

Active8 wrote:

That was a pretty good quicky Genome came up with for modeling the
supply current of an opamp - for the problem a hand. In case you
missed it, here it is:

|
| .-. I(D1)
+---------(--&gt-------------+
| '-' |
| D1 |
|\| +----->|--+ |
-|-\ | | ___ |
| >----+ +--|___|----+-----+
-|+/ | | | |
|/| | | | |
| +-----|<--+ | |
| D2 | ==> | .-. | GND
+---------(--&gt-------------+
| '-' I(D2)
|
created by Andy´s ASCII-Circuit v1.22.310103 Beta www.tech-chat.de

Works for modeling the current once the diode turns on but there's
bad crossover distortion.

Take the circuit from the "strange amp - MVC-324X.JPG - T600amp.jpg"
thread. Ok, don't take it. It's supposed to be an amp, not a switch.
So using the diodes to separate source and sink currents works, but
you get that distortion.

How can we model the supply current without the diode distortion?

Properly biased Zeners?

Robert Monsen · Dec 5, 2004

Blair P. Houghton wrote:

Robert Monsen <rcsurname@comcast.net> wrote:

According to Krugman, the traditional approach is to price your exports
based on the value of currency you are getting paid in.

Krugman is wrong.

Prices for foreign goods in America will go up.

Prices for foreign goods in other foreign nations will not.

America is losing its value.

--Blair
"Big picture."

I think he was just stating what's happened in the past.

However, Paul Krugman has been studying this for a while. He specializes
in exchange rates, and how they affected the economic catastrophes of
Russia and SE Asia. He won the John Bates Clark medal for best American
economist under 40, and teaches Economics at Princeton.

His recent oped columns in the NYT have been blistering attacks on the
Bush administration's economic failures and blatant lies. His current
book, entitled "The Great Unraveling: Losing our Way In the New Century"
is a compilation of some of those opeds, along with some more recent
analysis. If you are worried about the economy, and don't have much real
understanding of the issues (like me) it's a worthwhile read.

Suprisingly, until quite recently (oh, about 2000 or so

) he was
considered quite right-wing for his free market opinions. However, his
criticism of the first Bush tax cut led the adminstration to go after
him with a vengence. He was deemed "shrill" for pointing out that the
tax cut wouldn't help the job situation, or do anything except turn a
surplus into a deficit. However, he enjoys pointing out that he has
tenure, so what can they really do to him?

Here is the article I was citing:

http://www.econlib.org/library/Enc/ExchangeRates.html

--
Regards,
Robert Monsen

"Your Highness, I have no need of this hypothesis."
- Pierre Laplace (1749-1827), to Napoleon,
on why his works on celestial mechanics make no mention of God.

John Larkin · Dec 5, 2004

On Sun, 05 Dec 2004 04:37:35 GMT, Blair P. Houghton <b@p.h> wrote:

Robert Monsen <rcsurname@comcast.net> wrote:
According to Krugman, the traditional approach is to price your exports
based on the value of currency you are getting paid in.

Krugman is wrong.

Prices for foreign goods in America will go up.

Which will change Chinese goods from insanely cheap to merely very
cheap. Like instead of getting 12 hacksaw blades for 99 cents, I might
- horrors! - only get six.

And European cars and wine will be a lot less interesting.

Prices for foreign goods in other foreign nations will not.

Right. American products will be more affordable.

America is losing its value.

What really makes a country valuable is its productivity.

John

Genome · Dec 5, 2004

"Active8" <reply2group@ndbbm.net> wrote in message
news:14ckm0bvjel43.dlg@news.individual.net...

That was a pretty good quicky Genome came up with for modeling the
supply current of an opamp - for the problem a hand. In case you
missed it, here it is:

|
| .-. I(D1)
+---------(--&gt-------------+
| '-' |
| D1 |
|\| +----->|--+ |
-|-\ | | ___ |
| >----+ +--|___|----+-----+
-|+/ | | | |
|/| | | | |
| +-----|<--+ | |
| D2 | ===
| .-. | GND
+---------(--&gt-------------+
| '-' I(D2)
|
created by Andy´s ASCII-Circuit v1.22.310103 Beta www.tech-chat.de

Works for modeling the current once the diode turns on but there's
bad crossover distortion.

