1. Home
  2. Electronics Design
  3. LTSpice: Slow on noise sims with foreign opamps
  4. Page 2

LTSpice: Slow on noise sims with foreign opamps

You need to be careful while "sitching" ;-) ...Jim Thompson

--
| James E.Thompson, CTO                            |    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     | 
              
I love to cook with wine.     Sometimes I even put it in the food.
Reply to
Jim Thompson
Loading thread data ...

If you want to play with TI psrts perhaps try the free TI spice program "TINA"

--
?? 100% natural 

--- news://freenews.netfront.net/ - complaints: news@netfront.net ---
Reply to
Jasen Betts

Usually if spice is choking, there is something wrong with the circuit. Now you can't float single nodes in spice, but you can have nets that should be tied to something that might be floating.

I would look carefully at the connectivity of the subcircuit.

Reply to
miso

anymore)

input

guys.

degree

******************************************************************************

LTSpice.

Reply to
Joerg

Well, I don't want to learn a new CAD everytime a vendor thinks they absolutely have to boil their own proprietary broth. The stuff I do with it often gets to be complicated and that would take a long learning curve every time.

--
Regards, Joerg 

http://www.analogconsultants.com/
Reply to
Joerg

See...

formatting link
...Jim Thompson

--
| James E.Thompson, CTO                            |    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     | 
              
I love to cook with wine.     Sometimes I even put it in the food.
Reply to
Jim Thompson

anymore)

input

gives

No

guys.

degree

******************************************************************************

LTSpice.

Nope. It means that it DID find the OPerating point.

You probably don't have the .AC set up properly. I've just posted another pass. ...Jim Thompson

--
| James E.Thompson, CTO                            |    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     | 
              
I love to cook with wine.     Sometimes I even put it in the food.
Reply to
Jim Thompson

anymore)

input

gives

No

guys.

degree

******************************************************************************

LTSpice.

But no workie.

So how come other opamp model work fine with exactly the same setup?

--
Regards, Joerg 

http://www.analogconsultants.com/
Reply to
Joerg

formatting link

That's what I get with the other opamps (in my case nV/rtHz because that's what I want). I guess the model works in PSpice but for some reason it doesn't in LTSpice

--
Regards, Joerg 

http://www.analogconsultants.com/
Reply to
Joerg

formatting link

Parasitics not properly included in the faulty engine?

Reply to
SoothSayer

anymore)

in

stepping

ballpark

input

gives

a

No

hands-on guys.

degree

******************************************************************************

included

4140

LTSpice.

Hey Joerg, are you the Bear of spice ?-)

--
Thanks, 
Fred.
Reply to
Fred Bartoli

I am not sure many know just how funny that is.

Reply to
DraconisExtinctor

******************************************************************************

Ursus simulatorus? :-)

--
Regards, Joerg 

http://www.analogconsultants.com/
Reply to
Joerg

anymore)

in

stepping

ballpark

input

gives

a

No

hands-on guys.

degree

******************************************************************************

included

4140

LTSpice.

Ya got the set-up wrong. ...Jim Thompson

--
| James E.Thompson, CTO                            |    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     | 
              
I love to cook with wine.     Sometimes I even put it in the food.
Reply to
Jim Thompson

formatting link

I'm still betting there's two possibilities... pin order wrong, or .AC set-up wrong. ...Jim Thompson

--
| James E.Thompson, CTO                            |    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     | 
              
I love to cook with wine.     Sometimes I even put it in the food.
Reply to
Jim Thompson

anymore)

in

stepping

ballpark

input

gives

a
a

before. No

hands-on guys.

degree

******************************************************************************

included

4140

case,

in

LTSpice.

V1.

V2.

That doesn't explain why the other opamps work just fine.

--
Regards, Joerg 

http://www.analogconsultants.com/
Reply to
Joerg

anymore)

in

stepping

ballpark

input

gives

take a

a

before. No

hands-on guys.

degree

******************************************************************************

included

not

4140

case,

in

LTSpice.

V1.

V2.

Show me the setups... maybe the pin order is doing you in? ...Jim Thompson

--
| James E.Thompson, CTO                            |    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     | 
              
I love to cook with wine.     Sometimes I even put it in the food.
Reply to
Jim Thompson

anymore)

opamp in

stepping

ballpark

constellations, input

gives

take a

of a

before. No

hands-on guys.

degree

as

ID#

******************************************************************************

with

included

not

4140

case,

in

on

LTSpice.

rearrangement

V1.

V2.

Looks like LTspice order, for OpAmp2 symbol is...

IN+ IN- V+ V- Vout ...Jim Thompson

--
| James E.Thompson, CTO                            |    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     | 
              
I love to cook with wine.     Sometimes I even put it in the food.
Reply to
Jim Thompson

anymore)

opamp in

stepping

ballpark

constellations, input

what gives

take a

of a

before. No

hands-on guys.

one degree

as

ID#

******************************************************************************

with

included

because

not

4140

case,

10k in

on

fit LTSpice.

(Rearranged

rearrangement

V1.

V2.

not?

Hmm, the OPA model is -IN +IN V- V+ Vout.

Is that customary at TI, or in the old Burr-Brown world? If so the I should make a OpAmp2TI or something.

--
Regards, Joerg 

http://www.analogconsultants.com/
Reply to
Joerg

formatting link

Looks like pin order (the one you initially suggested as well as the one the OPA model has), thanks for the hint.

But now SWMBO wants me to start the barbecue. Pizza over charcoal, in the Weber, yummmm. With lots of Jalapenos on there. Those burn twice ...

--
Regards, Joerg 

http://www.analogconsultants.com/
Reply to
Joerg

ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.