Take the circuit from the "strange amp - MVC-324X.JPG - T600amp.jpg"
thread. Ok, don't take it. It's supposed to be an amp, not a switch.
So using the diodes to separate source and sink currents works, but
you get that distortion.

How can we model the supply current without the diode distortion?
--
Best Regards,
Mike

In LTspice you can model an ideal diode as described in the help files

D. Diode

Symbol Names: DIODE, ZENER, SCHOTTKY, VARACTOR.

Syntax: Dnnn anode cathode <model> [area]
+ [off] [m=<val>]

Examples:

D1 SW OUT MyIdealDiode
..model MyIdealDiode D(Ron=.1 Roff=1Meg Vfwd=.4)

D2 SW OUT dio2
..model dio2 D(Is=1e-10)

A diode requires a .model card to specify its characteristics. There are
two types of diodes available. One is a conduction region-wise linear model
that yields a computationally light-weight representation of an idealized
diode. It has three linear regions of conduction: on, off and reverse
breakdown.

Below are the model parameters for this type of diode:

name parameter units default
-----------------------------------------------------------
Ron resistance in forward conduction Ohm 1.
Roff resistance when off Ohm 1/gmin
Vfwd forward threshold voltage V 0.
to enter conduction
Vrev reverse breakdown voltage V infin.
Rrev breakdown impedance Ohm Ron

This idealized model is used if any of Ron, Roff, Vfwd, Vrev or Rrev is
specified in the model.

so

..model DID D(Ron=1u)

Gives you a diode with zero forward drop, 1u forward resistance, infinite
breakdown etc

Don't know if Pspice can do this. Perhaps Jim can tell you if he is in the
mood.

DNA

Active8 · Dec 5, 2004

On Sat, 4 Dec 2004 15:59:11 +0100, Fred Bartoli wrote:

"Active8" <reply2group@ndbbm.net> a écrit dans le message de
news:14ckm0bvjel43.dlg@news.individual.net...

That was a pretty good quicky Genome came up with for modeling the
supply current of an opamp - for the problem a hand. In case you
missed it, here it is:

|
| .-. I(D1)
+---------(--&gt-------------+
| '-' |
| D1 |
|\| +----->|--+ |
-|-\ | | ___ |
| >----+ +--|___|----+-----+
-|+/ | | | |
|/| | | | |
| +-----|<--+ | |
| D2 | ===
| .-. | GND
+---------(--&gt-------------+
| '-' I(D2)
|
created by Andy´s ASCII-Circuit v1.22.310103 Beta www.tech-chat.de

Works for modeling the current once the diode turns on but there's
bad crossover distortion.

Take the circuit from the "strange amp - MVC-324X.JPG - T600amp.jpg"
thread. Ok, don't take it. It's supposed to be an amp, not a switch.
So using the diodes to separate source and sink currents works, but
you get that distortion.

How can we model the supply current without the diode distortion?

Put a voltage source in series with each diode in order to have a small rest
bias current.

That occured to me.

Also your diodes don't have to be real ones, then you can adjust their
parameters at will to give you the desired transition behaviour.

If I can make Vf zero - like adding an extra couple few diode drops
to cancel it which effects the same result as the voltage source you
suggest.
--
Best Regards,
Mike

Jim Thompson · Dec 5, 2004

On Sat, 4 Dec 2004 06:15:34 -0500, Active8 <reply2group@ndbbm.net>
wrote:

That was a pretty good quicky Genome came up with for modeling the
supply current of an opamp - for the problem a hand. In case you
missed it, here it is:

|
| .-. I(D1)
+---------(--&gt-------------+
| '-' |
| D1 |
|\| +----->|--+ |
-|-\ | | ___ |
| >----+ +--|___|----+-----+
-|+/ | | | |
|/| | | | |
| +-----|<--+ | |
| D2 | ===
| .-. | GND
+---------(--&gt-------------+
| '-' I(D2)
|
created by Andy´s ASCII-Circuit v1.22.310103 Beta www.tech-chat.de

Works for modeling the current once the diode turns on but there's
bad crossover distortion.

Take the circuit from the "strange amp - MVC-324X.JPG - T600amp.jpg"
thread. Ok, don't take it. It's supposed to be an amp, not a switch.
So using the diodes to separate source and sink currents works, but
you get that distortion.

How can we model the supply current without the diode distortion?

Like this:

V+
|
|nodeP .-. G1
+---------(--&gt

-------------+
| '-' |
| |
|\| |
-|-\ + | | | - |
| >---------||||||-----------)-----+
-|+/ | | | | |
|/| | \
| V1 0V | / LOAD
| | \
| .-. | |
+---------(<--)-------------+-----+
| '-' G2 |
|nodeN === GND
V- =

created by JimT's copy & paste v1.22.310103 Beta ;-)

G1 nodeP 0 Value = {(ABS(I(V1))+I(V1))/2}

G2 0 nodeN Value = {(ABS(I(V1))-I(V1))/2}

...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

mark thomas · Dec 5, 2004

The artist formerly known as John Larkin wrote:

| On Sun, 05 Dec 2004 04:35:24 GMT, Blair P. Houghton <b@p.h> wrote:
|
|| Spehro Pefhany <speffSNIP@interlogDOTyou.knowwhat> wrote:
||| On Wed, 01 Dec 2004 11:01:28 -0800, the renowned John Larkin
||| <jjlarkin@highSNIPlandTHIStechPLEASEnology.com> wrote:
|||| On Wed, 01 Dec 2004 05:45:52 GMT, Blair P. Houghton <b@p.h> wrote:
|||||
||||| Governments do go bankrupt.
|||||
||||
|||| But they can print all the money they need.
||||
|||| John
|||
||| And this is what the result looks like:
|||
||| http://quotes.ino.com/chart/?s=NYBOT_DXY0&v=dmax
||
|| Gets worse:
||
|| http://www.joelscoins.com/exhibger2.htm
||
|| --Blair
|| "Samsonite is gonna make a mint."
|
|
| Why is it that some people take such joy in the hope of misery?
|
| John

Ambrose Bierce, in ''The Devil's Dictionary,'' offered the following
definition: ''Happiness, n. An agreeable sensation arising from
contemplating the misery of another.''

http://www.nytimes.com/2004/06/20/magazine/20WWLN.html

--
MT

To reply directly, please take "your dick" out of my address.

Genome · Dec 5, 2004

"Jim Thompson" <thegreatone@example.com> wrote in message
news:s7c6r0502u4ar2ejbum0k3uskbqj46353d@4ax.com...

On Sat, 4 Dec 2004 06:15:34 -0500, Active8 <reply2group@ndbbm.net
wrote:

That was a pretty good quicky Genome came up with for modeling the
supply current of an opamp - for the problem a hand. In case you
missed it, here it is:

|
| .-. I(D1)
+---------(--&gt-------------+
| '-' |
| D1 |
|\| +----->|--+ |
-|-\ | | ___ |
| >----+ +--|___|----+-----+
-|+/ | | | |
|/| | | | |
| +-----|<--+ | |
| D2 | ===
| .-. | GND
+---------(--&gt-------------+
| '-' I(D2)
|
created by Andy´s ASCII-Circuit v1.22.310103 Beta www.tech-chat.de

Works for modeling the current once the diode turns on but there's
bad crossover distortion.

Take the circuit from the "strange amp - MVC-324X.JPG - T600amp.jpg"
thread. Ok, don't take it. It's supposed to be an amp, not a switch.
So using the diodes to separate source and sink currents works, but
you get that distortion.

How can we model the supply current without the diode distortion?

Like this:

V+
|
|nodeP .-. G1
+---------(--&gt-------------+
| '-' |
| |
|\| |
-|-\ + | | | - |
| >---------||||||-----------)-----+
-|+/ | | | | |
|/| | \
| V1 0V | / LOAD
| | \
| .-. | |
+---------(<--)-------------+-----+
| '-' G2 |
|nodeN === GND
V- =

created by JimT's copy & paste v1.22.310103 Beta ;-)

G1 nodeP 0 Value = {(ABS(I(V1))+I(V1))/2}

G2 0 nodeN Value = {(ABS(I(V1))-I(V1))/2}

...Jim Thompson

Oh yes, and you know that's wrong.

What's the way of implementing ideal diode models in Pspice?

Otherwise you have to write....

Begin G1,
G1 nodeP 0 Value select case MOD(I(V1))
Case MOD(I(V1))>0
G1.Value=I(V1)
Case MOD(I(V1))<0
G1.Value=0
Case Else
G1.Value=0
EndG1
Begin G2,
G2 0 NodeN Value select case MOD(I(V1))
Case MOD(I(V1))<0
G2.Value=I(V1)
Case MOD(I(V1))>0
G2.Value=0
Case Else
G2.Value=0
EndG2

Or some such stuff, assuming Spice will interprete it for you.

DNA

Jim Thompson · Dec 5, 2004

On Sun, 05 Dec 2004 17:30:46 GMT, "Genome" <ilike_spam@yahoo.co.uk>
wrote:

"Jim Thompson" <thegreatone@example.com> wrote in message
news:s7c6r0502u4ar2ejbum0k3uskbqj46353d@4ax.com...
On Sat, 4 Dec 2004 06:15:34 -0500, Active8 <reply2group@ndbbm.net
wrote:

That was a pretty good quicky Genome came up with for modeling the
supply current of an opamp - for the problem a hand. In case you
missed it, here it is:

|
| .-. I(D1)
+---------(--&gt-------------+
| '-' |
| D1 |
|\| +----->|--+ |
-|-\ | | ___ |
| >----+ +--|___|----+-----+
-|+/ | | | |
|/| | | | |
| +-----|<--+ | |
| D2 | ===
| .-. | GND
+---------(--&gt-------------+
| '-' I(D2)
|
created by Andy´s ASCII-Circuit v1.22.310103 Beta www.tech-chat.de

Works for modeling the current once the diode turns on but there's
bad crossover distortion.

Take the circuit from the "strange amp - MVC-324X.JPG - T600amp.jpg"
thread. Ok, don't take it. It's supposed to be an amp, not a switch.
So using the diodes to separate source and sink currents works, but
you get that distortion.

How can we model the supply current without the diode distortion?

Like this:

V+
|
|nodeP .-. G1
+---------(--&gt-------------+
| '-' |
| |
|\| |
-|-\ + | | | - |
| >---------||||||-----------)-----+
-|+/ | | | | |
|/| | \
| V1 0V | / LOAD
| | \
| .-. | |
+---------(<--)-------------+-----+
| '-' G2 |
|nodeN === GND
V- =

created by JimT's copy & paste v1.22.310103 Beta ;-)

G1 nodeP 0 Value = {(ABS(I(V1))+I(V1))/2}

G2 0 nodeN Value = {(ABS(I(V1))-I(V1))/2}

...Jim Thompson

Oh yes, and you know that's wrong.

What's the way of implementing ideal diode models in Pspice?

As above is one way. I guess you could tamper with the model
parameters, but why bother? You have to be careful with "ideal"... it
can give you great convergence heartburn.

Otherwise you have to write....

[snip C-crap :-]

Or some such stuff, assuming Spice will interprete it for you.

DNA

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

Terry Given · Dec 5, 2004

Rich Grise wrote:

On Wed, 01 Dec 2004 21:37:54 -0700, Jim Thompson wrote:

On Wed, 1 Dec 2004 22:08:56 -0500, "Oppie" <oppie@-nospam-cloud9.net
wrote:

A little 'cow pie' humor, eh?

btw, why is a cow pie like a blonde?
The older they are, the easier they are to pick up.

"Jim Thompson" <thegreatone@example.com> wrote in message
news:9hgmq053hrj8qmhsrgp1lc4gsjhfob9u8m@4ax.com...

Dan Rather's career is like a bare foot sliding thru a warm cow patty.

...Jim Thompson

ROTFLMAO!

What's brown, and sounds like a bell?

spoiler
v

v

v

v

v

v

DUNG!

We all miss Spike Milligan.

Cheers
Terry

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